[{"article_number":"168","title":"Procedural metamaterials: A unified procedural graph for metamaterial design","day":"01","file":[{"access_level":"open_access","date_created":"2023-11-29T15:16:01Z","checksum":"0192f597d7a2ceaf89baddfd6190d4c8","file_id":"14630","date_updated":"2023-11-29T15:16:01Z","creator":"yichen","file_size":95467870,"content_type":"application/zip","relation":"main_file","file_name":"tog-22-0089-File004.zip","success":1},{"file_size":103731880,"content_type":"application/zip","relation":"main_file","creator":"yichen","file_name":"tog-22-0089-File005.zip","success":1,"date_created":"2023-11-29T15:16:01Z","access_level":"open_access","file_id":"14631","date_updated":"2023-11-29T15:16:01Z","checksum":"7fb024963be81933494f38de191e4710"},{"creator":"dernst","relation":"main_file","content_type":"application/pdf","file_size":57067476,"success":1,"file_name":"2023_ACMToG_Makatura.pdf","access_level":"open_access","date_created":"2023-12-04T08:04:14Z","checksum":"b7d6829ce396e21cac9fae0ec7130a6b","date_updated":"2023-12-04T08:04:14Z","file_id":"14638"}],"author":[{"first_name":"Liane","last_name":"Makatura","full_name":"Makatura, Liane"},{"full_name":"Wang, Bohan","first_name":"Bohan","last_name":"Wang"},{"last_name":"Chen","first_name":"Yi-Lu","id":"0b467602-dbcd-11ea-9d1d-ed480aa46b70","full_name":"Chen, Yi-Lu"},{"full_name":"Deng, Bolei","first_name":"Bolei","last_name":"Deng"},{"orcid":"0000-0001-6646-5546","id":"3C61F1D2-F248-11E8-B48F-1D18A9856A87","full_name":"Wojtan, Christopher J","last_name":"Wojtan","first_name":"Christopher J"},{"full_name":"Bickel, Bernd","orcid":"0000-0001-6511-9385","id":"49876194-F248-11E8-B48F-1D18A9856A87","last_name":"Bickel","first_name":"Bernd"},{"full_name":"Matusik, Wojciech","first_name":"Wojciech","last_name":"Matusik"}],"article_type":"original","article_processing_charge":"Yes (in subscription journal)","publication":"ACM Transactions on Graphics","department":[{"_id":"GradSch"},{"_id":"ChWo"},{"_id":"BeBi"}],"user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","publisher":"Association for Computing Machinery","quality_controlled":"1","doi":"10.1145/3605389","publication_identifier":{"issn":["0730-0301","1557-7368"]},"issue":"5","language":[{"iso":"eng"}],"keyword":["Computer Graphics and Computer-Aided Design"],"project":[{"grant_number":"101045083","name":"Computational Discovery of Numerical Algorithms for Animation and Simulation of Natural Phenomena","_id":"34bc2376-11ca-11ed-8bc3-9a3b3961a088"}],"file_date_updated":"2023-12-04T08:04:14Z","date_created":"2023-11-29T15:02:03Z","volume":42,"month":"10","oa_version":"Published Version","type":"journal_article","abstract":[{"lang":"eng","text":"We introduce a compact, intuitive procedural graph representation for cellular metamaterials, which are small-scale, tileable structures that can be architected to exhibit many useful material properties. Because the structures’ “architectures” vary widely—with elements such as beams, thin shells, and solid bulks—it is difficult to explore them using existing representations. Generic approaches like voxel grids are versatile, but it is cumbersome to represent and edit individual structures; architecture-specific approaches address these issues, but are incompatible with one another. By contrast, our procedural graph succinctly represents the construction process for any structure using a simple skeleton annotated with spatially varying thickness. To express the highly constrained triply periodic minimal surfaces (TPMS) in this manner, we present the first fully automated version of the conjugate surface construction method, which allows novices to create complex TPMS from intuitive input. We demonstrate our representation’s expressiveness, accuracy, and compactness by constructing a wide range of established structures and hundreds of novel structures with diverse architectures and material properties. We also conduct a user study to verify our representation’s ease-of-use and ability to expand engineers’ capacity for exploration."}],"date_updated":"2023-12-04T08:09:05Z","_id":"14628","year":"2023","acknowledgement":"The authors thank Mina Konaković Luković and Michael Foshey for their early contributions to this project, David Palmer and Paul Zhang for their insightful discussions about minimal surfaces and the CSCM, Julian Panetta for providing the Elastic Textures code, and Hannes Hergeth for his feedback and support. We also thank our user study participants and anonymous reviewers.\r\nThis material is based upon work supported by the National Science Foundation\r\n(NSF) Graduate Research Fellowship under Grant No. 2141064; the MIT Morningside\r\nAcademy for Design Fellowship; the Defense Advanced Research Projects Agency\r\n(DARPA) Grant No. FA8750-20-C-0075; the ERC Consolidator Grant No. 101045083,\r\n“CoDiNA: Computational Discovery of Numerical Algorithms for Animation and Simulation of Natural Phenomena”; and the NewSat project, which is co-funded by the Operational Program for Competitiveness and Internationalisation (COMPETE2020), Portugal 2020, the European Regional Development Fund (ERDF), and the Portuguese Foundation for Science and Technology (FTC) under the MIT Portugal program.","ddc":["531","006"],"date_published":"2023-10-01T00:00:00Z","has_accepted_license":"1","publication_status":"published","oa":1,"citation":{"chicago":"Makatura, Liane, Bohan Wang, Yi-Lu Chen, Bolei Deng, Chris Wojtan, Bernd Bickel, and Wojciech Matusik. “Procedural Metamaterials: A Unified Procedural Graph for Metamaterial Design.” <i>ACM Transactions on Graphics</i>. Association for Computing Machinery, 2023. <a href=\"https://doi.org/10.1145/3605389\">https://doi.org/10.1145/3605389</a>.","ieee":"L. Makatura <i>et al.</i>, “Procedural metamaterials: A unified procedural graph for metamaterial design,” <i>ACM Transactions on Graphics</i>, vol. 42, no. 5. Association for Computing Machinery, 2023.","short":"L. Makatura, B. Wang, Y.-L. Chen, B. Deng, C. Wojtan, B. Bickel, W. Matusik, ACM Transactions on Graphics 42 (2023).","ama":"Makatura L, Wang B, Chen Y-L, et al. Procedural metamaterials: A unified procedural graph for metamaterial design. <i>ACM Transactions on Graphics</i>. 2023;42(5). doi:<a href=\"https://doi.org/10.1145/3605389\">10.1145/3605389</a>","apa":"Makatura, L., Wang, B., Chen, Y.-L., Deng, B., Wojtan, C., Bickel, B., &#38; Matusik, W. (2023). Procedural metamaterials: A unified procedural graph for metamaterial design. <i>ACM Transactions on Graphics</i>. Association for Computing Machinery. <a href=\"https://doi.org/10.1145/3605389\">https://doi.org/10.1145/3605389</a>","mla":"Makatura, Liane, et al. “Procedural Metamaterials: A Unified Procedural Graph for Metamaterial Design.” <i>ACM Transactions on Graphics</i>, vol. 42, no. 5, 168, Association for Computing Machinery, 2023, doi:<a href=\"https://doi.org/10.1145/3605389\">10.1145/3605389</a>.","ista":"Makatura L, Wang B, Chen Y-L, Deng B, Wojtan C, Bickel B, Matusik W. 2023. Procedural metamaterials: A unified procedural graph for metamaterial design. ACM Transactions on Graphics. 42(5), 168."},"intvolume":"        42","status":"public"},{"article_type":"original","ec_funded":1,"article_processing_charge":"No","publication":"ACM Transactions on Graphics","department":[{"_id":"BeBi"}],"user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","publisher":"Association for Computing Machinery","article_number":"171","title":"The design space of Kirchhoff rods","file":[{"access_level":"open_access","date_created":"2023-07-04T08:11:28Z","checksum":"4954c1cfa487725bc156dcfec872478a","date_updated":"2023-07-04T08:11:28Z","file_id":"13194","creator":"chafner","relation":"main_file","content_type":"application/pdf","file_size":19635168,"success":1,"file_name":"kirchhoff-rods.pdf"},{"file_name":"supp-main.pdf","relation":"supplementary_material","content_type":"application/pdf","file_size":420909,"creator":"chafner","date_updated":"2023-07-04T07:46:28Z","file_id":"13190","checksum":"79c9975fbc82ff71f1767331d2204cca","date_created":"2023-07-04T07:46:28Z","title":"Supplemental Material with Proofs","access_level":"open_access"},{"title":"Cheat Sheet for Notation","access_level":"open_access","date_created":"2023-07-04T07:46:30Z","checksum":"4ab647e4f03c711e1e6a5fc1eb8684db","file_id":"13191","date_updated":"2023-07-04T07:46:30Z","creator":"chafner","file_size":430086,"content_type":"application/pdf","relation":"supplementary_material","file_name":"supp-cheat.pdf"},{"relation":"supplementary_material","content_type":"video/mp4","file_size":268088064,"creator":"chafner","file_name":"kirchhoff-video-final.mp4","date_created":"2023-07-04T07:46:39Z","title":"Supplemental Video","access_level":"open_access","date_updated":"2023-07-04T07:46:39Z","file_id":"13192","checksum":"c0fd9a57d012046de90c185ffa904b76"},{"file_name":"matlab-submission.zip","file_size":25790,"content_type":"application/x-zip-compressed","relation":"supplementary_material","creator":"chafner","file_id":"13193","date_updated":"2023-07-04T07:47:10Z","checksum":"71b00712b489ada2cd9815910ee180a9","date_created":"2023-07-04T07:47:10Z","access_level":"open_access","title":"Matlab Source Code with Example"}],"day":"20","author":[{"last_name":"Hafner","first_name":"Christian","full_name":"Hafner, Christian","id":"400429CC-F248-11E8-B48F-1D18A9856A87"},{"id":"49876194-F248-11E8-B48F-1D18A9856A87","orcid":"0000-0001-6511-9385","full_name":"Bickel, Bernd","first_name":"Bernd","last_name":"Bickel"}],"issue":"5","language":[{"iso":"eng"}],"keyword":["Computer Graphics","Computational Design","Computational Geometry","Shape Modeling"],"isi":1,"project":[{"name":"MATERIALIZABLE: Intelligent fabrication-oriented Computational Design and Modeling","_id":"24F9549A-B435-11E9-9278-68D0E5697425","call_identifier":"H2020","grant_number":"715767"}],"quality_controlled":"1","doi":"10.1145/3606033","publication_identifier":{"eissn":["1557-7368"],"issn":["0730-0301"]},"_id":"13188","year":"2023","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).","file_date_updated":"2023-07-04T08:11:28Z","date_created":"2023-07-04T07:41:30Z","volume":42,"type":"journal_article","month":"09","oa_version":"Submitted Version","date_updated":"2024-03-25T23:30:26Z","abstract":[{"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.","lang":"eng"}],"citation":{"chicago":"Hafner, Christian, and Bernd Bickel. “The Design Space of Kirchhoff Rods.” <i>ACM Transactions on Graphics</i>. Association for Computing Machinery, 2023. <a href=\"https://doi.org/10.1145/3606033\">https://doi.org/10.1145/3606033</a>.","ieee":"C. Hafner and B. Bickel, “The design space of Kirchhoff rods,” <i>ACM Transactions on Graphics</i>, vol. 42, no. 5. Association for Computing Machinery, 2023.","short":"C. Hafner, B. Bickel, ACM Transactions on Graphics 42 (2023).","ama":"Hafner C, Bickel B. 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>","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>.","ista":"Hafner C, Bickel B. 2023. The design space of Kirchhoff rods. ACM Transactions on Graphics. 42(5), 171."},"related_material":{"record":[{"relation":"part_of_dissertation","status":"public","id":"12897"}]},"intvolume":"        42","status":"public","external_id":{"isi":["001086833300010"]},"acknowledged_ssus":[{"_id":"M-Shop"}],"ddc":["516"],"date_published":"2023-09-20T00:00:00Z","has_accepted_license":"1","publication_status":"published","oa":1},{"user_id":"4359f0d1-fa6c-11eb-b949-802e58b17ae8","publisher":"Wiley","department":[{"_id":"BeBi"}],"publication":"Computer Graphics Forum","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,"author":[{"first_name":"Zhenyuan","last_name":"Liu","full_name":"Liu, Zhenyuan","orcid":"0000-0001-9200-5690","id":"70f0d7cf-ae65-11ec-a14f-89dfc5505b19"},{"first_name":"Michael","last_name":"Piovarci","full_name":"Piovarci, Michael","id":"62E473F4-5C99-11EA-A40E-AF823DDC885E"},{"full_name":"Hafner, Christian","id":"400429CC-F248-11E8-B48F-1D18A9856A87","first_name":"Christian","last_name":"Hafner"},{"last_name":"Charrondiere","first_name":"Raphael","id":"a3a24133-2cc7-11ec-be88-8ddaf6f464b1","full_name":"Charrondiere, Raphael"},{"first_name":"Bernd","last_name":"Bickel","full_name":"Bickel, Bernd","orcid":"0000-0001-6511-9385","id":"49876194-F248-11E8-B48F-1D18A9856A87"}],"day":"08","file":[{"file_name":"Zhenyuan2023.pdf","success":1,"file_size":24003702,"content_type":"application/pdf","relation":"main_file","creator":"mpiovarc","file_id":"12974","date_updated":"2023-05-16T08:28:37Z","checksum":"4c188c2be4745467a8790bbf5d6491aa","date_created":"2023-05-16T08:28:37Z","access_level":"open_access"}],"title":"Directionality-aware design of embroidery patterns","project":[{"name":"Perception-Aware Appearance Fabrication","_id":"eb901961-77a9-11ec-83b8-f5c883a62027","grant_number":"M03319"},{"call_identifier":"H2020","_id":"24F9549A-B435-11E9-9278-68D0E5697425","name":"MATERIALIZABLE: Intelligent fabrication-oriented Computational Design and Modeling","grant_number":"715767"}],"conference":{"location":"Saarbrucken, Germany","name":"EG: Eurographics","start_date":"2023-05-08","end_date":"2023-05-12"},"keyword":["embroidery","design","directionality","density","image"],"isi":1,"issue":"2","language":[{"iso":"eng"}],"publication_identifier":{"issn":["1467-8659"]},"doi":"10.1111/cgf.14770 ","quality_controlled":"1","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.","year":"2023","_id":"12972","page":"397-409","month":"05","oa_version":"Published Version","type":"journal_article","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","volume":42,"date_created":"2023-05-16T08:47:25Z","file_date_updated":"2023-05-16T08:28:37Z","external_id":{"isi":["001000062600033"]},"status":"public","intvolume":"        42","citation":{"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>","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.","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>.","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>","short":"Z. Liu, M. Piovarci, C. Hafner, R. Charrondiere, B. Bickel, Computer Graphics Forum 42 (2023) 397–409.","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>.","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."},"publication_status":"published","oa":1,"has_accepted_license":"1","ddc":["004"],"date_published":"2023-05-08T00:00:00Z"},{"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).","year":"2023","_id":"13049","abstract":[{"lang":"eng","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."}],"date_updated":"2024-01-29T10:30:49Z","month":"07","type":"journal_article","oa_version":"Submitted Version","volume":42,"date_created":"2023-05-22T08:37:04Z","file_date_updated":"2023-06-20T12:20:51Z","status":"public","external_id":{"isi":["001044671300108"]},"intvolume":"        42","citation":{"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).","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>"},"publication_status":"published","oa":1,"has_accepted_license":"1","ddc":["006"],"date_published":"2023-07-26T00:00:00Z","acknowledged_ssus":[{"_id":"M-Shop"}],"publisher":"Association for Computing Machinery","user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","department":[{"_id":"GradSch"},{"_id":"BeBi"}],"publication":"Transactions on Graphics","article_processing_charge":"No","ec_funded":1,"article_type":"original","author":[{"full_name":"Freire, Marco","first_name":"Marco","last_name":"Freire"},{"id":"FF8FA64C-AA6A-11E9-99AD-50D4E5697425","orcid":"0009-0007-6138-6890","full_name":"Bhargava, Manas","last_name":"Bhargava","first_name":"Manas"},{"first_name":"Camille","last_name":"Schreck","id":"2B14B676-F248-11E8-B48F-1D18A9856A87","full_name":"Schreck, Camille"},{"first_name":"Pierre-Alexandre","last_name":"Hugron","full_name":"Hugron, Pierre-Alexandre"},{"last_name":"Bickel","first_name":"Bernd","full_name":"Bickel, Bernd","id":"49876194-F248-11E8-B48F-1D18A9856A87","orcid":"0000-0001-6511-9385"},{"last_name":"Lefebvre","first_name":"Sylvain","full_name":"Lefebvre, Sylvain"}],"day":"26","file":[{"file_id":"13156","date_updated":"2023-06-19T11:02:23Z","checksum":"a0b0ba3b36f43a94388e8824613d812a","date_created":"2023-06-19T11:02:23Z","access_level":"open_access","file_name":"2023_ACMToG_Freire.pdf","success":1,"file_size":78940724,"content_type":"application/pdf","relation":"main_file","creator":"dernst"},{"file_size":34345905,"relation":"main_file","content_type":"application/pdf","creator":"dernst","file_name":"2023_ACMToG_SuppMaterial_Freire.pdf","success":1,"date_created":"2023-06-20T12:20:51Z","access_level":"open_access","file_id":"13157","date_updated":"2023-06-20T12:20:51Z","checksum":"b9206bbb67af82df49b7e7cdbde3410c"}],"title":"PCBend: Light up your 3D shapes with foldable circuit boards","article_number":"142","project":[{"grant_number":"715767","call_identifier":"H2020","_id":"24F9549A-B435-11E9-9278-68D0E5697425","name":"MATERIALIZABLE: Intelligent fabrication-oriented Computational Design and Modeling"}],"isi":1,"keyword":["PCB design and layout","Mesh geometry models"],"conference":{"end_date":"2023-08-10","start_date":"2023-08-06","location":"Los Angeles, CA, United States","name":"SIGGRAPH: Computer Graphics and Interactive Techniques Conference"},"language":[{"iso":"eng"}],"issue":"4","publication_identifier":{"eissn":["1557-7368"],"issn":["0730-0301"]},"doi":"10.1145/3592411","quality_controlled":"1"},{"publication":"Computer Graphics Forum","scopus_import":"1","article_processing_charge":"No","article_type":"original","user_id":"4359f0d1-fa6c-11eb-b949-802e58b17ae8","publisher":"Wiley","department":[{"_id":"BeBi"}],"title":"State of the art in computational mould design","author":[{"full_name":"Alderighi, Thomas","first_name":"Thomas","last_name":"Alderighi"},{"last_name":"Malomo","first_name":"Luigi","full_name":"Malomo, Luigi"},{"last_name":"Auzinger","first_name":"Thomas","orcid":"0000-0002-1546-3265","id":"4718F954-F248-11E8-B48F-1D18A9856A87","full_name":"Auzinger, Thomas"},{"full_name":"Bickel, Bernd","id":"49876194-F248-11E8-B48F-1D18A9856A87","orcid":"0000-0001-6511-9385","first_name":"Bernd","last_name":"Bickel"},{"last_name":"Cignoni","first_name":"Paulo","full_name":"Cignoni, Paulo"},{"full_name":"Pietroni, Nico","first_name":"Nico","last_name":"Pietroni"}],"file":[{"file_size":32480850,"content_type":"application/pdf","relation":"main_file","creator":"bbickel","file_name":"star_molding_preprint.pdf","date_created":"2022-08-28T18:18:08Z","title":"pre-peer reviewed version","access_level":"open_access","file_id":"11994","date_updated":"2022-08-28T18:18:08Z","checksum":"c40cc8ceb7b7f0512172b883d712198e","description":"This is the pre-peer reviewed version of the following article: Alderighi, T., Malomo, L., Auzinger, T., Bickel, B., Cignoni, P. and Pietroni, N. (2022), State of the Art in Computational Mould Design. Computer Graphics Forum, which has been published in final form at https://doi.org/10.1111/cgf.14581. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions."}],"day":"01","isi":1,"keyword":["Computer Graphics and Computer-Aided Design"],"language":[{"iso":"eng"}],"issue":"6","doi":"10.1111/cgf.14581","quality_controlled":"1","publication_identifier":{"eissn":["1467-8659"],"issn":["0167-7055"]},"_id":"11993","year":"2022","volume":41,"file_date_updated":"2022-08-28T18:18:08Z","date_created":"2022-08-28T18:17:01Z","page":"435-452","abstract":[{"text":"Moulding refers to a set of manufacturing techniques in which a mould, usually a cavity or a solid frame, is used to shape a liquid or pliable material into an object of the desired shape. The popularity of moulding comes from its effectiveness, scalability and versatility in terms of employed materials. Its relevance as a fabrication process is demonstrated by the extensive literature covering different aspects related to mould design, from material flow simulation to the automation of mould geometry design. In this state-of-the-art report, we provide an extensive review of the automatic methods for the design of moulds, focusing on contributions from a geometric perspective. We classify existing mould design methods based on their computational approach and the nature of their target moulding process. We summarize the relationships between computational approaches and moulding techniques, highlighting their strengths and limitations. Finally, we discuss potential future research directions.","lang":"eng"}],"date_updated":"2023-08-03T13:21:55Z","month":"09","oa_version":"Submitted Version","type":"journal_article","intvolume":"        41","citation":{"ista":"Alderighi T, Malomo L, Auzinger T, Bickel B, Cignoni P, Pietroni N. 2022. State of the art in computational mould design. Computer Graphics Forum. 41(6), 435–452.","mla":"Alderighi, Thomas, et al. “State of the Art in Computational Mould Design.” <i>Computer Graphics Forum</i>, vol. 41, no. 6, Wiley, 2022, pp. 435–52, doi:<a href=\"https://doi.org/10.1111/cgf.14581\">10.1111/cgf.14581</a>.","apa":"Alderighi, T., Malomo, L., Auzinger, T., Bickel, B., Cignoni, P., &#38; Pietroni, N. (2022). State of the art in computational mould design. <i>Computer Graphics Forum</i>. Wiley. <a href=\"https://doi.org/10.1111/cgf.14581\">https://doi.org/10.1111/cgf.14581</a>","ama":"Alderighi T, Malomo L, Auzinger T, Bickel B, Cignoni P, Pietroni N. State of the art in computational mould design. <i>Computer Graphics Forum</i>. 2022;41(6):435-452. doi:<a href=\"https://doi.org/10.1111/cgf.14581\">10.1111/cgf.14581</a>","short":"T. Alderighi, L. Malomo, T. Auzinger, B. Bickel, P. Cignoni, N. Pietroni, Computer Graphics Forum 41 (2022) 435–452.","ieee":"T. Alderighi, L. Malomo, T. Auzinger, B. Bickel, P. Cignoni, and N. Pietroni, “State of the art in computational mould design,” <i>Computer Graphics Forum</i>, vol. 41, no. 6. Wiley, pp. 435–452, 2022.","chicago":"Alderighi, Thomas, Luigi Malomo, Thomas Auzinger, Bernd Bickel, Paulo Cignoni, and Nico Pietroni. “State of the Art in Computational Mould Design.” <i>Computer Graphics Forum</i>. Wiley, 2022. <a href=\"https://doi.org/10.1111/cgf.14581\">https://doi.org/10.1111/cgf.14581</a>."},"status":"public","external_id":{"isi":["000842638900001"]},"date_published":"2022-09-01T00:00:00Z","ddc":["000"],"oa":1,"publication_status":"published","has_accepted_license":"1"},{"title":"Computational design of planar multistable compliant structures","article_number":"186","author":[{"full_name":"Zhang, Ran","orcid":"0000-0002-3808-281X","id":"4DDBCEB0-F248-11E8-B48F-1D18A9856A87","first_name":"Ran","last_name":"Zhang"},{"orcid":"0000-0002-1546-3265","id":"4718F954-F248-11E8-B48F-1D18A9856A87","full_name":"Auzinger, Thomas","first_name":"Thomas","last_name":"Auzinger"},{"first_name":"Bernd","last_name":"Bickel","orcid":"0000-0001-6511-9385","id":"49876194-F248-11E8-B48F-1D18A9856A87","full_name":"Bickel, Bernd"}],"day":"08","file":[{"file_name":"Multistable-authorversion.pdf","creator":"bbickel","content_type":"application/pdf","relation":"main_file","file_size":18926557,"checksum":"8564b3118457d4c8939a8ef2b1a2f16c","date_updated":"2021-05-08T17:36:59Z","file_id":"9377","access_level":"open_access","date_created":"2021-05-08T17:36:59Z"},{"access_level":"open_access","date_created":"2021-05-08T17:38:22Z","checksum":"3b6e874e30bfa1bfc3ad3498710145a1","file_id":"9378","date_updated":"2021-05-08T17:38:22Z","creator":"bbickel","file_size":76542901,"content_type":"video/mp4","relation":"main_file","file_name":"multistable-video.mp4","success":1},{"file_name":"multistable-supplementary material.pdf","file_size":3367072,"content_type":"application/pdf","relation":"supplementary_material","creator":"bbickel","file_id":"10562","date_updated":"2021-12-17T08:13:51Z","description":"This document provides additional results and analyzes the robustness and limitations of our approach.","checksum":"20dc3bc42e1a912a5b0247c116772098","date_created":"2021-12-17T08:13:51Z","access_level":"open_access","title":"Supplementary Material for “Computational Design of Planar Multistable Compliant Structures”"}],"publication":"ACM Transactions on Graphics","article_processing_charge":"No","ec_funded":1,"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","publisher":"Association for Computing Machinery","user_id":"4359f0d1-fa6c-11eb-b949-802e58b17ae8","department":[{"_id":"BeBi"}],"doi":"10.1145/3453477","quality_controlled":"1","publication_identifier":{"issn":["0730-0301"],"eissn":["1557-7368"]},"isi":1,"keyword":["multistability","mechanism","computational design","rigidity"],"language":[{"iso":"eng"}],"issue":"5","project":[{"grant_number":"642841","name":"Distributed 3D Object Design","_id":"2508E324-B435-11E9-9278-68D0E5697425","call_identifier":"H2020"},{"grant_number":"715767","name":"MATERIALIZABLE: Intelligent fabrication-oriented Computational Design and Modeling","_id":"24F9549A-B435-11E9-9278-68D0E5697425","call_identifier":"H2020"}],"volume":40,"file_date_updated":"2021-12-17T08:13:51Z","date_created":"2021-05-08T17:37:08Z","abstract":[{"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.","lang":"eng"}],"date_updated":"2023-08-08T13:31:38Z","oa_version":"Published Version","month":"10","type":"journal_article","_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","ddc":["000"],"date_published":"2021-10-08T00:00:00Z","acknowledged_ssus":[{"_id":"M-Shop"}],"oa":1,"publication_status":"published","has_accepted_license":"1","intvolume":"        40","citation":{"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>.","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.","short":"R. Zhang, T. Auzinger, B. Bickel, ACM Transactions on Graphics 40 (2021).","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>","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>","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>."},"external_id":{"isi":["000752079300003"]},"status":"public"},{"doi":"10.15479/AT:ISTA:8366","publication_identifier":{"isbn":["978-3-99078-010-7"],"issn":["2663-337X"]},"keyword":["computer-aided design","shape modeling","self-morphing","mechanical engineering"],"language":[{"iso":"eng"}],"project":[{"call_identifier":"H2020","_id":"24F9549A-B435-11E9-9278-68D0E5697425","name":"MATERIALIZABLE: Intelligent fabrication-oriented Computational Design and Modeling","grant_number":"715767"}],"title":"Computational design of curved thin shells: From glass façades to programmable matter","degree_awarded":"PhD","author":[{"last_name":"Guseinov","first_name":"Ruslan","orcid":"0000-0001-9819-5077","id":"3AB45EE2-F248-11E8-B48F-1D18A9856A87","full_name":"Guseinov, Ruslan"}],"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"},{"creator":"rguseino","relation":"source_file","content_type":"application/x-zip-compressed","file_size":76207597,"file_name":"thesis_source.zip","access_level":"closed","date_created":"2020-09-11T09:39:48Z","checksum":"e8fd944c960c20e0e27e6548af69121d","date_updated":"2020-09-16T15:11:01Z","file_id":"8374"}],"article_processing_charge":"No","ec_funded":1,"publisher":"Institute of Science and Technology Austria","user_id":"c635000d-4b10-11ee-a964-aac5a93f6ac1","department":[{"_id":"BeBi"}],"date_published":"2020-09-21T00:00:00Z","ddc":["000"],"supervisor":[{"full_name":"Bickel, Bernd","orcid":"0000-0001-6511-9385","id":"49876194-F248-11E8-B48F-1D18A9856A87","first_name":"Bernd","last_name":"Bickel"}],"acknowledged_ssus":[{"_id":"M-Shop"},{"_id":"ScienComp"}],"oa":1,"publication_status":"published","has_accepted_license":"1","related_material":{"record":[{"id":"7151","status":"deleted","relation":"research_data"},{"status":"public","id":"7262","relation":"part_of_dissertation"},{"relation":"part_of_dissertation","id":"8562","status":"public"},{"relation":"part_of_dissertation","status":"public","id":"1001"},{"id":"8375","status":"public","relation":"research_data"}]},"citation":{"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. Guseinov, Computational Design of Curved Thin Shells: From Glass Façades to Programmable Matter, Institute of Science and Technology Austria, 2020.","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>","ista":"Guseinov R. 2020. Computational design of curved thin shells: From glass façades to programmable matter. Institute of Science and Technology Austria.","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>."},"alternative_title":["ISTA Thesis"],"status":"public","file_date_updated":"2020-09-16T15:11:01Z","date_created":"2020-09-10T16:19:55Z","page":"118","month":"09","type":"dissertation","oa_version":"Published Version","date_updated":"2024-02-21T12:44:29Z","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."}],"_id":"8366","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.","year":"2020"},{"ddc":["000"],"date_published":"2020-01-13T00:00:00Z","oa":1,"publication_status":"published","has_accepted_license":"1","related_material":{"record":[{"relation":"dissertation_contains","status":"public","id":"8366"},{"id":"7154","status":"public","relation":"research_data"}],"link":[{"relation":"press_release","url":"https://ist.ac.at/en/news/geometry-meets-time/","description":"News on IST Homepage"}]},"intvolume":"        11","citation":{"short":"R. Guseinov, C. McMahan, J. Perez Rodriguez, C. Daraio, B. Bickel, Nature Communications 11 (2020).","chicago":"Guseinov, Ruslan, Connor McMahan, Jesus Perez Rodriguez, Chiara Daraio, and Bernd Bickel. “Programming Temporal Morphing of Self-Actuated Shells.” <i>Nature Communications</i>. Springer Nature, 2020. <a href=\"https://doi.org/10.1038/s41467-019-14015-2\">https://doi.org/10.1038/s41467-019-14015-2</a>.","ieee":"R. Guseinov, C. McMahan, J. Perez Rodriguez, C. Daraio, and B. Bickel, “Programming temporal morphing of self-actuated shells,” <i>Nature Communications</i>, vol. 11. Springer Nature, 2020.","apa":"Guseinov, R., McMahan, C., Perez Rodriguez, J., Daraio, C., &#38; Bickel, B. (2020). Programming temporal morphing of self-actuated shells. <i>Nature Communications</i>. Springer Nature. <a href=\"https://doi.org/10.1038/s41467-019-14015-2\">https://doi.org/10.1038/s41467-019-14015-2</a>","ista":"Guseinov R, McMahan C, Perez Rodriguez J, Daraio C, Bickel B. 2020. Programming temporal morphing of self-actuated shells. Nature Communications. 11, 237.","mla":"Guseinov, Ruslan, et al. “Programming Temporal Morphing of Self-Actuated Shells.” <i>Nature Communications</i>, vol. 11, 237, Springer Nature, 2020, doi:<a href=\"https://doi.org/10.1038/s41467-019-14015-2\">10.1038/s41467-019-14015-2</a>.","ama":"Guseinov R, McMahan C, Perez Rodriguez J, Daraio C, Bickel B. Programming temporal morphing of self-actuated shells. <i>Nature Communications</i>. 2020;11. doi:<a href=\"https://doi.org/10.1038/s41467-019-14015-2\">10.1038/s41467-019-14015-2</a>"},"status":"public","external_id":{"isi":["000511916800015"]},"volume":11,"date_created":"2020-01-13T16:54:26Z","file_date_updated":"2020-07-14T12:47:55Z","date_updated":"2024-02-21T12:45:02Z","abstract":[{"lang":"eng","text":"Advances in shape-morphing materials, such as hydrogels, shape-memory polymers and light-responsive polymers have enabled prescribing self-directed deformations of initially flat geometries. However, most proposed solutions evolve towards a target geometry without considering time-dependent actuation paths. To achieve more complex geometries and avoid self-collisions, it is critical to encode a spatial and temporal shape evolution within the initially flat shell. Recent realizations of time-dependent morphing are limited to the actuation of few, discrete hinges and cannot form doubly curved surfaces. Here, we demonstrate a method for encoding temporal shape evolution in architected shells that assume complex shapes and doubly curved geometries. The shells are non-periodic tessellations of pre-stressed contractile unit cells that soften in water at rates prescribed locally by mesostructure geometry. The ensuing midplane contraction is coupled to the formation of encoded curvatures. We propose an inverse design tool based on a data-driven model for unit cells’ temporal responses."}],"oa_version":"Published Version","type":"journal_article","month":"01","_id":"7262","year":"2020","doi":"10.1038/s41467-019-14015-2","quality_controlled":"1","publication_identifier":{"issn":["2041-1723"]},"isi":1,"keyword":["Design","Synthesis and processing","Mechanical engineering","Polymers"],"language":[{"iso":"eng"}],"project":[{"name":"ISTplus - Postdoctoral Fellowships","_id":"260C2330-B435-11E9-9278-68D0E5697425","call_identifier":"H2020","grant_number":"754411"},{"name":"MATERIALIZABLE: Intelligent fabrication-oriented Computational Design and Modeling","_id":"24F9549A-B435-11E9-9278-68D0E5697425","call_identifier":"H2020","grant_number":"715767"}],"title":"Programming temporal morphing of self-actuated shells","article_number":"237","author":[{"first_name":"Ruslan","last_name":"Guseinov","full_name":"Guseinov, Ruslan","id":"3AB45EE2-F248-11E8-B48F-1D18A9856A87","orcid":"0000-0001-9819-5077"},{"last_name":"McMahan","first_name":"Connor","full_name":"McMahan, Connor"},{"last_name":"Perez Rodriguez","first_name":"Jesus","full_name":"Perez Rodriguez, Jesus","id":"2DC83906-F248-11E8-B48F-1D18A9856A87"},{"full_name":"Daraio, Chiara","first_name":"Chiara","last_name":"Daraio"},{"full_name":"Bickel, Bernd","orcid":"0000-0001-6511-9385","id":"49876194-F248-11E8-B48F-1D18A9856A87","first_name":"Bernd","last_name":"Bickel"}],"day":"13","file":[{"date_created":"2020-01-15T14:35:34Z","access_level":"open_access","date_updated":"2020-07-14T12:47:55Z","file_id":"7336","checksum":"7db23fef2f4cda712f17f1004116ddff","relation":"main_file","content_type":"application/pdf","file_size":1315270,"creator":"rguseino","file_name":"2020_NatureComm_Guseinov.pdf"}],"publication":"Nature Communications","scopus_import":"1","ec_funded":1,"article_processing_charge":"No","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)"},"user_id":"4359f0d1-fa6c-11eb-b949-802e58b17ae8","publisher":"Springer Nature","department":[{"_id":"BeBi"}]},{"quality_controlled":"1","doi":"10.1145/3232860","publication_identifier":{"eissn":["2167-8383"],"issn":["2167-8375"]},"issue":"2","language":[{"iso":"eng"}],"keyword":["Theory of computation","Algorithmic game theory and mechanism design","Applied computing","Economics","Simplified mechanisms","Combinatorial auctions with item bidding","Price of anarchy"],"article_number":"5","title":"Valuation compressions in VCG-based combinatorial auctions","arxiv":1,"day":"01","author":[{"full_name":"Dütting, Paul","first_name":"Paul","last_name":"Dütting"},{"first_name":"Monika H","last_name":"Henzinger","orcid":"0000-0002-5008-6530","id":"540c9bbd-f2de-11ec-812d-d04a5be85630","full_name":"Henzinger, Monika H"},{"full_name":"Starnberger, Martin","first_name":"Martin","last_name":"Starnberger"}],"article_type":"original","article_processing_charge":"No","scopus_import":"1","publication":"ACM Transactions on Economics and Computation","user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","publisher":"Association for Computing Machinery","main_file_link":[{"url":"https://arxiv.org/abs/1310.3153","open_access":"1"}],"date_published":"2018-05-01T00:00:00Z","oa":1,"publication_status":"published","citation":{"chicago":"Dütting, Paul, Monika H Henzinger, and Martin Starnberger. “Valuation Compressions in VCG-Based Combinatorial Auctions.” <i>ACM Transactions on Economics and Computation</i>. Association for Computing Machinery, 2018. <a href=\"https://doi.org/10.1145/3232860\">https://doi.org/10.1145/3232860</a>.","ieee":"P. Dütting, M. H. Henzinger, and M. Starnberger, “Valuation compressions in VCG-based combinatorial auctions,” <i>ACM Transactions on Economics and Computation</i>, vol. 6, no. 2. Association for Computing Machinery, 2018.","short":"P. Dütting, M.H. Henzinger, M. Starnberger, ACM Transactions on Economics and Computation 6 (2018).","ama":"Dütting P, Henzinger MH, Starnberger M. Valuation compressions in VCG-based combinatorial auctions. <i>ACM Transactions on Economics and Computation</i>. 2018;6(2). doi:<a href=\"https://doi.org/10.1145/3232860\">10.1145/3232860</a>","apa":"Dütting, P., Henzinger, M. H., &#38; Starnberger, M. (2018). Valuation compressions in VCG-based combinatorial auctions. <i>ACM Transactions on Economics and Computation</i>. Association for Computing Machinery. <a href=\"https://doi.org/10.1145/3232860\">https://doi.org/10.1145/3232860</a>","mla":"Dütting, Paul, et al. “Valuation Compressions in VCG-Based Combinatorial Auctions.” <i>ACM Transactions on Economics and Computation</i>, vol. 6, no. 2, 5, Association for Computing Machinery, 2018, doi:<a href=\"https://doi.org/10.1145/3232860\">10.1145/3232860</a>.","ista":"Dütting P, Henzinger MH, Starnberger M. 2018. Valuation compressions in VCG-based combinatorial auctions. ACM Transactions on Economics and Computation. 6(2), 5."},"extern":"1","intvolume":"         6","external_id":{"arxiv":["1310.3153"]},"status":"public","date_created":"2022-07-27T11:46:46Z","volume":6,"type":"journal_article","oa_version":"Preprint","month":"05","abstract":[{"text":"The focus of classic mechanism design has been on truthful direct-revelation mechanisms. In the context of combinatorial auctions, the truthful direct-revelation mechanism that maximizes social welfare is the Vickrey-Clarke-Groves mechanism. For many valuation spaces, computing the allocation and payments of the VCG mechanism, however, is a computationally hard problem. We thus study the performance of the VCG mechanism when bidders are forced to choose bids from a subspace of the valuation space for which the VCG outcome can be computed efficiently. We prove improved upper bounds on the welfare loss for restrictions to additive bids and upper and lower bounds for restrictions to non-additive bids. These bounds show that increased expressiveness can give rise to additional equilibria of poorer efficiency.","lang":"eng"}],"date_updated":"2022-09-09T12:04:42Z","_id":"11667","year":"2018"}]