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The design space of Kirchhoff rods. <i>ACM Transactions on Graphics</i>. 2023;42(5). doi:<a href=\"https://doi.org/10.1145/3606033\">10.1145/3606033</a>","apa":"Hafner, C., &#38; Bickel, B. (2023). The design space of Kirchhoff rods. <i>ACM Transactions on Graphics</i>. Association for Computing Machinery. <a href=\"https://doi.org/10.1145/3606033\">https://doi.org/10.1145/3606033</a>","ista":"Hafner C, Bickel B. 2023. The design space of Kirchhoff rods. ACM Transactions on Graphics. 42(5), 171.","mla":"Hafner, Christian, and Bernd Bickel. “The Design Space of Kirchhoff Rods.” <i>ACM Transactions on Graphics</i>, vol. 42, no. 5, 171, Association for Computing Machinery, 2023, doi:<a href=\"https://doi.org/10.1145/3606033\">10.1145/3606033</a>."},"month":"09","type":"journal_article","oa_version":"Submitted Version","date_updated":"2024-03-25T23:30:26Z","abstract":[{"lang":"eng","text":"The Kirchhoff rod model describes the bending and twisting of slender elastic rods in three dimensions, and has been widely studied to enable the prediction of how a rod will deform, given its geometry and boundary conditions. In this work, we study a number of inverse problems with the goal of computing the geometry of a straight rod that will automatically deform to match a curved target shape after attaching its endpoints to a support structure. Our solution lets us finely control the static equilibrium state of a rod by varying the cross-sectional profiles along its length.\r\nWe also show that the set of physically realizable equilibrium states admits a concise geometric description in terms of linear line complexes, which leads to very efficient computational design algorithms. Implemented in an interactive software tool, they allow us to convert three-dimensional hand-drawn spline curves to elastic rods, and give feedback about the feasibility and practicality of a design in real time. We demonstrate the efficacy of our method by designing and manufacturing several physical prototypes with applications to interior design and soft robotics."}],"volume":42,"date_created":"2023-07-04T07:41:30Z","file_date_updated":"2023-07-04T08:11:28Z","acknowledgement":"We thank the anonymous reviewers for their generous feedback, and Julian Fischer for his help in proving Proposition 1. This project has received funding from the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme (grant agreement No. 715767).","year":"2023","_id":"13188","publication_identifier":{"issn":["0730-0301"],"eissn":["1557-7368"]},"doi":"10.1145/3606033","quality_controlled":"1","project":[{"grant_number":"715767","name":"MATERIALIZABLE: Intelligent fabrication-oriented Computational Design and Modeling","_id":"24F9549A-B435-11E9-9278-68D0E5697425","call_identifier":"H2020"}],"keyword":["Computer Graphics","Computational Design","Computational Geometry","Shape Modeling"],"isi":1,"issue":"5","language":[{"iso":"eng"}],"author":[{"full_name":"Hafner, Christian","id":"400429CC-F248-11E8-B48F-1D18A9856A87","first_name":"Christian","last_name":"Hafner"},{"orcid":"0000-0001-6511-9385","id":"49876194-F248-11E8-B48F-1D18A9856A87","full_name":"Bickel, 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design space of Kirchhoff rods","user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","publisher":"Association for Computing Machinery","department":[{"_id":"BeBi"}],"publication":"ACM Transactions on Graphics","article_type":"original","ec_funded":1,"article_processing_charge":"No"},{"day":"01","author":[{"first_name":"Philipp","last_name":"Velicky","orcid":"0000-0002-2340-7431","id":"39BDC62C-F248-11E8-B48F-1D18A9856A87","full_name":"Velicky, Philipp"},{"full_name":"Miguel Villalba, Eder","id":"3FB91342-F248-11E8-B48F-1D18A9856A87","orcid":"0000-0001-5665-0430","first_name":"Eder","last_name":"Miguel Villalba"},{"id":"443DB6DE-F248-11E8-B48F-1D18A9856A87","orcid":"0000-0003-3862-1235","full_name":"Michalska, Julia M","last_name":"Michalska","first_name":"Julia M"},{"id":"46E28B80-F248-11E8-B48F-1D18A9856A87","full_name":"Lyudchik, Julia","last_name":"Lyudchik","first_name":"Julia"},{"first_name":"Donglai","last_name":"Wei","full_name":"Wei, Donglai"},{"last_name":"Lin","first_name":"Zudi","full_name":"Lin, Zudi"},{"first_name":"Jake","last_name":"Watson","orcid":"0000-0002-8698-3823","id":"63836096-4690-11EA-BD4E-32803DDC885E","full_name":"Watson, Jake"},{"full_name":"Troidl, Jakob","first_name":"Jakob","last_name":"Troidl"},{"full_name":"Beyer, Johanna","first_name":"Johanna","last_name":"Beyer"},{"id":"43DF3136-F248-11E8-B48F-1D18A9856A87","full_name":"Ben Simon, Yoav","first_name":"Yoav","last_name":"Ben Simon"},{"id":"4DF26D8C-F248-11E8-B48F-1D18A9856A87","orcid":"0000-0003-1216-9105","full_name":"Sommer, Christoph M","last_name":"Sommer","first_name":"Christoph M"},{"id":"425C1CE8-F248-11E8-B48F-1D18A9856A87","full_name":"Jahr, Wiebke","first_name":"Wiebke","last_name":"Jahr"},{"last_name":"Cenameri","first_name":"Alban","full_name":"Cenameri, Alban","id":"9ac8f577-2357-11eb-997a-e566c5550886"},{"full_name":"Broichhagen, Johannes","last_name":"Broichhagen","first_name":"Johannes"},{"first_name":"Seth G.N.","last_name":"Grant","full_name":"Grant, Seth G.N."},{"full_name":"Jonas, Peter M","orcid":"0000-0001-5001-4804","id":"353C1B58-F248-11E8-B48F-1D18A9856A87","first_name":"Peter M","last_name":"Jonas"},{"full_name":"Novarino, Gaia","orcid":"0000-0002-7673-7178","id":"3E57A680-F248-11E8-B48F-1D18A9856A87","last_name":"Novarino","first_name":"Gaia"},{"full_name":"Pfister, Hanspeter","first_name":"Hanspeter","last_name":"Pfister"},{"full_name":"Bickel, Bernd","id":"49876194-F248-11E8-B48F-1D18A9856A87","orcid":"0000-0001-6511-9385","first_name":"Bernd","last_name":"Bickel"},{"full_name":"Danzl, Johann G","orcid":"0000-0001-8559-3973","id":"42EFD3B6-F248-11E8-B48F-1D18A9856A87","first_name":"Johann G","last_name":"Danzl"}],"title":"Dense 4D nanoscale reconstruction of living brain tissue","department":[{"_id":"PeJo"},{"_id":"GaNo"},{"_id":"BeBi"},{"_id":"JoDa"},{"_id":"Bio"}],"pmid":1,"publisher":"Springer Nature","user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","article_type":"original","scopus_import":"1","article_processing_charge":"Yes","ec_funded":1,"publication":"Nature Methods","publication_identifier":{"eissn":["1548-7105"],"issn":["1548-7091"]},"quality_controlled":"1","doi":"10.1038/s41592-023-01936-6","project":[{"grant_number":"I03600","name":"Optical control of synaptic function via adhesion molecules","call_identifier":"FWF","_id":"265CB4D0-B435-11E9-9278-68D0E5697425"},{"_id":"2548AE96-B435-11E9-9278-68D0E5697425","call_identifier":"FWF","name":"Molecular Drug Targets","grant_number":"W1232-B24"},{"grant_number":"Z00312","name":"The Wittgenstein Prize","_id":"25C5A090-B435-11E9-9278-68D0E5697425","call_identifier":"FWF"},{"_id":"23889792-32DE-11EA-91FC-C7463DDC885E","name":"High content imaging to decode human immune cell interactions in health and allergic disease"},{"name":"International IST Doctoral Program","_id":"2564DBCA-B435-11E9-9278-68D0E5697425","call_identifier":"H2020","grant_number":"665385"},{"grant_number":"715767","name":"MATERIALIZABLE: Intelligent fabrication-oriented Computational Design and Modeling","call_identifier":"H2020","_id":"24F9549A-B435-11E9-9278-68D0E5697425"},{"_id":"25444568-B435-11E9-9278-68D0E5697425","call_identifier":"H2020","name":"Probing the Reversibility of Autism Spectrum Disorders by Employing in vivo and in vitro Models","grant_number":"715508"},{"grant_number":"692692","call_identifier":"H2020","_id":"25B7EB9E-B435-11E9-9278-68D0E5697425","name":"Biophysics and circuit function of a giant cortical glumatergic synapse"},{"name":"Synaptic computations of the hippocampal CA3 circuitry","_id":"fc2be41b-9c52-11eb-aca3-faa90aa144e9","call_identifier":"H2020","grant_number":"101026635"},{"_id":"2668BFA0-B435-11E9-9278-68D0E5697425","name":"High-speed 3D-nanoscopy to study the role of adhesion during 3D cell migration","grant_number":"LT00057"}],"language":[{"iso":"eng"}],"isi":1,"oa_version":"Published Version","month":"08","type":"journal_article","abstract":[{"text":"Three-dimensional (3D) reconstruction of living brain tissue down to an individual synapse level would create opportunities for decoding the dynamics and structure–function relationships of the brain’s complex and dense information processing network; however, this has been hindered by insufficient 3D resolution, inadequate signal-to-noise ratio and prohibitive light burden in optical imaging, whereas electron microscopy is inherently static. Here we solved these challenges by developing an integrated optical/machine-learning technology, LIONESS (live information-optimized nanoscopy enabling saturated segmentation). This leverages optical modifications to stimulated emission depletion microscopy in comprehensively, extracellularly labeled tissue and previous information on sample structure via machine learning to simultaneously achieve isotropic super-resolution, high signal-to-noise ratio and compatibility with living tissue. This allows dense deep-learning-based instance segmentation and 3D reconstruction at a synapse level, incorporating molecular, activity and morphodynamic information. LIONESS opens up avenues for studying the dynamic functional (nano-)architecture of living brain tissue.","lang":"eng"}],"date_updated":"2024-01-10T08:37:48Z","page":"1256-1265","date_created":"2023-07-23T22:01:13Z","volume":20,"year":"2023","acknowledgement":"We thank J. Vorlaufer, N. Agudelo and A. Wartak for microscope maintenance and troubleshooting, C. Kreuzinger and A. Freeman for technical assistance, M. Šuplata for hardware control support and M. Cunha dos Santos for initial exploration of software. We\r\nthank P. Henderson for advice on deep-learning training and M. Sixt, S. Boyd and T. Weiss for discussions and critical reading of the manuscript. L. Lavis (Janelia Research Campus) generously provided the JF585-HaloTag ligand. We acknowledge expert support by IST\r\nAustria’s scientific computing, imaging and optics, preclinical, library and laboratory support facilities and by the Miba machine shop. We gratefully acknowledge funding by the following sources: Austrian Science Fund (F.W.F.) grant no. I3600-B27 (J.G.D.), grant no. DK W1232\r\n(J.G.D. and J.M.M.) and grant no. Z 312-B27, Wittgenstein award (P.J.); the Gesellschaft für Forschungsförderung NÖ grant no. LSC18-022 (J.G.D.); an ISTA Interdisciplinary project grant (J.G.D. and B.B.); the European Union’s Horizon 2020 research and innovation programme,\r\nMarie-Skłodowska Curie grant 665385 (J.M.M. and J.L.); the European Union’s Horizon 2020 research and innovation programme, European Research Council grant no. 715767, MATERIALIZABLE (B.B.); grant no. 715508, REVERSEAUTISM (G.N.); grant no. 695568, SYNNOVATE (S.G.N.G.); and grant no. 692692, GIANTSYN (P.J.); the Simons\r\nFoundation Autism Research Initiative grant no. 529085 (S.G.N.G.); the Wellcome Trust Technology Development grant no. 202932 (S.G.N.G.); the Marie Skłodowska-Curie Actions Individual Fellowship no. 101026635 under the EU Horizon 2020 program (J.F.W.);\r\nthe Human Frontier Science Program postdoctoral fellowship LT000557/2018 (W.J.); and the National Science Foundation grant no. IIS-1835231 (H.P.) and NCS-FO-2124179 (H.P.).","_id":"13267","oa":1,"publication_status":"published","acknowledged_ssus":[{"_id":"ScienComp"},{"_id":"Bio"},{"_id":"PreCl"},{"_id":"E-Lib"},{"_id":"LifeSc"},{"_id":"M-Shop"}],"main_file_link":[{"url":"https://doi.org/10.1038/s41592-023-01936-6","open_access":"1"}],"date_published":"2023-08-01T00:00:00Z","external_id":{"isi":["001025621500001"],"pmid":["37429995"]},"status":"public","citation":{"apa":"Velicky, P., Miguel Villalba, E., Michalska, J. M., Lyudchik, J., Wei, D., Lin, Z., … Danzl, J. G. (2023). Dense 4D nanoscale reconstruction of living brain tissue. <i>Nature Methods</i>. Springer Nature. <a href=\"https://doi.org/10.1038/s41592-023-01936-6\">https://doi.org/10.1038/s41592-023-01936-6</a>","ista":"Velicky P, Miguel Villalba E, Michalska JM, Lyudchik J, Wei D, Lin Z, Watson J, Troidl J, Beyer J, Ben Simon Y, Sommer CM, Jahr W, Cenameri A, Broichhagen J, Grant SGN, Jonas PM, Novarino G, Pfister H, Bickel B, Danzl JG. 2023. Dense 4D nanoscale reconstruction of living brain tissue. Nature Methods. 20, 1256–1265.","mla":"Velicky, Philipp, et al. “Dense 4D Nanoscale Reconstruction of Living Brain Tissue.” <i>Nature Methods</i>, vol. 20, Springer Nature, 2023, pp. 1256–65, doi:<a href=\"https://doi.org/10.1038/s41592-023-01936-6\">10.1038/s41592-023-01936-6</a>.","ama":"Velicky P, Miguel Villalba E, Michalska JM, et al. Dense 4D nanoscale reconstruction of living brain tissue. <i>Nature Methods</i>. 2023;20:1256-1265. doi:<a href=\"https://doi.org/10.1038/s41592-023-01936-6\">10.1038/s41592-023-01936-6</a>","short":"P. Velicky, E. Miguel Villalba, J.M. Michalska, J. Lyudchik, D. Wei, Z. Lin, J. Watson, J. Troidl, J. Beyer, Y. Ben Simon, C.M. Sommer, W. Jahr, A. Cenameri, J. Broichhagen, S.G.N. Grant, P.M. Jonas, G. Novarino, H. Pfister, B. Bickel, J.G. Danzl, Nature Methods 20 (2023) 1256–1265.","chicago":"Velicky, Philipp, Eder Miguel Villalba, Julia M Michalska, Julia Lyudchik, Donglai Wei, Zudi Lin, Jake Watson, et al. “Dense 4D Nanoscale Reconstruction of Living Brain Tissue.” <i>Nature Methods</i>. Springer Nature, 2023. <a href=\"https://doi.org/10.1038/s41592-023-01936-6\">https://doi.org/10.1038/s41592-023-01936-6</a>.","ieee":"P. Velicky <i>et al.</i>, “Dense 4D nanoscale reconstruction of living brain tissue,” <i>Nature Methods</i>, vol. 20. Springer Nature, pp. 1256–1265, 2023."},"intvolume":"        20","related_material":{"link":[{"url":"https://github.com/danzllab/LIONESS","relation":"software"}],"record":[{"relation":"research_data","status":"public","id":"12817"},{"id":"14770","status":"public","relation":"shorter_version"}]}},{"department":[{"_id":"GradSch"},{"_id":"BeBi"}],"user_id":"400429CC-F248-11E8-B48F-1D18A9856A87","publisher":"Institute of Science and Technology Austria","article_processing_charge":"No","ec_funded":1,"file":[{"date_created":"2023-05-11T10:43:20Z","access_level":"open_access","date_updated":"2023-12-08T23:30:04Z","file_id":"12942","checksum":"cc2094e92fa27000b70eb4bfb76d6b5a","relation":"main_file","embargo":"2023-12-07","content_type":"application/pdf","file_size":50714445,"creator":"chafner","file_name":"thesis-hafner-2023may11-a2b.pdf"},{"embargo_to":"open_access","creator":"chafner","file_size":265319,"content_type":"application/pdf","relation":"source_file","file_name":"thesis-release-form.pdf","access_level":"closed","date_created":"2023-05-11T10:43:44Z","checksum":"a6b51334be2b81672357b1549afab40c","file_id":"12943","date_updated":"2023-12-08T23:30:04Z"}],"day":"05","author":[{"last_name":"Hafner","first_name":"Christian","full_name":"Hafner, Christian","id":"400429CC-F248-11E8-B48F-1D18A9856A87"}],"degree_awarded":"PhD","title":"Inverse shape design with parametric representations: Kirchhoff Rods and parametric surface models","project":[{"_id":"24F9549A-B435-11E9-9278-68D0E5697425","call_identifier":"H2020","name":"MATERIALIZABLE: Intelligent fabrication-oriented Computational Design and Modeling","grant_number":"715767"}],"language":[{"iso":"eng"}],"publication_identifier":{"issn":["2663-337X"],"isbn":["978-3-99078-031-2"]},"doi":"10.15479/at:ista:12897","year":"2023","_id":"12897","type":"dissertation","month":"05","oa_version":"Published Version","date_updated":"2024-01-29T10:47:51Z","abstract":[{"lang":"eng","text":"Inverse design problems in fabrication-aware shape optimization are typically solved on discrete representations such as polygonal meshes. This thesis argues that there are benefits to treating these problems in the same domain as human designers, namely, the parametric one. One reason is that discretizing a parametric model usually removes the capability of making further manual changes to the design, because the human intent is captured by the shape parameters. Beyond this, knowledge about a design problem can sometimes reveal a structure that is present in a smooth representation, but is fundamentally altered by discretizing. In this case, working in the parametric domain may even simplify the optimization task. We present two lines of research that explore both of these aspects of fabrication-aware shape optimization on parametric representations.\r\n\r\nThe first project studies the design of plane elastic curves and Kirchhoff rods, which are common mathematical models for describing the deformation of thin elastic rods such as beams, ribbons, cables, and hair. Our main contribution is a characterization of all curved shapes that can be attained by bending and twisting elastic rods having a stiffness that is allowed to vary across the length. Elements like these can be manufactured using digital fabrication devices such as 3d printers and digital cutters, and have applications in free-form architecture and soft robotics.\r\n\r\nWe show that the family of curved shapes that can be produced this way admits geometric description that is concise and computationally convenient. In the case of plane curves, the geometric description is intuitive enough to allow a designer to determine whether a curved shape is physically achievable by visual inspection alone. We also present shape optimization algorithms that convert a user-defined curve in the plane or in three dimensions into the geometry of an elastic rod that will naturally deform to follow this curve when its endpoints are attached to a support structure. Implemented in an interactive software design tool, the rod geometry is generated in real time as the user edits a curve and enables fast prototyping. \r\n\r\nThe second project tackles the problem of general-purpose shape optimization on CAD models using a novel variant of the extended finite element method (XFEM). Our goal is the decoupling between the simulation mesh and the CAD model, so no geometry-dependent meshing or remeshing needs to be performed when the CAD parameters change during optimization. This is achieved by discretizing the embedding space of the CAD model, and using a new high-accuracy numerical integration method to enable XFEM on free-form elements bounded by the parametric surface patches of the model. Our simulation is differentiable from the CAD parameters to the simulation output, which enables us to use off-the-shelf gradient-based optimization procedures. The result is a method that fits seamlessly into the CAD workflow because it works on the same representation as the designer, enabling the alternation of manual editing and fabrication-aware optimization at will."}],"page":"180","file_date_updated":"2023-12-08T23:30:04Z","date_created":"2023-05-05T10:40:14Z","status":"public","alternative_title":["ISTA Thesis"],"citation":{"ama":"Hafner C. Inverse shape design with parametric representations: Kirchhoff Rods and parametric surface models. 2023. doi:<a href=\"https://doi.org/10.15479/at:ista:12897\">10.15479/at:ista:12897</a>","apa":"Hafner, C. (2023). <i>Inverse shape design with parametric representations: Kirchhoff Rods and parametric surface models</i>. Institute of Science and Technology Austria. <a href=\"https://doi.org/10.15479/at:ista:12897\">https://doi.org/10.15479/at:ista:12897</a>","mla":"Hafner, Christian. <i>Inverse Shape Design with Parametric Representations: Kirchhoff Rods and Parametric Surface Models</i>. Institute of Science and Technology Austria, 2023, doi:<a href=\"https://doi.org/10.15479/at:ista:12897\">10.15479/at:ista:12897</a>.","ista":"Hafner C. 2023. Inverse shape design with parametric representations: Kirchhoff Rods and parametric surface models. Institute of Science and Technology Austria.","chicago":"Hafner, Christian. “Inverse Shape Design with Parametric Representations: Kirchhoff Rods and Parametric Surface Models.” Institute of Science and Technology Austria, 2023. <a href=\"https://doi.org/10.15479/at:ista:12897\">https://doi.org/10.15479/at:ista:12897</a>.","ieee":"C. Hafner, “Inverse shape design with parametric representations: Kirchhoff Rods and parametric surface models,” Institute of Science and Technology Austria, 2023.","short":"C. Hafner, Inverse Shape Design with Parametric Representations: Kirchhoff Rods and Parametric Surface Models, Institute of Science and Technology Austria, 2023."},"related_material":{"record":[{"relation":"part_of_dissertation","status":"public","id":"9817"},{"id":"7117","status":"public","relation":"part_of_dissertation"},{"id":"13188","status":"public","relation":"dissertation_contains"}]},"has_accepted_license":"1","publication_status":"published","oa":1,"acknowledged_ssus":[{"_id":"M-Shop"}],"date_published":"2023-05-05T00:00:00Z","ddc":["516","004","518","531"],"supervisor":[{"full_name":"Bickel, Bernd","orcid":"0000-0001-6511-9385","id":"49876194-F248-11E8-B48F-1D18A9856A87","first_name":"Bernd","last_name":"Bickel"}]},{"external_id":{"isi":["001000062600033"]},"status":"public","citation":{"ieee":"Z. Liu, M. Piovarci, C. Hafner, R. Charrondiere, and B. Bickel, “Directionality-aware design of embroidery patterns,” <i>Computer Graphics Forum</i>, vol. 42, no. 2. Wiley, pp. 397–409, 2023.","chicago":"Liu, Zhenyuan, Michael Piovarci, Christian Hafner, Raphael Charrondiere, and Bernd Bickel. “Directionality-Aware Design of Embroidery Patterns.” <i>Computer Graphics Forum</i>. Wiley, 2023. <a href=\"https://doi.org/10.1111/cgf.14770 \">https://doi.org/10.1111/cgf.14770 </a>.","short":"Z. Liu, M. Piovarci, C. Hafner, R. Charrondiere, B. Bickel, Computer Graphics Forum 42 (2023) 397–409.","ama":"Liu Z, Piovarci M, Hafner C, Charrondiere R, Bickel B. Directionality-aware design of embroidery patterns. <i>Computer Graphics Forum</i>. 2023;42(2):397-409. doi:<a href=\"https://doi.org/10.1111/cgf.14770 \">10.1111/cgf.14770 </a>","mla":"Liu, Zhenyuan, et al. “Directionality-Aware Design of Embroidery Patterns.” <i>Computer Graphics Forum</i>, vol. 42, no. 2, Wiley, 2023, pp. 397–409, doi:<a href=\"https://doi.org/10.1111/cgf.14770 \">10.1111/cgf.14770 </a>.","ista":"Liu Z, Piovarci M, Hafner C, Charrondiere R, Bickel B. 2023. Directionality-aware design of embroidery patterns. Computer Graphics Forum. 42(2), 397–409.","apa":"Liu, Z., Piovarci, M., Hafner, C., Charrondiere, R., &#38; Bickel, B. (2023). Directionality-aware design of embroidery patterns. <i>Computer Graphics Forum</i>. Saarbrucken, Germany: Wiley. <a href=\"https://doi.org/10.1111/cgf.14770 \">https://doi.org/10.1111/cgf.14770 </a>"},"intvolume":"        42","has_accepted_license":"1","oa":1,"publication_status":"published","date_published":"2023-05-08T00:00:00Z","ddc":["004"],"year":"2023","acknowledgement":"This work was supported by the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation program (grant agreement No 715767 – MATERIALIZABLE), and FWF Lise Meitner (Grant M 3319). We thank the anonymous reviewers for their insightful feedback; Solal Pirelli, Shardul Chiplunkar, and Paola Mejia for proofreading; everyone in the visual computing group at ISTA for inspiring lunch and coffee breaks; Thibault Tricard for help producing the results of Phasor Noise.","_id":"12972","oa_version":"Published Version","type":"journal_article","month":"05","abstract":[{"lang":"eng","text":"Embroidery is a long-standing and high-quality approach to making logos and images on textiles. Nowadays, it can also be performed via automated machines that weave threads with high spatial accuracy. A characteristic feature of the appearance of the threads is a high degree of anisotropy. The anisotropic behavior is caused by depositing thin but long strings of thread. As a result, the stitched patterns convey both color and direction. Artists leverage this anisotropic behavior to enhance pure color images with textures, illusions of motion, or depth cues. However, designing colorful embroidery patterns with prescribed directionality is a challenging task, one usually requiring an expert designer. In this work, we propose an interactive algorithm that generates machine-fabricable embroidery patterns from multi-chromatic images equipped with user-specified directionality fields.We cast the problem of finding a stitching pattern into vector theory. To find a suitable stitching pattern, we extract sources and sinks from the divergence field of the vector field extracted from the input and use them to trace streamlines. We further optimize the streamlines to guarantee a smooth and connected stitching pattern. The generated patterns approximate the color distribution constrained by the directionality field. To allow for further artistic control, the trade-off between color match and directionality match can be interactively explored via an intuitive slider. We showcase our approach by fabricating several embroidery paths."}],"date_updated":"2023-08-01T14:47:05Z","page":"397-409","file_date_updated":"2023-05-16T08:28:37Z","date_created":"2023-05-16T08:47:25Z","volume":42,"project":[{"_id":"eb901961-77a9-11ec-83b8-f5c883a62027","name":"Perception-Aware Appearance Fabrication","grant_number":"M03319"},{"grant_number":"715767","_id":"24F9549A-B435-11E9-9278-68D0E5697425","call_identifier":"H2020","name":"MATERIALIZABLE: Intelligent fabrication-oriented Computational Design and Modeling"}],"issue":"2","language":[{"iso":"eng"}],"keyword":["embroidery","design","directionality","density","image"],"conference":{"end_date":"2023-05-12","name":"EG: Eurographics","location":"Saarbrucken, Germany","start_date":"2023-05-08"},"isi":1,"publication_identifier":{"issn":["1467-8659"]},"quality_controlled":"1","doi":"10.1111/cgf.14770 ","department":[{"_id":"BeBi"}],"user_id":"4359f0d1-fa6c-11eb-b949-802e58b17ae8","publisher":"Wiley","tmp":{"name":"Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0)","short":"CC BY-NC-ND (4.0)","image":"/images/cc_by_nc_nd.png","legal_code_url":"https://creativecommons.org/licenses/by-nc-nd/4.0/legalcode"},"article_type":"original","article_processing_charge":"No","ec_funded":1,"publication":"Computer Graphics Forum","day":"08","file":[{"content_type":"application/pdf","relation":"main_file","file_size":24003702,"creator":"mpiovarc","success":1,"file_name":"Zhenyuan2023.pdf","date_created":"2023-05-16T08:28:37Z","access_level":"open_access","date_updated":"2023-05-16T08:28:37Z","file_id":"12974","checksum":"4c188c2be4745467a8790bbf5d6491aa"}],"author":[{"full_name":"Liu, Zhenyuan","orcid":"0000-0001-9200-5690","id":"70f0d7cf-ae65-11ec-a14f-89dfc5505b19","last_name":"Liu","first_name":"Zhenyuan"},{"first_name":"Michael","last_name":"Piovarci","full_name":"Piovarci, Michael","id":"62E473F4-5C99-11EA-A40E-AF823DDC885E"},{"last_name":"Hafner","first_name":"Christian","full_name":"Hafner, Christian","id":"400429CC-F248-11E8-B48F-1D18A9856A87"},{"full_name":"Charrondiere, Raphael","id":"a3a24133-2cc7-11ec-be88-8ddaf6f464b1","last_name":"Charrondiere","first_name":"Raphael"},{"first_name":"Bernd","last_name":"Bickel","full_name":"Bickel, Bernd","orcid":"0000-0001-6511-9385","id":"49876194-F248-11E8-B48F-1D18A9856A87"}],"title":"Directionality-aware design of embroidery patterns"},{"file_date_updated":"2023-06-20T12:20:51Z","date_created":"2023-05-22T08:37:04Z","volume":42,"abstract":[{"text":"We propose a computational design approach for covering a surface with individually addressable RGB LEDs, effectively forming a low-resolution surface screen. To achieve a low-cost and scalable approach, we propose creating designs from flat PCB panels bent in-place along the surface of a 3D printed core. Working with standard rigid PCBs enables the use of\r\nestablished PCB manufacturing services, allowing the fabrication of designs with several hundred LEDs. \r\nOur approach optimizes the PCB geometry for folding, and then jointly optimizes the LED packing, circuit and routing, solving a challenging layout problem under strict manufacturing requirements. Unlike paper, PCBs cannot bend beyond a certain point without breaking. Therefore, we introduce parametric cut patterns acting as hinges, designed to allow bending while remaining compact. To tackle the joint optimization of placement, circuit and routing, we propose a specialized algorithm that splits the global problem into one sub-problem per triangle, which is then individually solved.\r\nOur technique generates PCB blueprints in a completely automated way. After being fabricated by a PCB manufacturing service, the boards are bent and glued by the user onto the 3D printed support. We demonstrate our technique on a range of physical models and virtual examples, creating intricate surface light patterns from hundreds of LEDs.","lang":"eng"}],"date_updated":"2024-01-29T10:30:49Z","month":"07","type":"journal_article","oa_version":"Submitted Version","_id":"13049","year":"2023","acknowledgement":"We thank the reviewers for the valuable feedback. We also thank the Miba Machine Shop at ISTA, PCBWay, and PragoBoard for helping us with fabrication and assembly. This project was supported by the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation program (Grant Agreement No. 715767 – MATERIALIZABLE).","acknowledged_ssus":[{"_id":"M-Shop"}],"date_published":"2023-07-26T00:00:00Z","ddc":["006"],"has_accepted_license":"1","publication_status":"published","oa":1,"citation":{"ama":"Freire M, Bhargava M, Schreck C, Hugron P-A, Bickel B, Lefebvre S. PCBend: Light up your 3D shapes with foldable circuit boards. <i>Transactions on Graphics</i>. 2023;42(4). doi:<a href=\"https://doi.org/10.1145/3592411\">10.1145/3592411</a>","mla":"Freire, Marco, et al. “PCBend: Light up Your 3D Shapes with Foldable Circuit Boards.” <i>Transactions on Graphics</i>, vol. 42, no. 4, 142, Association for Computing Machinery, 2023, doi:<a href=\"https://doi.org/10.1145/3592411\">10.1145/3592411</a>.","ista":"Freire M, Bhargava M, Schreck C, Hugron P-A, Bickel B, Lefebvre S. 2023. PCBend: Light up your 3D shapes with foldable circuit boards. Transactions on Graphics. 42(4), 142.","apa":"Freire, M., Bhargava, M., Schreck, C., Hugron, P.-A., Bickel, B., &#38; Lefebvre, S. (2023). PCBend: Light up your 3D shapes with foldable circuit boards. <i>Transactions on Graphics</i>. Los Angeles, CA, United States: Association for Computing Machinery. <a href=\"https://doi.org/10.1145/3592411\">https://doi.org/10.1145/3592411</a>","ieee":"M. Freire, M. Bhargava, C. Schreck, P.-A. Hugron, B. Bickel, and S. Lefebvre, “PCBend: Light up your 3D shapes with foldable circuit boards,” <i>Transactions on Graphics</i>, vol. 42, no. 4. Association for Computing Machinery, 2023.","chicago":"Freire, Marco, Manas Bhargava, Camille Schreck, Pierre-Alexandre Hugron, Bernd Bickel, and Sylvain Lefebvre. “PCBend: Light up Your 3D Shapes with Foldable Circuit Boards.” <i>Transactions on Graphics</i>. Association for Computing Machinery, 2023. <a href=\"https://doi.org/10.1145/3592411\">https://doi.org/10.1145/3592411</a>.","short":"M. Freire, M. Bhargava, C. Schreck, P.-A. Hugron, B. Bickel, S. Lefebvre, Transactions on Graphics 42 (2023)."},"intvolume":"        42","external_id":{"isi":["001044671300108"]},"status":"public","title":"PCBend: Light up your 3D shapes with foldable circuit boards","article_number":"142","file":[{"date_created":"2023-06-19T11:02:23Z","access_level":"open_access","date_updated":"2023-06-19T11:02:23Z","file_id":"13156","checksum":"a0b0ba3b36f43a94388e8824613d812a","content_type":"application/pdf","relation":"main_file","file_size":78940724,"creator":"dernst","success":1,"file_name":"2023_ACMToG_Freire.pdf"},{"date_created":"2023-06-20T12:20:51Z","access_level":"open_access","date_updated":"2023-06-20T12:20:51Z","file_id":"13157","checksum":"b9206bbb67af82df49b7e7cdbde3410c","relation":"main_file","content_type":"application/pdf","file_size":34345905,"creator":"dernst","success":1,"file_name":"2023_ACMToG_SuppMaterial_Freire.pdf"}],"day":"26","author":[{"last_name":"Freire","first_name":"Marco","full_name":"Freire, Marco"},{"last_name":"Bhargava","first_name":"Manas","orcid":"0009-0007-6138-6890","id":"FF8FA64C-AA6A-11E9-99AD-50D4E5697425","full_name":"Bhargava, Manas"},{"full_name":"Schreck, Camille","id":"2B14B676-F248-11E8-B48F-1D18A9856A87","last_name":"Schreck","first_name":"Camille"},{"last_name":"Hugron","first_name":"Pierre-Alexandre","full_name":"Hugron, Pierre-Alexandre"},{"full_name":"Bickel, Bernd","orcid":"0000-0001-6511-9385","id":"49876194-F248-11E8-B48F-1D18A9856A87","last_name":"Bickel","first_name":"Bernd"},{"full_name":"Lefebvre, Sylvain","last_name":"Lefebvre","first_name":"Sylvain"}],"ec_funded":1,"article_processing_charge":"No","article_type":"original","publication":"Transactions on Graphics","department":[{"_id":"GradSch"},{"_id":"BeBi"}],"user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","publisher":"Association for Computing Machinery","quality_controlled":"1","doi":"10.1145/3592411","publication_identifier":{"issn":["0730-0301"],"eissn":["1557-7368"]},"language":[{"iso":"eng"}],"issue":"4","isi":1,"conference":{"end_date":"2023-08-10","start_date":"2023-08-06","name":"SIGGRAPH: Computer Graphics and Interactive Techniques Conference","location":"Los Angeles, CA, United States"},"keyword":["PCB design and layout","Mesh geometry models"],"project":[{"call_identifier":"H2020","_id":"24F9549A-B435-11E9-9278-68D0E5697425","name":"MATERIALIZABLE: Intelligent fabrication-oriented Computational Design and Modeling","grant_number":"715767"}]},{"issue":"2","language":[{"iso":"eng"}],"isi":1,"project":[{"_id":"24F9549A-B435-11E9-9278-68D0E5697425","call_identifier":"H2020","name":"MATERIALIZABLE: Intelligent fabrication-oriented Computational Design and Modeling","grant_number":"715767"}],"quality_controlled":"1","doi":"10.1111/cgf.14490","publication_identifier":{"issn":["0167-7055"],"eissn":["1467-8659"]},"article_type":"original","scopus_import":"1","ec_funded":1,"article_processing_charge":"No","publication":"Computer Graphics Forum","department":[{"_id":"BeBi"}],"user_id":"4359f0d1-fa6c-11eb-b949-802e58b17ae8","publisher":"Wiley","title":"Worst-case rigidity analysis and optimization for assemblies with mechanical joints","day":"01","file":[{"file_name":"paper.pdf","file_size":19601689,"content_type":"application/pdf","relation":"main_file","creator":"bbickel","file_id":"10923","date_updated":"2022-03-27T17:34:11Z","checksum":"b62188b07f5c000f1638c782ec92da41","date_created":"2022-03-27T17:34:11Z","access_level":"open_access"}],"author":[{"last_name":"Liu","first_name":"Zhenyuan","orcid":"0000-0001-9200-5690","id":"70f0d7cf-ae65-11ec-a14f-89dfc5505b19","full_name":"Liu, Zhenyuan"},{"last_name":"Hu","first_name":"Jingyu","full_name":"Hu, Jingyu"},{"full_name":"Xu, Hao","first_name":"Hao","last_name":"Xu"},{"first_name":"Peng","last_name":"Song","full_name":"Song, Peng"},{"first_name":"Ran","last_name":"Zhang","full_name":"Zhang, Ran"},{"id":"49876194-F248-11E8-B48F-1D18A9856A87","orcid":"0000-0001-6511-9385","full_name":"Bickel, Bernd","first_name":"Bernd","last_name":"Bickel"},{"last_name":"Fu","first_name":"Chi-Wing","full_name":"Fu, Chi-Wing"}],"citation":{"chicago":"Liu, Zhenyuan, Jingyu Hu, Hao Xu, Peng Song, Ran Zhang, Bernd Bickel, and Chi-Wing Fu. “Worst-Case Rigidity Analysis and Optimization for Assemblies with Mechanical Joints.” <i>Computer Graphics Forum</i>. Wiley, 2022. <a href=\"https://doi.org/10.1111/cgf.14490\">https://doi.org/10.1111/cgf.14490</a>.","ieee":"Z. Liu <i>et al.</i>, “Worst-case rigidity analysis and optimization for assemblies with mechanical joints,” <i>Computer Graphics Forum</i>, vol. 41, no. 2. Wiley, pp. 507–519, 2022.","short":"Z. Liu, J. Hu, H. Xu, P. Song, R. Zhang, B. Bickel, C.-W. Fu, Computer Graphics Forum 41 (2022) 507–519.","ama":"Liu Z, Hu J, Xu H, et al. Worst-case rigidity analysis and optimization for assemblies with mechanical joints. <i>Computer Graphics Forum</i>. 2022;41(2):507-519. doi:<a href=\"https://doi.org/10.1111/cgf.14490\">10.1111/cgf.14490</a>","apa":"Liu, Z., Hu, J., Xu, H., Song, P., Zhang, R., Bickel, B., &#38; Fu, C.-W. (2022). Worst-case rigidity analysis and optimization for assemblies with mechanical joints. <i>Computer Graphics Forum</i>. Wiley. <a href=\"https://doi.org/10.1111/cgf.14490\">https://doi.org/10.1111/cgf.14490</a>","ista":"Liu Z, Hu J, Xu H, Song P, Zhang R, Bickel B, Fu C-W. 2022. Worst-case rigidity analysis and optimization for assemblies with mechanical joints. Computer Graphics Forum. 41(2), 507–519.","mla":"Liu, Zhenyuan, et al. “Worst-Case Rigidity Analysis and Optimization for Assemblies with Mechanical Joints.” <i>Computer Graphics Forum</i>, vol. 41, no. 2, Wiley, 2022, pp. 507–19, doi:<a href=\"https://doi.org/10.1111/cgf.14490\">10.1111/cgf.14490</a>."},"intvolume":"        41","status":"public","external_id":{"isi":["000802723900039"]},"acknowledged_ssus":[{"_id":"M-Shop"}],"date_published":"2022-05-01T00:00:00Z","ddc":["000"],"has_accepted_license":"1","oa":1,"publication_status":"published","_id":"10922","year":"2022","acknowledgement":"This work was supported by the Research Grants Council of the Hong Kong Special Administrative Region, China [Project No.: CUHK 14201921] and the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme (grant agreement No 715767 – MATERIALIZABLE). We thank the anonymous reviewers for their insightful feedback; Christian Hafner for proofreading and discussions; Ziqi Wang,\r\nHaisen Zhao, and Martin Hafskjold Thoresen for the helpful discussions; and the Miba Machine Shop at IST Austria for 3D printing the BUNNY and BOOMERANG models.","file_date_updated":"2022-03-27T17:34:11Z","date_created":"2022-03-27T17:34:17Z","volume":41,"type":"journal_article","month":"05","oa_version":"Submitted Version","date_updated":"2023-08-03T06:17:13Z","abstract":[{"lang":"eng","text":"We study structural rigidity for assemblies with mechanical joints. Existing methods identify whether an assembly is structurally rigid by assuming parts are perfectly rigid. Yet, an assembly identified as rigid may not be that “rigid” in practice, and existing methods cannot quantify how rigid an assembly is. We address this limitation by developing a new measure, worst-case rigidity, to quantify the rigidity of an assembly as the largest possible deformation that the assembly undergoes for arbitrary external loads of fixed magnitude. Computing worst-case rigidity is non-trivial due to non-rigid parts and different joint types. We thus formulate a new computational approach by encoding parts and their connections into a stiffness matrix, in which parts are modeled as deformable objects and joints as soft constraints. Based on this, we formulate worst-case rigidity analysis as an optimization that seeks the worst-case deformation of an assembly for arbitrary external loads, and solve the optimization problem via an eigenanalysis. Furthermore, we present methods to optimize the geometry and topology of various assemblies to enhance their rigidity, as guided by our rigidity measure. In the end, we validate our method on a variety of assembly structures with physical experiments and demonstrate its effectiveness by designing and fabricating several structurally rigid assemblies."}],"page":"507-519"},{"publication_status":"published","oa":1,"has_accepted_license":"1","date_published":"2022-06-01T00:00:00Z","ddc":["000"],"external_id":{"arxiv":["2201.11819"]},"status":"public","related_material":{"link":[{"description":"News on ISTA website","url":"https://ista.ac.at/en/news/machine-learning-3d-printing-fluids/","relation":"press_release"}]},"intvolume":"        41","citation":{"ista":"Piovarci M, Foshey M, Xu J, Erps T, Babaei V, Didyk P, Rusinkiewicz S, Matusik W, Bickel B. 2022. Closed-loop control of direct ink writing via reinforcement learning. ACM Transactions on Graphics. 41(4), 112.","mla":"Piovarci, Michael, et al. “Closed-Loop Control of Direct Ink Writing via Reinforcement Learning.” <i>ACM Transactions on Graphics</i>, vol. 41, no. 4, 112, Association for Computing Machinery, 2022, doi:<a href=\"https://doi.org/10.1145/3528223.3530144\">10.1145/3528223.3530144</a>.","apa":"Piovarci, M., Foshey, M., Xu, J., Erps, T., Babaei, V., Didyk, P., … Bickel, B. (2022). Closed-loop control of direct ink writing via reinforcement learning. <i>ACM Transactions on Graphics</i>. Association for Computing Machinery. <a href=\"https://doi.org/10.1145/3528223.3530144\">https://doi.org/10.1145/3528223.3530144</a>","ama":"Piovarci M, Foshey M, Xu J, et al. Closed-loop control of direct ink writing via reinforcement learning. <i>ACM Transactions on Graphics</i>. 2022;41(4). doi:<a href=\"https://doi.org/10.1145/3528223.3530144\">10.1145/3528223.3530144</a>","short":"M. Piovarci, M. Foshey, J. Xu, T. Erps, V. Babaei, P. Didyk, S. Rusinkiewicz, W. Matusik, B. Bickel, ACM Transactions on Graphics 41 (2022).","ieee":"M. Piovarci <i>et al.</i>, “Closed-loop control of direct ink writing via reinforcement learning,” <i>ACM Transactions on Graphics</i>, vol. 41, no. 4. Association for Computing Machinery, 2022.","chicago":"Piovarci, Michael, Michael Foshey, Jie Xu, Timothy Erps, Vahid Babaei, Piotr Didyk, Szymon Rusinkiewicz, Wojciech Matusik, and Bernd Bickel. “Closed-Loop Control of Direct Ink Writing via Reinforcement Learning.” <i>ACM Transactions on Graphics</i>. Association for Computing Machinery, 2022. <a href=\"https://doi.org/10.1145/3528223.3530144\">https://doi.org/10.1145/3528223.3530144</a>."},"type":"journal_article","month":"06","oa_version":"Submitted Version","date_updated":"2023-05-31T12:38:21Z","abstract":[{"text":"Enabling additive manufacturing to employ a wide range of novel, functional materials can be a major boost to this technology. However, making such materials printable requires painstaking trial-and-error by an expert operator,\r\nas they typically tend to exhibit peculiar rheological or hysteresis properties. Even in the case of successfully finding the process parameters, there is no guarantee of print-to-print consistency due to material differences between batches. These challenges make closed-loop feedback an attractive option where the process parameters are adjusted on-the-fly. There are several challenges for designing an efficient controller: the deposition parameters are complex and highly coupled, artifacts occur after long time horizons, simulating the deposition is computationally costly, and learning on hardware is intractable. In this work, we demonstrate the feasibility of learning a closed-loop control policy for additive manufacturing using reinforcement learning. We show that approximate, but efficient, numerical simulation is\r\nsufficient as long as it allows learning the behavioral patterns of deposition that translate to real-world experiences. In combination with reinforcement learning, our model can be used to discover control policies that outperform\r\nbaseline controllers. Furthermore, the recovered policies have a minimal sim-to-real gap. We showcase this by applying our control policy in-vivo on a single-layer, direct ink writing printer. ","lang":"eng"}],"volume":41,"file_date_updated":"2022-06-28T08:32:58Z","date_created":"2022-06-10T06:41:47Z","acknowledgement":"This work is graciously supported by the following grant agencies: FWF Lise Meitner (Grant M 3319), SNSF (Grant 200502), ERC Starting Grant (MATERIALIZABLE-715767), NSF (Grant IIS-181507).\r\n","year":"2022","_id":"11442","publication_identifier":{"issn":["0730-0301"],"eissn":["1557-7368"]},"doi":"10.1145/3528223.3530144","quality_controlled":"1","project":[{"name":"Perception-Aware Appearance Fabrication","_id":"eb901961-77a9-11ec-83b8-f5c883a62027","grant_number":"M03319"},{"grant_number":"715767","_id":"24F9549A-B435-11E9-9278-68D0E5697425","call_identifier":"H2020","name":"MATERIALIZABLE: Intelligent fabrication-oriented Computational Design and Modeling"}],"issue":"4","language":[{"iso":"eng"}],"author":[{"id":"62E473F4-5C99-11EA-A40E-AF823DDC885E","full_name":"Piovarci, Michael","last_name":"Piovarci","first_name":"Michael"},{"first_name":"Michael","last_name":"Foshey","full_name":"Foshey, Michael"},{"full_name":"Xu, Jie","last_name":"Xu","first_name":"Jie"},{"full_name":"Erps, Timothy","last_name":"Erps","first_name":"Timothy"},{"last_name":"Babaei","first_name":"Vahid","full_name":"Babaei, Vahid"},{"full_name":"Didyk, Piotr","last_name":"Didyk","first_name":"Piotr"},{"full_name":"Rusinkiewicz, Szymon","last_name":"Rusinkiewicz","first_name":"Szymon"},{"full_name":"Matusik, Wojciech","first_name":"Wojciech","last_name":"Matusik"},{"full_name":"Bickel, Bernd","orcid":"0000-0001-6511-9385","id":"49876194-F248-11E8-B48F-1D18A9856A87","last_name":"Bickel","first_name":"Bernd"}],"file":[{"file_size":33994829,"content_type":"application/pdf","relation":"main_file","creator":"dernst","file_name":"2022_ACM_acceptedversion_Piovarci.pdf","success":1,"date_created":"2022-06-28T08:32:58Z","access_level":"open_access","file_id":"11467","date_updated":"2022-06-28T08:32:58Z","checksum":"27f6fe41c6ff84d50445cc9b0176d45b"}],"day":"01","article_number":"112","arxiv":1,"title":"Closed-loop control of direct ink writing via reinforcement learning","user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","publisher":"Association for Computing Machinery","department":[{"_id":"BeBi"}],"publication":"ACM Transactions on Graphics","tmp":{"legal_code_url":"https://creativecommons.org/licenses/by/4.0/legalcode","image":"/images/cc_by.png","name":"Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)","short":"CC BY (4.0)"},"article_type":"original","article_processing_charge":"No","ec_funded":1},{"day":"22","file":[{"creator":"bbickel","content_type":"application/pdf","relation":"main_file","file_size":16896871,"success":1,"file_name":"Chen-2022-High-LevelPuzzle_authorVersion.pdf","access_level":"open_access","date_created":"2022-08-28T07:56:19Z","checksum":"0b51651be45b1b33f2072bd5d2686c69","date_updated":"2022-08-28T07:56:19Z","file_id":"11992"}],"author":[{"first_name":"Rulin","last_name":"Chen","full_name":"Chen, Rulin"},{"first_name":"Ziqi","last_name":"Wang","full_name":"Wang, Ziqi"},{"full_name":"Song, Peng","last_name":"Song","first_name":"Peng"},{"id":"49876194-F248-11E8-B48F-1D18A9856A87","orcid":"0000-0001-6511-9385","full_name":"Bickel, Bernd","first_name":"Bernd","last_name":"Bickel"}],"article_number":"150","title":"Computational design of high-level interlocking puzzles","department":[{"_id":"BeBi"}],"publisher":"Association for Computing Machinery","user_id":"4359f0d1-fa6c-11eb-b949-802e58b17ae8","article_type":"original","ec_funded":1,"article_processing_charge":"No","scopus_import":"1","publication":"ACM Transactions on Graphics","publication_identifier":{"eissn":["1557-7368"],"issn":["0730-0301"]},"quality_controlled":"1","doi":"10.1145/3528223.3530071","project":[{"name":"MATERIALIZABLE: Intelligent fabrication-oriented Computational Design and Modeling","call_identifier":"H2020","_id":"24F9549A-B435-11E9-9278-68D0E5697425","grant_number":"715767"}],"issue":"4","language":[{"iso":"eng"}],"isi":1,"month":"07","type":"journal_article","oa_version":"Submitted Version","abstract":[{"text":"Interlocking puzzles are intriguing geometric games where the puzzle pieces are held together based on their geometric arrangement, preventing the puzzle from falling apart. High-level-of-difficulty, or simply high-level, interlocking puzzles are a subclass of interlocking puzzles that require multiple moves to take out the first subassembly from the puzzle. Solving a high-level interlocking puzzle is a challenging task since one has to explore many different configurations of the puzzle pieces until reaching a configuration where the first subassembly can be taken out. Designing a high-level interlocking puzzle with a user-specified level of difficulty is even harder since the puzzle pieces have to be interlocking in all the configurations before the first subassembly is taken out.\r\n\r\nIn this paper, we present a computational approach to design high-level interlocking puzzles. The core idea is to represent all possible configurations of an interlocking puzzle as well as transitions among these configurations using a rooted, undirected graph called a disassembly graph and leverage this graph to find a disassembly plan that requires a minimal number of moves to take out the first subassembly from the puzzle. At the design stage, our algorithm iteratively constructs the geometry of each puzzle piece to expand the disassembly graph incrementally, aiming to achieve a user-specified level of difficulty. We show that our approach allows efficient generation of high-level interlocking puzzles of various shape complexities, including new solutions not attainable by state-of-the-art approaches.","lang":"eng"}],"date_updated":"2023-08-03T13:21:22Z","date_created":"2022-08-07T22:01:57Z","file_date_updated":"2022-08-28T07:56:19Z","volume":41,"year":"2022","acknowledgement":"We thank the reviewers for the valuable comments, David Gontier for sharing the source code of the baseline design approach, Christian Hafner for proofreading the paper, Keenan Crane for the 3D model of Cow, and Thingiverse for the 3D models of Moai and Owl. This work was supported by the SUTD Start-up Research Grant (Number: SRG ISTD 2019 148), the Swiss National Science Foundation (NCCR Digital Fabrication Agreement #51NF40-141853), and\r\nthe European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme (Grant Agreement No 715767 – MATERIALIZABLE).","_id":"11735","has_accepted_license":"1","oa":1,"publication_status":"published","ddc":["000"],"date_published":"2022-07-22T00:00:00Z","status":"public","external_id":{"isi":["000830989200018"]},"citation":{"ama":"Chen R, Wang Z, Song P, Bickel B. Computational design of high-level interlocking puzzles. <i>ACM Transactions on Graphics</i>. 2022;41(4). doi:<a href=\"https://doi.org/10.1145/3528223.3530071\">10.1145/3528223.3530071</a>","apa":"Chen, R., Wang, Z., Song, P., &#38; Bickel, B. (2022). Computational design of high-level interlocking puzzles. <i>ACM Transactions on Graphics</i>. Association for Computing Machinery. <a href=\"https://doi.org/10.1145/3528223.3530071\">https://doi.org/10.1145/3528223.3530071</a>","ista":"Chen R, Wang Z, Song P, Bickel B. 2022. Computational design of high-level interlocking puzzles. ACM Transactions on Graphics. 41(4), 150.","mla":"Chen, Rulin, et al. “Computational Design of High-Level Interlocking Puzzles.” <i>ACM Transactions on Graphics</i>, vol. 41, no. 4, 150, Association for Computing Machinery, 2022, doi:<a href=\"https://doi.org/10.1145/3528223.3530071\">10.1145/3528223.3530071</a>.","chicago":"Chen, Rulin, Ziqi Wang, Peng Song, and Bernd Bickel. “Computational Design of High-Level Interlocking Puzzles.” <i>ACM Transactions on Graphics</i>. Association for Computing Machinery, 2022. <a href=\"https://doi.org/10.1145/3528223.3530071\">https://doi.org/10.1145/3528223.3530071</a>.","ieee":"R. Chen, Z. Wang, P. Song, and B. Bickel, “Computational design of high-level interlocking puzzles,” <i>ACM Transactions on Graphics</i>, vol. 41, no. 4. Association for Computing Machinery, 2022.","short":"R. Chen, Z. Wang, P. Song, B. Bickel, ACM Transactions on Graphics 41 (2022)."},"intvolume":"        41","related_material":{"link":[{"url":"https://ista.ac.at/en/news/unlocking-interlocking-riddles/","description":"News on ISTA website","relation":"press_release"}]}},{"publication":"Optics Express","article_type":"original","tmp":{"legal_code_url":"https://creativecommons.org/licenses/by/4.0/legalcode","image":"/images/cc_by.png","name":"Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)","short":"CC BY (4.0)"},"scopus_import":"1","article_processing_charge":"No","ec_funded":1,"user_id":"4359f0d1-fa6c-11eb-b949-802e58b17ae8","publisher":"The Optical Society","department":[{"_id":"BeBi"}],"title":"Robust and practical measurement of volume transport parameters in solid photo-polymer materials for 3D printing","author":[{"full_name":"Elek, Oskar","first_name":"Oskar","last_name":"Elek"},{"orcid":"0000-0002-3808-281X","id":"4DDBCEB0-F248-11E8-B48F-1D18A9856A87","full_name":"Zhang, Ran","last_name":"Zhang","first_name":"Ran"},{"last_name":"Sumin","first_name":"Denis","full_name":"Sumin, Denis"},{"first_name":"Karol","last_name":"Myszkowski","full_name":"Myszkowski, Karol"},{"last_name":"Bickel","first_name":"Bernd","id":"49876194-F248-11E8-B48F-1D18A9856A87","orcid":"0000-0001-6511-9385","full_name":"Bickel, Bernd"},{"first_name":"Alexander","last_name":"Wilkie","full_name":"Wilkie, Alexander"},{"first_name":"Jaroslav","last_name":"Křivánek","full_name":"Křivánek, Jaroslav"},{"last_name":"Weyrich","first_name":"Tim","full_name":"Weyrich, Tim"}],"file":[{"relation":"main_file","content_type":"application/pdf","file_size":10873700,"creator":"dernst","success":1,"file_name":"2021_OpticsExpress_Elek.pdf","date_created":"2021-03-22T08:15:28Z","access_level":"open_access","date_updated":"2021-03-22T08:15:28Z","file_id":"9269","checksum":"a9697ad83136c19ad87e46aa2db63cfd"}],"day":"01","isi":1,"issue":"5","language":[{"iso":"eng"}],"project":[{"call_identifier":"H2020","_id":"2508E324-B435-11E9-9278-68D0E5697425","name":"Distributed 3D Object Design","grant_number":"642841"},{"name":"MATERIALIZABLE: Intelligent fabrication-oriented Computational Design and Modeling","_id":"24F9549A-B435-11E9-9278-68D0E5697425","call_identifier":"H2020","grant_number":"715767"}],"doi":"10.1364/OE.406095","quality_controlled":"1","publication_identifier":{"eissn":["1094-4087"]},"_id":"9241","acknowledgement":"H2020 Marie Skłodowska-Curie Actions (642841); European Research Council (715767); Grantová Agentura České Republiky (16-08111S, 16-18964S); Univerzita Karlova v Praze (SVV-2017-260452); Engineering and Physical Sciences Research Council (EP/K023578/1).\r\nWe are grateful to Stratasys Ltd. for access to the voxel-level print interface of the J750\r\nmachine.","year":"2021","volume":29,"date_created":"2021-03-14T23:01:33Z","file_date_updated":"2021-03-22T08:15:28Z","page":"7568-7588","type":"journal_article","month":"03","oa_version":"Published Version","date_updated":"2023-08-07T14:11:57Z","abstract":[{"text":"Volumetric light transport is a pervasive physical phenomenon, and therefore its accurate simulation is important for a broad array of disciplines. While suitable mathematical models for computing the transport are now available, obtaining the necessary material parameters needed to drive such simulations is a challenging task: direct measurements of these parameters from material samples are seldom possible. Building on the inverse scattering paradigm, we present a novel measurement approach which indirectly infers the transport parameters from extrinsic observations of multiple-scattered radiance. The novelty of the proposed approach lies in replacing structured illumination with a structured reflector bonded to the sample, and a robust fitting procedure that largely compensates for potential systematic errors in the calibration of the setup. We show the feasibility of our approach by validating simulations of complex 3D compositions of the measured materials against physical prints, using photo-polymer resins. As presented in this paper, our technique yields colorspace data suitable for accurate appearance reproduction in the area of 3D printing. Beyond that, and without fundamental changes to the basic measurement methodology, it could equally well be used to obtain spectral measurements that are useful for other application areas.","lang":"eng"}],"intvolume":"        29","citation":{"chicago":"Elek, Oskar, Ran Zhang, Denis Sumin, Karol Myszkowski, Bernd Bickel, Alexander Wilkie, Jaroslav Křivánek, and Tim Weyrich. “Robust and Practical Measurement of Volume Transport Parameters in Solid Photo-Polymer Materials for 3D Printing.” <i>Optics Express</i>. The Optical Society, 2021. <a href=\"https://doi.org/10.1364/OE.406095\">https://doi.org/10.1364/OE.406095</a>.","ieee":"O. Elek <i>et al.</i>, “Robust and practical measurement of volume transport parameters in solid photo-polymer materials for 3D printing,” <i>Optics Express</i>, vol. 29, no. 5. The Optical Society, pp. 7568–7588, 2021.","short":"O. Elek, R. Zhang, D. Sumin, K. Myszkowski, B. Bickel, A. Wilkie, J. Křivánek, T. Weyrich, Optics Express 29 (2021) 7568–7588.","ama":"Elek O, Zhang R, Sumin D, et al. Robust and practical measurement of volume transport parameters in solid photo-polymer materials for 3D printing. <i>Optics Express</i>. 2021;29(5):7568-7588. doi:<a href=\"https://doi.org/10.1364/OE.406095\">10.1364/OE.406095</a>","apa":"Elek, O., Zhang, R., Sumin, D., Myszkowski, K., Bickel, B., Wilkie, A., … Weyrich, T. (2021). Robust and practical measurement of volume transport parameters in solid photo-polymer materials for 3D printing. <i>Optics Express</i>. The Optical Society. <a href=\"https://doi.org/10.1364/OE.406095\">https://doi.org/10.1364/OE.406095</a>","ista":"Elek O, Zhang R, Sumin D, Myszkowski K, Bickel B, Wilkie A, Křivánek J, Weyrich T. 2021. Robust and practical measurement of volume transport parameters in solid photo-polymer materials for 3D printing. Optics Express. 29(5), 7568–7588.","mla":"Elek, Oskar, et al. “Robust and Practical Measurement of Volume Transport Parameters in Solid Photo-Polymer Materials for 3D Printing.” <i>Optics Express</i>, vol. 29, no. 5, The Optical Society, 2021, pp. 7568–88, doi:<a href=\"https://doi.org/10.1364/OE.406095\">10.1364/OE.406095</a>."},"status":"public","external_id":{"isi":["000624968100103"]},"ddc":["000"],"date_published":"2021-03-01T00:00:00Z","oa":1,"publication_status":"published","has_accepted_license":"1"},{"article_number":"186","title":"Computational design of planar multistable compliant structures","author":[{"first_name":"Ran","last_name":"Zhang","orcid":"0000-0002-3808-281X","id":"4DDBCEB0-F248-11E8-B48F-1D18A9856A87","full_name":"Zhang, Ran"},{"last_name":"Auzinger","first_name":"Thomas","full_name":"Auzinger, Thomas","id":"4718F954-F248-11E8-B48F-1D18A9856A87","orcid":"0000-0002-1546-3265"},{"orcid":"0000-0001-6511-9385","id":"49876194-F248-11E8-B48F-1D18A9856A87","full_name":"Bickel, Bernd","first_name":"Bernd","last_name":"Bickel"}],"file":[{"date_created":"2021-05-08T17:36:59Z","access_level":"open_access","date_updated":"2021-05-08T17:36:59Z","file_id":"9377","checksum":"8564b3118457d4c8939a8ef2b1a2f16c","content_type":"application/pdf","relation":"main_file","file_size":18926557,"creator":"bbickel","file_name":"Multistable-authorversion.pdf"},{"checksum":"3b6e874e30bfa1bfc3ad3498710145a1","file_id":"9378","date_updated":"2021-05-08T17:38:22Z","access_level":"open_access","date_created":"2021-05-08T17:38:22Z","file_name":"multistable-video.mp4","success":1,"creator":"bbickel","file_size":76542901,"relation":"main_file","content_type":"video/mp4"},{"content_type":"application/pdf","relation":"supplementary_material","file_size":3367072,"creator":"bbickel","file_name":"multistable-supplementary material.pdf","date_created":"2021-12-17T08:13:51Z","access_level":"open_access","title":"Supplementary Material for “Computational Design of Planar Multistable Compliant Structures”","date_updated":"2021-12-17T08:13:51Z","file_id":"10562","checksum":"20dc3bc42e1a912a5b0247c116772098","description":"This document provides additional results and analyzes the robustness and limitations of our approach."}],"day":"08","publication":"ACM Transactions on Graphics","tmp":{"legal_code_url":"https://creativecommons.org/licenses/by/4.0/legalcode","image":"/images/cc_by.png","name":"Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)","short":"CC BY (4.0)"},"article_type":"original","article_processing_charge":"No","ec_funded":1,"publisher":"Association for Computing Machinery","user_id":"4359f0d1-fa6c-11eb-b949-802e58b17ae8","department":[{"_id":"BeBi"}],"doi":"10.1145/3453477","quality_controlled":"1","publication_identifier":{"eissn":["1557-7368"],"issn":["0730-0301"]},"keyword":["multistability","mechanism","computational design","rigidity"],"isi":1,"issue":"5","language":[{"iso":"eng"}],"project":[{"name":"Distributed 3D Object Design","_id":"2508E324-B435-11E9-9278-68D0E5697425","call_identifier":"H2020","grant_number":"642841"},{"name":"MATERIALIZABLE: Intelligent fabrication-oriented Computational Design and Modeling","_id":"24F9549A-B435-11E9-9278-68D0E5697425","call_identifier":"H2020","grant_number":"715767"}],"volume":40,"date_created":"2021-05-08T17:37:08Z","file_date_updated":"2021-12-17T08:13:51Z","month":"10","oa_version":"Published Version","type":"journal_article","date_updated":"2023-08-08T13:31:38Z","abstract":[{"lang":"eng","text":"This paper presents a method for designing planar multistable compliant structures. Given a sequence of desired stable states and the corresponding poses of the structure, we identify the topology and geometric realization of a mechanism—consisting of bars and joints—that is able to physically reproduce the desired multistable behavior. In order to solve this problem efficiently, we build on insights from minimally rigid graph theory to identify simple but effective topologies for the mechanism. We then optimize its geometric parameters, such as joint positions and bar lengths, to obtain correct transitions between the given poses. Simultaneously, we ensure adequate stability of each pose based on an effective approximate error metric related to the elastic energy Hessian of the bars in the mechanism. As demonstrated by our results, we obtain functional multistable mechanisms of manageable complexity that can be fabricated using 3D printing. Further, we evaluated the effectiveness of our method on a large number of examples in the simulation and fabricated several physical prototypes."}],"_id":"9376","acknowledgement":"We would like to thank everyone who contributed to this paper, the authors of artworks for all the examples, including @macrovec-tor_official and Wikimedia for the FLAG semaphore, and @pikisuper-star for the FIGURINE. The photos of iconic poses in the teaser were supplied by (from left to right): Mike Hewitt/Olympics Day 8 - Athletics/Gettty Images, Oneinchpunch/Basketball player training on acourt in New york city/Shutterstock, and Andrew Redington/TigerWoods/Getty Images. We also want to express our gratitude to Christian Hafner for insightful discussions, the IST Austria machine shop SSU, all proof-readers, and anonymous reviewers. This project has received funding from the European Union’s Horizon 2020 research and innovation programme, under the Marie Skłodowska-Curie grant agreement No 642841 (DISTRO), and under the European Research Council grant agreement No 715767 (MATERIALIZABLE).","year":"2021","date_published":"2021-10-08T00:00:00Z","ddc":["000"],"acknowledged_ssus":[{"_id":"M-Shop"}],"publication_status":"published","oa":1,"has_accepted_license":"1","intvolume":"        40","citation":{"short":"R. Zhang, T. Auzinger, B. Bickel, ACM Transactions on Graphics 40 (2021).","ieee":"R. Zhang, T. Auzinger, and B. Bickel, “Computational design of planar multistable compliant structures,” <i>ACM Transactions on Graphics</i>, vol. 40, no. 5. Association for Computing Machinery, 2021.","chicago":"Zhang, Ran, Thomas Auzinger, and Bernd Bickel. “Computational Design of Planar Multistable Compliant Structures.” <i>ACM Transactions on Graphics</i>. Association for Computing Machinery, 2021. <a href=\"https://doi.org/10.1145/3453477\">https://doi.org/10.1145/3453477</a>.","ista":"Zhang R, Auzinger T, Bickel B. 2021. Computational design of planar multistable compliant structures. ACM Transactions on Graphics. 40(5), 186.","mla":"Zhang, Ran, et al. “Computational Design of Planar Multistable Compliant Structures.” <i>ACM Transactions on Graphics</i>, vol. 40, no. 5, 186, Association for Computing Machinery, 2021, doi:<a href=\"https://doi.org/10.1145/3453477\">10.1145/3453477</a>.","apa":"Zhang, R., Auzinger, T., &#38; Bickel, B. (2021). Computational design of planar multistable compliant structures. <i>ACM Transactions on Graphics</i>. Association for Computing Machinery. <a href=\"https://doi.org/10.1145/3453477\">https://doi.org/10.1145/3453477</a>","ama":"Zhang R, Auzinger T, Bickel B. Computational design of planar multistable compliant structures. <i>ACM Transactions on Graphics</i>. 2021;40(5). doi:<a href=\"https://doi.org/10.1145/3453477\">10.1145/3453477</a>"},"external_id":{"isi":["000752079300003"]},"status":"public"},{"user_id":"4359f0d1-fa6c-11eb-b949-802e58b17ae8","publisher":"IEEE","department":[{"_id":"BeBi"}],"pmid":1,"publication":"IEEE Transactions on Visualization and Computer Graphics","tmp":{"legal_code_url":"https://creativecommons.org/licenses/by/4.0/legalcode","image":"/images/cc_by.png","name":"Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)","short":"CC BY (4.0)"},"ec_funded":1,"article_processing_charge":"No","scopus_import":"1","author":[{"last_name":"Feng","first_name":"Xudong","full_name":"Feng, Xudong"},{"full_name":"Liu, Jiafeng","first_name":"Jiafeng","last_name":"Liu"},{"last_name":"Wang","first_name":"Huamin","full_name":"Wang, Huamin"},{"full_name":"Yang, Yin","last_name":"Yang","first_name":"Yin"},{"first_name":"Hujun","last_name":"Bao","full_name":"Bao, Hujun"},{"last_name":"Bickel","first_name":"Bernd","full_name":"Bickel, Bernd","id":"49876194-F248-11E8-B48F-1D18A9856A87","orcid":"0000-0001-6511-9385"},{"full_name":"Xu, Weiwei","last_name":"Xu","first_name":"Weiwei"}],"day":"01","file":[{"access_level":"open_access","date_created":"2021-05-25T15:08:49Z","checksum":"a78e6ac94e33ade4ffaea66943d5f7dc","date_updated":"2021-05-25T15:08:49Z","file_id":"9427","creator":"kschuh","relation":"main_file","content_type":"application/pdf","file_size":6183002,"success":1,"file_name":"2021_TVCG_Feng.pdf"}],"article_number":"2881-2895","title":"Computational design of skinned Quad-Robots","project":[{"name":"MATERIALIZABLE: Intelligent fabrication-oriented Computational Design and Modeling","call_identifier":"H2020","_id":"24F9549A-B435-11E9-9278-68D0E5697425","grant_number":"715767"}],"isi":1,"issue":"6","language":[{"iso":"eng"}],"publication_identifier":{"eissn":["10772626"],"issn":["19410506"]},"doi":"10.1109/TVCG.2019.2957218","quality_controlled":"1","acknowledgement":"The authors would like to thank anonymous reviewers for their constructive comments. Weiwei Xu is partially supported by Zhejiang Lab. Yin Yang is partially spported by NSF under Grant Nos. CHS 1845024 and 1717972. Weiwei Xu and Hujun Bao are supported by Fundamental Research Funds for the Central Universities. This project has received funding from the European Research Council (ERC) under the European Unions Horizon 2020 research and innovation programme (Grant agreement No 715767).","year":"2021","_id":"9408","type":"journal_article","month":"06","oa_version":"Published Version","abstract":[{"text":"We present a computational design system that assists users to model, optimize, and fabricate quad-robots with soft skins. Our system addresses the challenging task of predicting their physical behavior by fully integrating the multibody dynamics of the mechanical skeleton and the elastic behavior of the soft skin. The developed motion control strategy uses an alternating optimization scheme to avoid expensive full space time-optimization, interleaving space-time optimization for the skeleton, and frame-by-frame optimization for the full dynamics. The output are motor torques to drive the robot to achieve a user prescribed motion trajectory. We also provide a collection of convenient engineering tools and empirical manufacturing guidance to support the fabrication of the designed quad-robot. We validate the feasibility of designs generated with our system through physics simulations and with a physically-fabricated prototype.","lang":"eng"}],"date_updated":"2023-08-08T13:45:46Z","volume":27,"file_date_updated":"2021-05-25T15:08:49Z","date_created":"2021-05-23T22:01:42Z","status":"public","external_id":{"pmid":["31804937"],"isi":["000649620700009"]},"intvolume":"        27","citation":{"short":"X. Feng, J. Liu, H. Wang, Y. Yang, H. Bao, B. Bickel, W. Xu, IEEE Transactions on Visualization and Computer Graphics 27 (2021).","ieee":"X. Feng <i>et al.</i>, “Computational design of skinned Quad-Robots,” <i>IEEE Transactions on Visualization and Computer Graphics</i>, vol. 27, no. 6. IEEE, 2021.","chicago":"Feng, Xudong, Jiafeng Liu, Huamin Wang, Yin Yang, Hujun Bao, Bernd Bickel, and Weiwei Xu. “Computational Design of Skinned Quad-Robots.” <i>IEEE Transactions on Visualization and Computer Graphics</i>. IEEE, 2021. <a href=\"https://doi.org/10.1109/TVCG.2019.2957218\">https://doi.org/10.1109/TVCG.2019.2957218</a>.","ista":"Feng X, Liu J, Wang H, Yang Y, Bao H, Bickel B, Xu W. 2021. Computational design of skinned Quad-Robots. IEEE Transactions on Visualization and Computer Graphics. 27(6), 2881–2895.","mla":"Feng, Xudong, et al. “Computational Design of Skinned Quad-Robots.” <i>IEEE Transactions on Visualization and Computer Graphics</i>, vol. 27, no. 6, 2881–2895, IEEE, 2021, doi:<a href=\"https://doi.org/10.1109/TVCG.2019.2957218\">10.1109/TVCG.2019.2957218</a>.","apa":"Feng, X., Liu, J., Wang, H., Yang, Y., Bao, H., Bickel, B., &#38; Xu, W. (2021). Computational design of skinned Quad-Robots. <i>IEEE Transactions on Visualization and Computer Graphics</i>. IEEE. <a href=\"https://doi.org/10.1109/TVCG.2019.2957218\">https://doi.org/10.1109/TVCG.2019.2957218</a>","ama":"Feng X, Liu J, Wang H, et al. Computational design of skinned Quad-Robots. <i>IEEE Transactions on Visualization and Computer Graphics</i>. 2021;27(6). doi:<a href=\"https://doi.org/10.1109/TVCG.2019.2957218\">10.1109/TVCG.2019.2957218</a>"},"oa":1,"publication_status":"published","has_accepted_license":"1","date_published":"2021-06-01T00:00:00Z","ddc":["000"]},{"acknowledgement":"We thank Sebastian Cucerca for processing and capturing the phys-cal printouts. This work was supported by the Charles University grant SVV-260588 and Czech Science Foundation grant 19-07626S. This project has received funding from the European Union’s Horizon 2020 research and innovation programme, under the Marie Skłodowska Curie grant agreements No 642841 (DISTRO) and No765911 (RealVision), and under the European Research Council grant agreement No 715767 (MATERIALIZABLE).","year":"2021","_id":"9547","page":"205-219","oa_version":"Submitted Version","type":"journal_article","month":"05","date_updated":"2023-08-14T08:01:50Z","abstract":[{"lang":"eng","text":"With the wider availability of full-color 3D printers, color-accurate 3D-print preparation has received increased attention. A key challenge lies in the inherent translucency of commonly used print materials that blurs out details of the color texture. Previous work tries to compensate for these scattering effects through strategic assignment of colored primary materials to printer voxels. To date, the highest-quality approach uses iterative optimization that relies on computationally expensive Monte Carlo light transport simulation to predict the surface appearance from subsurface scattering within a given print material distribution; that optimization, however, takes in the order of days on a single machine. In our work, we dramatically speed up the process by replacing the light transport simulation with a data-driven approach. Leveraging a deep neural network to predict the scattering within a highly heterogeneous medium, our method performs around two orders of magnitude faster than Monte Carlo rendering while yielding optimization results of similar quality level. The network is based on an established method from atmospheric cloud rendering, adapted to our domain and extended by a physically motivated weight sharing scheme that substantially reduces the network size. We analyze its performance in an end-to-end print preparation pipeline and compare quality and runtime to alternative approaches, and demonstrate its generalization to unseen geometry and material values. This for the first time enables full heterogenous material optimization for 3D-print preparation within time frames in the order of the actual printing time."}],"volume":40,"file_date_updated":"2021-10-11T12:06:50Z","date_created":"2021-06-13T22:01:32Z","status":"public","external_id":{"isi":["000657959600017"]},"intvolume":"        40","citation":{"mla":"Rittig, Tobias, et al. “Neural Acceleration of Scattering-Aware Color 3D Printing.” <i>Computer Graphics Forum</i>, vol. 40, no. 2, Wiley, 2021, pp. 205–19, doi:<a href=\"https://doi.org/10.1111/cgf.142626\">10.1111/cgf.142626</a>.","ista":"Rittig T, Sumin D, Babaei V, Didyk P, Voloboy A, Wilkie A, Bickel B, Myszkowski K, Weyrich T, Křivánek J. 2021. Neural acceleration of scattering-aware color 3D printing. Computer Graphics Forum. 40(2), 205–219.","apa":"Rittig, T., Sumin, D., Babaei, V., Didyk, P., Voloboy, A., Wilkie, A., … Křivánek, J. (2021). Neural acceleration of scattering-aware color 3D printing. <i>Computer Graphics Forum</i>. Wiley. <a href=\"https://doi.org/10.1111/cgf.142626\">https://doi.org/10.1111/cgf.142626</a>","ama":"Rittig T, Sumin D, Babaei V, et al. Neural acceleration of scattering-aware color 3D printing. <i>Computer Graphics Forum</i>. 2021;40(2):205-219. doi:<a href=\"https://doi.org/10.1111/cgf.142626\">10.1111/cgf.142626</a>","short":"T. Rittig, D. Sumin, V. Babaei, P. Didyk, A. Voloboy, A. Wilkie, B. Bickel, K. Myszkowski, T. Weyrich, J. Křivánek, Computer Graphics Forum 40 (2021) 205–219.","ieee":"T. Rittig <i>et al.</i>, “Neural acceleration of scattering-aware color 3D printing,” <i>Computer Graphics Forum</i>, vol. 40, no. 2. Wiley, pp. 205–219, 2021.","chicago":"Rittig, Tobias, Denis Sumin, Vahid Babaei, Piotr Didyk, Alexey Voloboy, Alexander Wilkie, Bernd Bickel, Karol Myszkowski, Tim Weyrich, and Jaroslav Křivánek. “Neural Acceleration of Scattering-Aware Color 3D Printing.” <i>Computer Graphics Forum</i>. Wiley, 2021. <a href=\"https://doi.org/10.1111/cgf.142626\">https://doi.org/10.1111/cgf.142626</a>."},"oa":1,"publication_status":"published","has_accepted_license":"1","ddc":["004"],"date_published":"2021-05-01T00:00:00Z","publisher":"Wiley","user_id":"4359f0d1-fa6c-11eb-b949-802e58b17ae8","department":[{"_id":"BeBi"}],"publication":"Computer Graphics Forum","article_type":"original","article_processing_charge":"No","scopus_import":"1","ec_funded":1,"author":[{"full_name":"Rittig, Tobias","first_name":"Tobias","last_name":"Rittig"},{"full_name":"Sumin, Denis","last_name":"Sumin","first_name":"Denis"},{"first_name":"Vahid","last_name":"Babaei","full_name":"Babaei, Vahid"},{"full_name":"Didyk, Piotr","last_name":"Didyk","first_name":"Piotr"},{"full_name":"Voloboy, Alexey","first_name":"Alexey","last_name":"Voloboy"},{"full_name":"Wilkie, Alexander","last_name":"Wilkie","first_name":"Alexander"},{"id":"49876194-F248-11E8-B48F-1D18A9856A87","orcid":"0000-0001-6511-9385","full_name":"Bickel, Bernd","last_name":"Bickel","first_name":"Bernd"},{"last_name":"Myszkowski","first_name":"Karol","full_name":"Myszkowski, Karol"},{"first_name":"Tim","last_name":"Weyrich","full_name":"Weyrich, Tim"},{"full_name":"Křivánek, Jaroslav","last_name":"Křivánek","first_name":"Jaroslav"}],"file":[{"checksum":"33271724215f54a75c39d2ed40f2c502","file_id":"10120","date_updated":"2021-10-11T12:06:50Z","access_level":"open_access","date_created":"2021-10-11T12:06:50Z","file_name":"ScatteringAwareColor3DPrinting_authorVersion.pdf","success":1,"creator":"bbickel","file_size":26026501,"content_type":"application/pdf","relation":"main_file"}],"day":"01","title":"Neural acceleration of scattering-aware color 3D printing","project":[{"grant_number":"642841","name":"Distributed 3D Object Design","_id":"2508E324-B435-11E9-9278-68D0E5697425","call_identifier":"H2020"},{"grant_number":"715767","_id":"24F9549A-B435-11E9-9278-68D0E5697425","call_identifier":"H2020","name":"MATERIALIZABLE: Intelligent fabrication-oriented Computational Design and Modeling"}],"isi":1,"issue":"2","language":[{"iso":"eng"}],"publication_identifier":{"issn":["0167-7055"],"eissn":["1467-8659"]},"doi":"10.1111/cgf.142626","quality_controlled":"1"},{"publication_identifier":{"issn":["0730-0301"],"eissn":["1557-7368 "]},"quality_controlled":"1","doi":"10.1145/3478513.3480555","project":[{"grant_number":"715767","name":"MATERIALIZABLE: Intelligent fabrication-oriented Computational Design and Modeling","call_identifier":"H2020","_id":"24F9549A-B435-11E9-9278-68D0E5697425"}],"issue":"6","language":[{"iso":"eng"}],"isi":1,"day":"01","file":[{"file_name":"rigidmolds-authorversion.pdf","creator":"bbickel","file_size":107708317,"relation":"main_file","content_type":"application/pdf","checksum":"384ece7a9ad1026787ba9560b04336d5","file_id":"10185","date_updated":"2021-10-27T07:08:07Z","access_level":"open_access","date_created":"2021-10-27T07:08:07Z"}],"author":[{"last_name":"Alderighi","first_name":"Thomas","full_name":"Alderighi, Thomas"},{"last_name":"Malomo","first_name":"Luigi","full_name":"Malomo, Luigi"},{"orcid":"0000-0001-6511-9385","id":"49876194-F248-11E8-B48F-1D18A9856A87","full_name":"Bickel, Bernd","first_name":"Bernd","last_name":"Bickel"},{"last_name":"Cignoni","first_name":"Paolo","full_name":"Cignoni, Paolo"},{"full_name":"Pietroni, Nico","first_name":"Nico","last_name":"Pietroni"}],"article_number":"272","title":"Volume decomposition for two-piece rigid casting","department":[{"_id":"BeBi"}],"user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","publisher":"Association for Computing Machinery","article_type":"original","article_processing_charge":"No","ec_funded":1,"publication":"ACM Transactions on Graphics","has_accepted_license":"1","oa":1,"publication_status":"published","main_file_link":[{"open_access":"1","url":"http://vcg.isti.cnr.it/Publications/2021/AMBCP21"}],"ddc":["000"],"date_published":"2021-12-01T00:00:00Z","status":"public","external_id":{"isi":["000729846700077"]},"citation":{"ista":"Alderighi T, Malomo L, Bickel B, Cignoni P, Pietroni N. 2021. Volume decomposition for two-piece rigid casting. ACM Transactions on Graphics. 40(6), 272.","mla":"Alderighi, Thomas, et al. “Volume Decomposition for Two-Piece Rigid Casting.” <i>ACM Transactions on Graphics</i>, vol. 40, no. 6, 272, Association for Computing Machinery, 2021, doi:<a href=\"https://doi.org/10.1145/3478513.3480555\">10.1145/3478513.3480555</a>.","apa":"Alderighi, T., Malomo, L., Bickel, B., Cignoni, P., &#38; Pietroni, N. (2021). Volume decomposition for two-piece rigid casting. <i>ACM Transactions on Graphics</i>. Association for Computing Machinery. <a href=\"https://doi.org/10.1145/3478513.3480555\">https://doi.org/10.1145/3478513.3480555</a>","ama":"Alderighi T, Malomo L, Bickel B, Cignoni P, Pietroni N. Volume decomposition for two-piece rigid casting. <i>ACM Transactions on Graphics</i>. 2021;40(6). doi:<a href=\"https://doi.org/10.1145/3478513.3480555\">10.1145/3478513.3480555</a>","short":"T. Alderighi, L. Malomo, B. Bickel, P. Cignoni, N. Pietroni, ACM Transactions on Graphics 40 (2021).","ieee":"T. Alderighi, L. Malomo, B. Bickel, P. Cignoni, and N. Pietroni, “Volume decomposition for two-piece rigid casting,” <i>ACM Transactions on Graphics</i>, vol. 40, no. 6. Association for Computing Machinery, 2021.","chicago":"Alderighi, Thomas, Luigi Malomo, Bernd Bickel, Paolo Cignoni, and Nico Pietroni. “Volume Decomposition for Two-Piece Rigid Casting.” <i>ACM Transactions on Graphics</i>. Association for Computing Machinery, 2021. <a href=\"https://doi.org/10.1145/3478513.3480555\">https://doi.org/10.1145/3478513.3480555</a>."},"intvolume":"        40","type":"journal_article","oa_version":"Submitted Version","month":"12","date_updated":"2024-02-28T12:52:48Z","abstract":[{"text":"We introduce a novel technique to automatically decompose an input object’s volume into a set of parts that can be represented by two opposite height fields. Such decomposition enables the manufacturing of individual parts using two-piece reusable rigid molds. Our decomposition strategy relies on a new energy formulation that utilizes a pre-computed signal on the mesh volume representing the accessibility for a predefined set of extraction directions. Thanks to this novel formulation, our method allows for efficient optimization of a fabrication-aware partitioning of volumes in a completely\r\nautomatic way. We demonstrate the efficacy of our approach by generating valid volume partitionings for a wide range of complex objects and physically reproducing several of them.","lang":"eng"}],"date_created":"2021-10-27T07:08:19Z","file_date_updated":"2021-10-27T07:08:07Z","volume":40,"year":"2021","acknowledgement":"The authors thank Marco Callieri for all his precious help with the resin casts. The models used in the paper are courtesy of the Stanford 3D Scanning Repository, the AIM@SHAPE Shape Repository, and Thingi10K Repository. The research was partially funded by the European Research Council (ERC) MATERIALIZABLE: Intelligent fabrication-oriented computational design and modeling (grant no. 715767).","_id":"10184"},{"publication_identifier":{"issn":["0730-0301"],"eissn":["1557-7368"]},"quality_controlled":"1","doi":"10.1145/3450626.3459800","project":[{"grant_number":"715767","name":"MATERIALIZABLE: Intelligent fabrication-oriented Computational Design and Modeling","_id":"24F9549A-B435-11E9-9278-68D0E5697425","call_identifier":"H2020"}],"issue":"4","language":[{"iso":"eng"}],"keyword":["Computing methodologies","shape modeling","modeling and simulation","theory of computation","computational geometry","mathematics of computing","mathematical optimization"],"conference":{"end_date":"2021-08-13","name":"SIGGRAF: Special Interest Group on Computer Graphics and Interactive Techniques","location":"Virtual","start_date":"2021-08-09"},"isi":1,"file":[{"date_updated":"2021-10-18T10:42:15Z","file_id":"10150","checksum":"7e5d08ce46b0451b3102eacd3d00f85f","date_created":"2021-10-18T10:42:15Z","access_level":"open_access","success":1,"file_name":"elastic-curves-paper.pdf","content_type":"application/pdf","relation":"main_file","file_size":17064290,"creator":"chafner"},{"file_name":"elastic-curves-supp.pdf","file_size":547156,"content_type":"application/pdf","relation":"supplementary_material","creator":"chafner","file_id":"10151","date_updated":"2021-10-18T10:42:22Z","checksum":"0088643478be7c01a703b5b10767348f","date_created":"2021-10-18T10:42:22Z","access_level":"open_access"}],"day":"19","author":[{"id":"400429CC-F248-11E8-B48F-1D18A9856A87","full_name":"Hafner, Christian","last_name":"Hafner","first_name":"Christian"},{"last_name":"Bickel","first_name":"Bernd","id":"49876194-F248-11E8-B48F-1D18A9856A87","orcid":"0000-0001-6511-9385","full_name":"Bickel, Bernd"}],"article_number":"126","title":"The design space of plane elastic curves","department":[{"_id":"BeBi"}],"user_id":"4359f0d1-fa6c-11eb-b949-802e58b17ae8","publisher":"Association for Computing Machinery","tmp":{"legal_code_url":"https://creativecommons.org/licenses/by/4.0/legalcode","image":"/images/cc_by.png","name":"Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)","short":"CC BY (4.0)"},"article_type":"original","article_processing_charge":"No","scopus_import":"1","ec_funded":1,"publication":"ACM Transactions on Graphics","has_accepted_license":"1","publication_status":"published","oa":1,"ddc":["516"],"date_published":"2021-07-19T00:00:00Z","status":"public","external_id":{"isi":["000674930900091"]},"citation":{"ieee":"C. Hafner and B. Bickel, “The design space of plane elastic curves,” <i>ACM Transactions on Graphics</i>, vol. 40, no. 4. Association for Computing Machinery, 2021.","chicago":"Hafner, Christian, and Bernd Bickel. “The Design Space of Plane Elastic Curves.” <i>ACM Transactions on Graphics</i>. Association for Computing Machinery, 2021. <a href=\"https://doi.org/10.1145/3450626.3459800\">https://doi.org/10.1145/3450626.3459800</a>.","short":"C. Hafner, B. Bickel, ACM Transactions on Graphics 40 (2021).","ama":"Hafner C, Bickel B. The design space of plane elastic curves. <i>ACM Transactions on Graphics</i>. 2021;40(4). doi:<a href=\"https://doi.org/10.1145/3450626.3459800\">10.1145/3450626.3459800</a>","mla":"Hafner, Christian, and Bernd Bickel. “The Design Space of Plane Elastic Curves.” <i>ACM Transactions on Graphics</i>, vol. 40, no. 4, 126, Association for Computing Machinery, 2021, doi:<a href=\"https://doi.org/10.1145/3450626.3459800\">10.1145/3450626.3459800</a>.","ista":"Hafner C, Bickel B. 2021. The design space of plane elastic curves. ACM Transactions on Graphics. 40(4), 126.","apa":"Hafner, C., &#38; Bickel, B. (2021). The design space of plane elastic curves. <i>ACM Transactions on Graphics</i>. Virtual: Association for Computing Machinery. <a href=\"https://doi.org/10.1145/3450626.3459800\">https://doi.org/10.1145/3450626.3459800</a>"},"related_material":{"link":[{"relation":"press_release","description":"News on IST Website","url":"https://ist.ac.at/en/news/designing-with-elastic-structures/"}],"record":[{"relation":"dissertation_contains","id":"12897","status":"public"}]},"intvolume":"        40","type":"journal_article","oa_version":"Published Version","month":"07","abstract":[{"lang":"eng","text":"Elastic bending of initially flat slender elements allows the realization and economic fabrication of intriguing curved shapes. In this work, we derive an intuitive but rigorous geometric characterization of the design space of plane elastic rods with variable stiffness. It enables designers to determine which shapes are physically viable with active bending by visual inspection alone. Building on these insights, we propose a method for efficiently designing the geometry of a flat elastic rod that realizes a target equilibrium curve, which only requires solving a linear program. We implement this method in an interactive computational design tool that gives feedback about the feasibility of a design, and computes the geometry of the structural elements necessary to realize it within an instant. The tool also offers an iterative optimization routine that improves the fabricability of a model while modifying it as little as possible. In addition, we use our geometric characterization to derive an algorithm for analyzing and recovering the stability of elastic curves that would otherwise snap out of their unstable equilibrium shapes by buckling. We show the efficacy of our approach by designing and manufacturing several physical models that are assembled from flat elements."}],"date_updated":"2024-03-25T23:30:26Z","file_date_updated":"2021-10-18T10:42:22Z","date_created":"2021-08-08T22:01:26Z","volume":40,"year":"2021","acknowledgement":"We thank the anonymous reviewers for their generous feedback, and Michal Piovarči for his help in producing the supplemental video. This project has received funding from the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme (grant agreement No 715767).\r\n","_id":"9817"},{"degree_awarded":"PhD","title":"Computational design of curved thin shells: From glass façades to programmable matter","day":"21","file":[{"access_level":"open_access","date_created":"2020-09-10T16:11:49Z","checksum":"f8da89553da36037296b0a80f14ebf50","date_updated":"2020-09-10T16:11:49Z","file_id":"8367","creator":"rguseino","content_type":"application/pdf","relation":"main_file","file_size":70950442,"success":1,"file_name":"thesis_rguseinov.pdf"},{"content_type":"application/x-zip-compressed","relation":"source_file","file_size":76207597,"creator":"rguseino","file_name":"thesis_source.zip","date_created":"2020-09-11T09:39:48Z","access_level":"closed","date_updated":"2020-09-16T15:11:01Z","file_id":"8374","checksum":"e8fd944c960c20e0e27e6548af69121d"}],"author":[{"first_name":"Ruslan","last_name":"Guseinov","id":"3AB45EE2-F248-11E8-B48F-1D18A9856A87","orcid":"0000-0001-9819-5077","full_name":"Guseinov, Ruslan"}],"article_processing_charge":"No","ec_funded":1,"department":[{"_id":"BeBi"}],"publisher":"Institute of Science and Technology Austria","user_id":"c635000d-4b10-11ee-a964-aac5a93f6ac1","doi":"10.15479/AT:ISTA:8366","publication_identifier":{"isbn":["978-3-99078-010-7"],"issn":["2663-337X"]},"language":[{"iso":"eng"}],"keyword":["computer-aided design","shape modeling","self-morphing","mechanical engineering"],"project":[{"call_identifier":"H2020","_id":"24F9549A-B435-11E9-9278-68D0E5697425","name":"MATERIALIZABLE: Intelligent fabrication-oriented Computational Design and Modeling","grant_number":"715767"}],"date_created":"2020-09-10T16:19:55Z","file_date_updated":"2020-09-16T15:11:01Z","abstract":[{"lang":"eng","text":"Fabrication of curved shells plays an important role in modern design, industry, and science. Among their remarkable properties are, for example, aesthetics of organic shapes, ability to evenly distribute loads, or efficient flow separation. They find applications across vast length scales ranging from sky-scraper architecture to microscopic devices. But, at\r\nthe same time, the design of curved shells and their manufacturing process pose a variety of challenges. In this thesis, they are addressed from several perspectives. In particular, this thesis presents approaches based on the transformation of initially flat sheets into the target curved surfaces. This involves problems of interactive design of shells with nontrivial mechanical constraints, inverse design of complex structural materials, and data-driven modeling of delicate and time-dependent physical properties. At the same time, two newly-developed self-morphing mechanisms targeting flat-to-curved transformation are presented.\r\nIn architecture, doubly curved surfaces can be realized as cold bent glass panelizations. Originally flat glass panels are bent into frames and remain stressed. This is a cost-efficient fabrication approach compared to hot bending, when glass panels are shaped plastically. However such constructions are prone to breaking during bending, and it is highly\r\nnontrivial to navigate the design space, keeping the panels fabricable and aesthetically pleasing at the same time. We introduce an interactive design system for cold bent glass façades, while previously even offline optimization for such scenarios has not been sufficiently developed. Our method is based on a deep learning approach providing quick\r\nand high precision estimation of glass panel shape and stress while handling the shape\r\nmultimodality.\r\nFabrication of smaller objects of scales below 1 m, can also greatly benefit from shaping originally flat sheets. In this respect, we designed new self-morphing shell mechanisms transforming from an initial flat state to a doubly curved state with high precision and detail. Our so-called CurveUps demonstrate the encodement of the geometric information\r\ninto the shell. Furthermore, we explored the frontiers of programmable materials and showed how temporal information can additionally be encoded into a flat shell. This allows prescribing deformation sequences for doubly curved surfaces and, thus, facilitates self-collision avoidance enabling complex shapes and functionalities otherwise impossible.\r\nBoth of these methods include inverse design tools keeping the user in the design loop."}],"date_updated":"2024-02-21T12:44:29Z","type":"dissertation","month":"09","oa_version":"Published Version","page":"118","_id":"8366","year":"2020","acknowledgement":"During the work on this thesis, I received substantial support from IST Austria’s scientific service units. A big thank you to Todor Asenov and other Miba Machine Shop team members for their help with fabrication of experimental prototypes. In addition, I would like to thank Scientific Computing team for the support with high performance computing.\r\nFinancial support was provided by the European Research Council (ERC) under grant agreement No 715767 - MATERIALIZABLE: Intelligent fabrication-oriented Computational Design and Modeling, which I gratefully acknowledge.","acknowledged_ssus":[{"_id":"M-Shop"},{"_id":"ScienComp"}],"supervisor":[{"first_name":"Bernd","last_name":"Bickel","orcid":"0000-0001-6511-9385","id":"49876194-F248-11E8-B48F-1D18A9856A87","full_name":"Bickel, Bernd"}],"ddc":["000"],"date_published":"2020-09-21T00:00:00Z","has_accepted_license":"1","oa":1,"publication_status":"published","citation":{"ama":"Guseinov R. Computational design of curved thin shells: From glass façades to programmable matter. 2020. doi:<a href=\"https://doi.org/10.15479/AT:ISTA:8366\">10.15479/AT:ISTA:8366</a>","apa":"Guseinov, R. (2020). <i>Computational design of curved thin shells: From glass façades to programmable matter</i>. Institute of Science and Technology Austria. <a href=\"https://doi.org/10.15479/AT:ISTA:8366\">https://doi.org/10.15479/AT:ISTA:8366</a>","mla":"Guseinov, Ruslan. <i>Computational Design of Curved Thin Shells: From Glass Façades to Programmable Matter</i>. Institute of Science and Technology Austria, 2020, doi:<a href=\"https://doi.org/10.15479/AT:ISTA:8366\">10.15479/AT:ISTA:8366</a>.","ista":"Guseinov R. 2020. Computational design of curved thin shells: From glass façades to programmable matter. Institute of Science and Technology Austria.","chicago":"Guseinov, Ruslan. “Computational Design of Curved Thin Shells: From Glass Façades to Programmable Matter.” Institute of Science and Technology Austria, 2020. <a href=\"https://doi.org/10.15479/AT:ISTA:8366\">https://doi.org/10.15479/AT:ISTA:8366</a>.","ieee":"R. Guseinov, “Computational design of curved thin shells: From glass façades to programmable matter,” Institute of Science and Technology Austria, 2020.","short":"R. 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Guseinov, (2020).","chicago":"Guseinov, Ruslan. “Supplementary Data for ‘Computational Design of Curved Thin Shells: From Glass Façades to Programmable Matter.’” Institute of Science and Technology Austria, 2020. <a href=\"https://doi.org/10.15479/AT:ISTA:8375\">https://doi.org/10.15479/AT:ISTA:8375</a>.","ieee":"R. Guseinov, “Supplementary data for ‘Computational design of curved thin shells: from glass façades to programmable matter.’” Institute of Science and Technology Austria, 2020.","apa":"Guseinov, R. (2020). Supplementary data for “Computational design of curved thin shells: from glass façades to programmable matter.” Institute of Science and Technology Austria. <a href=\"https://doi.org/10.15479/AT:ISTA:8375\">https://doi.org/10.15479/AT:ISTA:8375</a>","ista":"Guseinov R. 2020. 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Zhang, Structure-Aware Computational Design and Its Application to 3D Printable Volume Scattering, Mechanism, and Multistability, Institute of Science and Technology Austria, 2020.","ieee":"R. Zhang, “Structure-aware computational design and its application to 3D printable volume scattering, mechanism, and multistability,” Institute of Science and Technology Austria, 2020.","chicago":"Zhang, Ran. “Structure-Aware Computational Design and Its Application to 3D Printable Volume Scattering, Mechanism, and Multistability.” Institute of Science and Technology Austria, 2020. <a href=\"https://doi.org/10.15479/AT:ISTA:8386\">https://doi.org/10.15479/AT:ISTA:8386</a>.","mla":"Zhang, Ran. <i>Structure-Aware Computational Design and Its Application to 3D Printable Volume Scattering, Mechanism, and Multistability</i>. Institute of Science and Technology Austria, 2020, doi:<a href=\"https://doi.org/10.15479/AT:ISTA:8386\">10.15479/AT:ISTA:8386</a>.","ista":"Zhang R. 2020. Structure-aware computational design and its application to 3D printable volume scattering, mechanism, and multistability. Institute of Science and Technology Austria.","apa":"Zhang, R. (2020). <i>Structure-aware computational design and its application to 3D printable volume scattering, mechanism, and multistability</i>. Institute of Science and Technology Austria. <a href=\"https://doi.org/10.15479/AT:ISTA:8386\">https://doi.org/10.15479/AT:ISTA:8386</a>","ama":"Zhang R. Structure-aware computational design and its application to 3D printable volume scattering, mechanism, and multistability. 2020. doi:<a href=\"https://doi.org/10.15479/AT:ISTA:8386\">10.15479/AT:ISTA:8386</a>"},"related_material":{"record":[{"relation":"part_of_dissertation","status":"public","id":"486"},{"status":"public","id":"1002","relation":"part_of_dissertation"}]},"date_updated":"2023-09-22T09:49:31Z","abstract":[{"text":"Form versus function is a long-standing debate in various design-related fields, such as architecture as well as graphic and industrial design. A good design that balances form and function often requires considerable human effort and collaboration among experts from different professional fields. Computational design tools provide a new paradigm for designing functional objects. In computational design, form and function are represented as mathematical\r\nquantities, with the help of numerical and combinatorial algorithms, they can assist even novice users in designing versatile models that exhibit their desired functionality. This thesis presents three disparate research studies on the computational design of functional objects: The appearance of 3d print—we optimize the volumetric material distribution for faithfully replicating colored surface texture in 3d printing; the dynamic motion of mechanical structures—\r\nour design system helps the novice user to retarget various mechanical templates with different functionality to complex 3d shapes; and a more abstract functionality, multistability—our algorithm automatically generates models that exhibit multiple stable target poses. For each of these cases, our computational design tools not only ensure the functionality of the results but also permit the user aesthetic freedom over the form. Moreover, fabrication constraints\r\nwere taken into account, which allow for the immediate creation of physical realization via 3D printing or laser cutting.","lang":"eng"}],"month":"09","oa_version":"Published Version","type":"dissertation","page":"148","date_created":"2020-09-14T01:04:53Z","file_date_updated":"2020-09-15T12:51:53Z","year":"2020","acknowledgement":"The research in this thesis has received funding from the European Union’s Horizon 2020 research and innovation programme, under the Marie Skłodowska-Curie grant agreement No 642841 (DISTRO) and the European Research Council grant agreement No 715767 (MATERIALIZABLE). All the research projects in this thesis were also supported by Scientific Service Units (SSUs) at IST Austria.","_id":"8386"},{"status":"public","external_id":{"arxiv":["2009.03667"],"isi":["000595589100048"]},"related_material":{"record":[{"status":"public","id":"8366","relation":"dissertation_contains"},{"id":"8761","status":"public","relation":"research_data"}],"link":[{"relation":"press_release","url":"https://ist.ac.at/en/news/bend-dont-break/","description":"News on IST Homepage"}]},"intvolume":"        39","citation":{"apa":"Gavriil, K., Guseinov, R., Perez Rodriguez, J., Pellis, D., Henderson, P. M., Rist, F., … Bickel, B. (2020). Computational design of cold bent glass façades. <i>ACM Transactions on Graphics</i>. Association for Computing Machinery. <a href=\"https://doi.org/10.1145/3414685.3417843\">https://doi.org/10.1145/3414685.3417843</a>","mla":"Gavriil, Konstantinos, et al. “Computational Design of Cold Bent Glass Façades.” <i>ACM Transactions on Graphics</i>, vol. 39, no. 6, 208, Association for Computing Machinery, 2020, doi:<a href=\"https://doi.org/10.1145/3414685.3417843\">10.1145/3414685.3417843</a>.","ista":"Gavriil K, Guseinov R, Perez Rodriguez J, Pellis D, Henderson PM, Rist F, Pottmann H, Bickel B. 2020. Computational design of cold bent glass façades. ACM Transactions on Graphics. 39(6), 208.","ama":"Gavriil K, Guseinov R, Perez Rodriguez J, et al. Computational design of cold bent glass façades. <i>ACM Transactions on Graphics</i>. 2020;39(6). doi:<a href=\"https://doi.org/10.1145/3414685.3417843\">10.1145/3414685.3417843</a>","short":"K. Gavriil, R. Guseinov, J. Perez Rodriguez, D. Pellis, P.M. Henderson, F. Rist, H. Pottmann, B. Bickel, ACM Transactions on Graphics 39 (2020).","chicago":"Gavriil, Konstantinos, Ruslan Guseinov, Jesus Perez Rodriguez, Davide Pellis, Paul M Henderson, Florian Rist, Helmut Pottmann, and Bernd Bickel. “Computational Design of Cold Bent Glass Façades.” <i>ACM Transactions on Graphics</i>. Association for Computing Machinery, 2020. <a href=\"https://doi.org/10.1145/3414685.3417843\">https://doi.org/10.1145/3414685.3417843</a>.","ieee":"K. Gavriil <i>et al.</i>, “Computational design of cold bent glass façades,” <i>ACM Transactions on Graphics</i>, vol. 39, no. 6. Association for Computing Machinery, 2020."},"oa":1,"publication_status":"published","has_accepted_license":"1","date_published":"2020-11-26T00:00:00Z","ddc":["000"],"acknowledged_ssus":[{"_id":"ScienComp"}],"acknowledgement":"We thank IST Austria’s Scientific Computing team for their support, Corinna Datsiou and Sophie Pennetier for their expert input on the practical applications of cold bent glass, and Zaha Hadid Architects and Waagner Biro for providing the architectural datasets. Photo of Fondation Louis Vuitton by Francisco Anzola / CC BY 2.0 / cropped.\r\nPhoto of Opus by Danica O. Kus. This project has received funding from the European Union’s\r\nHorizon 2020 research and innovation program under grant agreement No 675789 - Algebraic Representations in Computer-Aided Design for complEx Shapes (ARCADES), from the European Research Council (ERC) under grant agreement No 715767 - MATERIALIZABLE: Intelligent fabrication-oriented Computational Design and Modeling, and SFB-Transregio “Discretization in Geometry and Dynamics” through grant I 2978 of the Austrian Science Fund (FWF). F. Rist and K. Gavriil have been partially supported by KAUST baseline funding.","year":"2020","_id":"8562","month":"11","oa_version":"Submitted Version","type":"journal_article","abstract":[{"lang":"eng","text":"Cold bent glass is a promising and cost-efficient method for realizing doubly curved glass facades. They are produced by attaching planar glass sheets to curved frames and require keeping the occurring stress within safe limits.\r\nHowever, it is very challenging to navigate the design space of cold bent glass panels due to the fragility of the material, which impedes the form-finding for practically feasible and aesthetically pleasing cold bent glass facades. We propose an interactive, data-driven approach for designing cold bent glass facades that can be seamlessly integrated into a typical architectural design pipeline. Our method allows non-expert users to interactively edit a parametric surface while providing real-time feedback on the deformed shape and maximum stress of cold bent glass panels. Designs are automatically refined to minimize several fairness criteria while maximal stresses are kept within glass limits. We achieve interactive frame rates by using a differentiable Mixture Density Network trained from more than a million simulations. Given a curved boundary, our regression model is capable of handling multistable\r\nconfigurations and accurately predicting the equilibrium shape of the panel and its corresponding maximal stress. We show predictions are highly accurate and validate our results with a physical realization of a cold bent glass surface."}],"date_updated":"2024-02-21T12:43:21Z","volume":39,"file_date_updated":"2023-05-23T20:54:43Z","date_created":"2020-09-23T11:30:02Z","project":[{"grant_number":"715767","name":"MATERIALIZABLE: Intelligent fabrication-oriented Computational Design and Modeling","call_identifier":"H2020","_id":"24F9549A-B435-11E9-9278-68D0E5697425"}],"isi":1,"issue":"6","language":[{"iso":"eng"}],"publication_identifier":{"issn":["0730-0301"],"eissn":["1557-7368"]},"doi":"10.1145/3414685.3417843","quality_controlled":"1","user_id":"4359f0d1-fa6c-11eb-b949-802e58b17ae8","publisher":"Association for Computing Machinery","department":[{"_id":"BeBi"}],"publication":"ACM Transactions on Graphics","article_type":"original","ec_funded":1,"article_processing_charge":"No","scopus_import":"1","author":[{"first_name":"Konstantinos","last_name":"Gavriil","full_name":"Gavriil, Konstantinos"},{"full_name":"Guseinov, Ruslan","id":"3AB45EE2-F248-11E8-B48F-1D18A9856A87","orcid":"0000-0001-9819-5077","first_name":"Ruslan","last_name":"Guseinov"},{"last_name":"Perez Rodriguez","first_name":"Jesus","id":"2DC83906-F248-11E8-B48F-1D18A9856A87","full_name":"Perez Rodriguez, Jesus"},{"first_name":"Davide","last_name":"Pellis","full_name":"Pellis, Davide"},{"first_name":"Paul M","last_name":"Henderson","full_name":"Henderson, Paul M","id":"13C09E74-18D9-11E9-8878-32CFE5697425","orcid":"0000-0002-5198-7445"},{"last_name":"Rist","first_name":"Florian","full_name":"Rist, Florian"},{"first_name":"Helmut","last_name":"Pottmann","full_name":"Pottmann, Helmut"},{"orcid":"0000-0001-6511-9385","id":"49876194-F248-11E8-B48F-1D18A9856A87","full_name":"Bickel, Bernd","last_name":"Bickel","first_name":"Bernd"}],"file":[{"date_created":"2023-05-23T20:54:43Z","access_level":"open_access","date_updated":"2023-05-23T20:54:43Z","file_id":"13084","checksum":"c7f67717ad74e670b7daeae732abe151","relation":"main_file","content_type":"application/pdf","file_size":28964641,"creator":"bbickel","success":1,"file_name":"coldglass.pdf"}],"day":"26","article_number":"208","arxiv":1,"title":"Computational design of cold bent glass façades"},{"oa":1,"has_accepted_license":"1","ddc":["000"],"contributor":[{"last_name":"Gavriil","contributor_type":"researcher","first_name":"Konstantinos"},{"orcid":"0000-0001-9819-5077","id":"3AB45EE2-F248-11E8-B48F-1D18A9856A87","last_name":"Guseinov","first_name":"Ruslan","contributor_type":"researcher"},{"last_name":"Perez Rodriguez","first_name":"Jesus","contributor_type":"researcher","id":"2DC83906-F248-11E8-B48F-1D18A9856A87"},{"last_name":"Pellis","contributor_type":"researcher","first_name":"Davide"},{"id":"13C09E74-18D9-11E9-8878-32CFE5697425","orcid":"0000-0002-5198-7445","last_name":"Henderson","first_name":"Paul M","contributor_type":"researcher"},{"first_name":"Florian","contributor_type":"researcher","last_name":"Rist"},{"first_name":"Helmut","contributor_type":"researcher","last_name":"Pottmann"},{"last_name":"Bickel","first_name":"Bernd","contributor_type":"researcher","id":"49876194-F248-11E8-B48F-1D18A9856A87","orcid":"0000-0001-6511-9385"}],"doi":"10.15479/AT:ISTA:8761","date_published":"2020-11-23T00:00:00Z","acknowledged_ssus":[{"_id":"ScienComp"}],"project":[{"grant_number":"715767","name":"MATERIALIZABLE: Intelligent fabrication-oriented Computational Design and Modeling","_id":"24F9549A-B435-11E9-9278-68D0E5697425","call_identifier":"H2020"}],"status":"public","related_material":{"record":[{"status":"public","id":"8562","relation":"used_in_publication"}],"link":[{"url":"https://github.com/russelmann/cold-glass-acm","relation":"software"}]},"citation":{"ama":"Guseinov R. 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Guseinov, “Supplementary data for ‘Computational design of cold bent glass façades.’” Institute of Science and Technology Austria, 2020.","chicago":"Guseinov, Ruslan. “Supplementary Data for ‘Computational Design of Cold Bent Glass Façades.’” Institute of Science and Technology Austria, 2020. <a href=\"https://doi.org/10.15479/AT:ISTA:8761\">https://doi.org/10.15479/AT:ISTA:8761</a>.","short":"R. Guseinov, (2020)."},"author":[{"last_name":"Guseinov","first_name":"Ruslan","full_name":"Guseinov, Ruslan","id":"3AB45EE2-F248-11E8-B48F-1D18A9856A87","orcid":"0000-0001-9819-5077"}],"date_updated":"2024-02-21T12:43:22Z","day":"23","file":[{"checksum":"f5ae57b97017b9f61081032703361233","date_updated":"2020-11-16T10:31:29Z","file_id":"8762","access_level":"open_access","date_created":"2020-11-16T10:31:29Z","success":1,"file_name":"mdn_model.tar.gz","creator":"rguseino","relation":"main_file","content_type":"application/x-gzip","file_size":15378270},{"file_name":"optimal_panels_data.tar.gz","success":1,"file_size":615387734,"content_type":"application/x-gzip","relation":"main_file","creator":"rguseino","file_id":"8763","date_updated":"2020-11-16T10:43:23Z","checksum":"b0d25e04060ee78c585ee2f23542c744","date_created":"2020-11-16T10:43:23Z","access_level":"open_access"},{"relation":"main_file","content_type":"text/plain","file_size":1228,"creator":"rguseino","success":1,"file_name":"readme.txt","date_created":"2020-11-18T10:04:59Z","access_level":"open_access","date_updated":"2020-11-18T10:04:59Z","file_id":"8770","checksum":"69c1dde3434ada86d125e0c2588caf1e"}],"type":"research_data","oa_version":"Published Version","month":"11","title":"Supplementary data for \"Computational design of cold bent glass façades\"","date_created":"2020-11-16T10:47:18Z","file_date_updated":"2020-11-18T10:04:59Z","user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","publisher":"Institute of Science and Technology Austria","department":[{"_id":"BeBi"}],"year":"2020","_id":"8761","ec_funded":1,"article_processing_charge":"No","tmp":{"legal_code_url":"https://creativecommons.org/licenses/by/4.0/legalcode","image":"/images/cc_by.png","name":"Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)","short":"CC BY (4.0)"}},{"project":[{"grant_number":"638176","_id":"2533E772-B435-11E9-9278-68D0E5697425","call_identifier":"H2020","name":"Efficient Simulation of Natural Phenomena at Extremely Large Scales"},{"call_identifier":"H2020","_id":"24F9549A-B435-11E9-9278-68D0E5697425","name":"MATERIALIZABLE: Intelligent fabrication-oriented Computational Design and Modeling","grant_number":"715767"}],"language":[{"iso":"eng"}],"issue":"8","isi":1,"conference":{"name":"SCA: Symposium on Computer Animation","location":"Online Symposium","start_date":"2020-10-06","end_date":"2020-10-09"},"quality_controlled":"1","doi":"10.1111/cgf.14100","department":[{"_id":"ChWo"},{"_id":"BeBi"}],"publisher":"Wiley","user_id":"2EBD1598-F248-11E8-B48F-1D18A9856A87","article_processing_charge":"No","scopus_import":"1","ec_funded":1,"article_type":"original","publication":"Computer Graphics forum","day":"01","author":[{"first_name":"Stefan","last_name":"Jeschke","id":"44D6411A-F248-11E8-B48F-1D18A9856A87","full_name":"Jeschke, Stefan"},{"id":"400429CC-F248-11E8-B48F-1D18A9856A87","full_name":"Hafner, Christian","first_name":"Christian","last_name":"Hafner"},{"first_name":"Nuttapong","last_name":"Chentanez","full_name":"Chentanez, Nuttapong"},{"full_name":"Macklin, Miles","first_name":"Miles","last_name":"Macklin"},{"full_name":"Müller-Fischer, Matthias","first_name":"Matthias","last_name":"Müller-Fischer"},{"orcid":"0000-0001-6646-5546","id":"3C61F1D2-F248-11E8-B48F-1D18A9856A87","full_name":"Wojtan, Christopher J","last_name":"Wojtan","first_name":"Christopher J"}],"title":"Making procedural water waves boundary-aware","external_id":{"isi":["000591780400005"]},"status":"public","citation":{"apa":"Jeschke, S., Hafner, C., Chentanez, N., Macklin, M., Müller-Fischer, M., &#38; Wojtan, C. (2020). Making procedural water waves boundary-aware. <i>Computer Graphics Forum</i>. Online Symposium: Wiley. <a href=\"https://doi.org/10.1111/cgf.14100\">https://doi.org/10.1111/cgf.14100</a>","ista":"Jeschke S, Hafner C, Chentanez N, Macklin M, Müller-Fischer M, Wojtan C. 2020. Making procedural water waves boundary-aware. Computer Graphics forum. 39(8), 47–54.","mla":"Jeschke, Stefan, et al. “Making Procedural Water Waves Boundary-Aware.” <i>Computer Graphics Forum</i>, vol. 39, no. 8, Wiley, 2020, pp. 47–54, doi:<a href=\"https://doi.org/10.1111/cgf.14100\">10.1111/cgf.14100</a>.","ama":"Jeschke S, Hafner C, Chentanez N, Macklin M, Müller-Fischer M, Wojtan C. Making procedural water waves boundary-aware. <i>Computer Graphics forum</i>. 2020;39(8):47-54. doi:<a href=\"https://doi.org/10.1111/cgf.14100\">10.1111/cgf.14100</a>","short":"S. Jeschke, C. Hafner, N. Chentanez, M. Macklin, M. Müller-Fischer, C. Wojtan, Computer Graphics Forum 39 (2020) 47–54.","chicago":"Jeschke, Stefan, Christian Hafner, Nuttapong Chentanez, Miles Macklin, Matthias Müller-Fischer, and Chris Wojtan. “Making Procedural Water Waves Boundary-Aware.” <i>Computer Graphics Forum</i>. Wiley, 2020. <a href=\"https://doi.org/10.1111/cgf.14100\">https://doi.org/10.1111/cgf.14100</a>.","ieee":"S. Jeschke, C. Hafner, N. Chentanez, M. Macklin, M. Müller-Fischer, and C. Wojtan, “Making procedural water waves boundary-aware,” <i>Computer Graphics forum</i>, vol. 39, no. 8. Wiley, pp. 47–54, 2020."},"intvolume":"        39","publication_status":"published","date_published":"2020-12-01T00:00:00Z","year":"2020","_id":"8766","date_updated":"2024-02-28T13:58:11Z","abstract":[{"text":"The “procedural” approach to animating ocean waves is the dominant algorithm for animating larger bodies of water in\r\ninteractive applications as well as in off-line productions — it provides high visual quality with a low computational demand. In this paper, we widen the applicability of procedural water wave animation with an extension that guarantees the satisfaction of boundary conditions imposed by terrain while still approximating physical wave behavior. In combination with a particle system that models wave breaking, foam, and spray, this allows us to naturally model waves interacting with beaches and rocks. Our system is able to animate waves at large scales at interactive frame rates on a commodity PC.","lang":"eng"}],"type":"journal_article","month":"12","oa_version":"None","page":"47-54","date_created":"2020-11-17T10:47:48Z","volume":39}]