[{"page":"7568-7588","month":"03","type":"journal_article","oa_version":"Published Version","date_updated":"2023-08-07T14:11:57Z","abstract":[{"lang":"eng","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."}],"volume":29,"date_created":"2021-03-14T23:01:33Z","file_date_updated":"2021-03-22T08:15:28Z","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","_id":"9241","publication_status":"published","oa":1,"has_accepted_license":"1","date_published":"2021-03-01T00:00:00Z","ddc":["000"],"status":"public","external_id":{"isi":["000624968100103"]},"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>."},"author":[{"first_name":"Oskar","last_name":"Elek","full_name":"Elek, Oskar"},{"id":"4DDBCEB0-F248-11E8-B48F-1D18A9856A87","orcid":"0000-0002-3808-281X","full_name":"Zhang, Ran","first_name":"Ran","last_name":"Zhang"},{"full_name":"Sumin, Denis","first_name":"Denis","last_name":"Sumin"},{"last_name":"Myszkowski","first_name":"Karol","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"},{"full_name":"Wilkie, Alexander","first_name":"Alexander","last_name":"Wilkie"},{"last_name":"Křivánek","first_name":"Jaroslav","full_name":"Křivánek, Jaroslav"},{"last_name":"Weyrich","first_name":"Tim","full_name":"Weyrich, Tim"}],"file":[{"date_created":"2021-03-22T08:15:28Z","access_level":"open_access","file_id":"9269","date_updated":"2021-03-22T08:15:28Z","checksum":"a9697ad83136c19ad87e46aa2db63cfd","file_size":10873700,"relation":"main_file","content_type":"application/pdf","creator":"dernst","file_name":"2021_OpticsExpress_Elek.pdf","success":1}],"day":"01","title":"Robust and practical measurement of volume transport parameters in solid photo-polymer materials for 3D printing","user_id":"4359f0d1-fa6c-11eb-b949-802e58b17ae8","publisher":"The Optical Society","department":[{"_id":"BeBi"}],"publication":"Optics Express","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","ec_funded":1,"article_processing_charge":"No","scopus_import":"1","publication_identifier":{"eissn":["1094-4087"]},"doi":"10.1364/OE.406095","quality_controlled":"1","project":[{"grant_number":"642841","name":"Distributed 3D Object Design","call_identifier":"H2020","_id":"2508E324-B435-11E9-9278-68D0E5697425"},{"name":"MATERIALIZABLE: Intelligent fabrication-oriented Computational Design and Modeling","call_identifier":"H2020","_id":"24F9549A-B435-11E9-9278-68D0E5697425","grant_number":"715767"}],"isi":1,"issue":"5","language":[{"iso":"eng"}]},{"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","call_identifier":"H2020","_id":"24F9549A-B435-11E9-9278-68D0E5697425"}],"language":[{"iso":"eng"}],"issue":"5","isi":1,"keyword":["multistability","mechanism","computational design","rigidity"],"publication_identifier":{"issn":["0730-0301"],"eissn":["1557-7368"]},"quality_controlled":"1","doi":"10.1145/3453477","department":[{"_id":"BeBi"}],"publisher":"Association for Computing Machinery","user_id":"4359f0d1-fa6c-11eb-b949-802e58b17ae8","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","publication":"ACM Transactions on Graphics","day":"08","file":[{"file_name":"Multistable-authorversion.pdf","file_size":18926557,"relation":"main_file","content_type":"application/pdf","creator":"bbickel","file_id":"9377","date_updated":"2021-05-08T17:36:59Z","checksum":"8564b3118457d4c8939a8ef2b1a2f16c","date_created":"2021-05-08T17:36:59Z","access_level":"open_access"},{"file_id":"9378","date_updated":"2021-05-08T17:38:22Z","checksum":"3b6e874e30bfa1bfc3ad3498710145a1","date_created":"2021-05-08T17:38:22Z","access_level":"open_access","file_name":"multistable-video.mp4","success":1,"file_size":76542901,"relation":"main_file","content_type":"video/mp4","creator":"bbickel"},{"date_created":"2021-12-17T08:13:51Z","title":"Supplementary Material for “Computational Design of Planar Multistable Compliant Structures”","access_level":"open_access","file_id":"10562","date_updated":"2021-12-17T08:13:51Z","checksum":"20dc3bc42e1a912a5b0247c116772098","description":"This document provides additional results and analyzes the robustness and limitations of our approach.","file_size":3367072,"relation":"supplementary_material","content_type":"application/pdf","creator":"bbickel","file_name":"multistable-supplementary material.pdf"}],"author":[{"first_name":"Ran","last_name":"Zhang","full_name":"Zhang, Ran","id":"4DDBCEB0-F248-11E8-B48F-1D18A9856A87","orcid":"0000-0002-3808-281X"},{"first_name":"Thomas","last_name":"Auzinger","id":"4718F954-F248-11E8-B48F-1D18A9856A87","orcid":"0000-0002-1546-3265","full_name":"Auzinger, Thomas"},{"id":"49876194-F248-11E8-B48F-1D18A9856A87","orcid":"0000-0001-6511-9385","full_name":"Bickel, Bernd","first_name":"Bernd","last_name":"Bickel"}],"title":"Computational design of planar multistable compliant structures","article_number":"186","external_id":{"isi":["000752079300003"]},"status":"public","citation":{"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>","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>.","ista":"Zhang R, Auzinger T, Bickel B. 2021. Computational design of planar multistable compliant structures. ACM Transactions on Graphics. 40(5), 186.","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)."},"intvolume":"        40","has_accepted_license":"1","oa":1,"publication_status":"published","acknowledged_ssus":[{"_id":"M-Shop"}],"ddc":["000"],"date_published":"2021-10-08T00:00:00Z","year":"2021","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).","_id":"9376","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."}],"date_updated":"2023-08-08T13:31:38Z","type":"journal_article","month":"10","oa_version":"Published Version","date_created":"2021-05-08T17:37:08Z","file_date_updated":"2021-12-17T08:13:51Z","volume":40},{"project":[{"_id":"2508E324-B435-11E9-9278-68D0E5697425","call_identifier":"H2020","name":"Distributed 3D Object Design","grant_number":"642841"},{"grant_number":"715767","name":"MATERIALIZABLE: Intelligent fabrication-oriented Computational Design and Modeling","call_identifier":"H2020","_id":"24F9549A-B435-11E9-9278-68D0E5697425"}],"language":[{"iso":"eng"}],"issue":"2","isi":1,"publication_identifier":{"eissn":["1467-8659"],"issn":["0167-7055"]},"quality_controlled":"1","doi":"10.1111/cgf.142626","department":[{"_id":"BeBi"}],"publisher":"Wiley","user_id":"4359f0d1-fa6c-11eb-b949-802e58b17ae8","scopus_import":"1","ec_funded":1,"article_processing_charge":"No","article_type":"original","publication":"Computer Graphics Forum","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","author":[{"last_name":"Rittig","first_name":"Tobias","full_name":"Rittig, Tobias"},{"full_name":"Sumin, Denis","first_name":"Denis","last_name":"Sumin"},{"full_name":"Babaei, Vahid","first_name":"Vahid","last_name":"Babaei"},{"full_name":"Didyk, Piotr","first_name":"Piotr","last_name":"Didyk"},{"first_name":"Alexey","last_name":"Voloboy","full_name":"Voloboy, Alexey"},{"first_name":"Alexander","last_name":"Wilkie","full_name":"Wilkie, Alexander"},{"first_name":"Bernd","last_name":"Bickel","full_name":"Bickel, Bernd","orcid":"0000-0001-6511-9385","id":"49876194-F248-11E8-B48F-1D18A9856A87"},{"full_name":"Myszkowski, Karol","first_name":"Karol","last_name":"Myszkowski"},{"full_name":"Weyrich, Tim","last_name":"Weyrich","first_name":"Tim"},{"last_name":"Křivánek","first_name":"Jaroslav","full_name":"Křivánek, Jaroslav"}],"title":"Neural acceleration of scattering-aware color 3D printing","external_id":{"isi":["000657959600017"]},"status":"public","citation":{"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>.","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>"},"intvolume":"        40","has_accepted_license":"1","publication_status":"published","oa":1,"date_published":"2021-05-01T00:00:00Z","ddc":["004"],"year":"2021","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).","_id":"9547","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."}],"oa_version":"Submitted Version","type":"journal_article","month":"05","page":"205-219","date_created":"2021-06-13T22:01:32Z","file_date_updated":"2021-10-11T12:06:50Z","volume":40},{"quality_controlled":"1","doi":"10.1145/3472749.3474798","publication_identifier":{"isbn":["978-1-4503-8635-7"]},"language":[{"iso":"eng"}],"conference":{"name":"UIST: User Interface Software and Technology","location":"Virtual","start_date":"2021-10-10","end_date":"2021-10-14"},"project":[{"grant_number":"642841","call_identifier":"H2020","_id":"2508E324-B435-11E9-9278-68D0E5697425","name":"Distributed 3D Object Design"}],"title":"Capturing tactile properties of real surfaces for haptic reproduction","file":[{"date_created":"2021-10-18T07:36:03Z","access_level":"open_access","date_updated":"2021-10-18T07:36:03Z","file_id":"10149","checksum":"b0b26464df79b3a59e8ed82e4e19ab15","content_type":"application/pdf","relation":"main_file","file_size":29796364,"creator":"bbickel","file_name":"degraen-UIST2021_Texture_Appropriation_CR_preprint.pdf"}],"day":"10","author":[{"last_name":"Degraen","first_name":"Donald","full_name":"Degraen, Donald"},{"id":"62E473F4-5C99-11EA-A40E-AF823DDC885E","full_name":"Piovarci, Michael","first_name":"Michael","last_name":"Piovarci"},{"last_name":"Bickel","first_name":"Bernd","full_name":"Bickel, Bernd","orcid":"0000-0001-6511-9385","id":"49876194-F248-11E8-B48F-1D18A9856A87"},{"last_name":"Kruger","first_name":"Antonio","full_name":"Kruger, Antonio"}],"ec_funded":1,"article_processing_charge":"No","publication":"34th Annual ACM Symposium","department":[{"_id":"BeBi"}],"user_id":"8b945eb4-e2f2-11eb-945a-df72226e66a9","publisher":"Association for Computing Machinery","date_published":"2021-10-10T00:00:00Z","ddc":["000"],"has_accepted_license":"1","oa":1,"publication_status":"published","citation":{"short":"D. Degraen, M. Piovarci, B. Bickel, A. Kruger, in:, 34th Annual ACM Symposium, Association for Computing Machinery, 2021, pp. 954–971.","ieee":"D. Degraen, M. Piovarci, B. Bickel, and A. Kruger, “Capturing tactile properties of real surfaces for haptic reproduction,” in <i>34th Annual ACM Symposium</i>, Virtual, 2021, pp. 954–971.","chicago":"Degraen, Donald, Michael Piovarci, Bernd Bickel, and Antonio Kruger. “Capturing Tactile Properties of Real Surfaces for Haptic Reproduction.” In <i>34th Annual ACM Symposium</i>, 954–71. Association for Computing Machinery, 2021. <a href=\"https://doi.org/10.1145/3472749.3474798\">https://doi.org/10.1145/3472749.3474798</a>.","ista":"Degraen D, Piovarci M, Bickel B, Kruger A. 2021. Capturing tactile properties of real surfaces for haptic reproduction. 34th Annual ACM Symposium. UIST: User Interface Software and Technology, 954–971.","mla":"Degraen, Donald, et al. “Capturing Tactile Properties of Real Surfaces for Haptic Reproduction.” <i>34th Annual ACM Symposium</i>, Association for Computing Machinery, 2021, pp. 954–71, doi:<a href=\"https://doi.org/10.1145/3472749.3474798\">10.1145/3472749.3474798</a>.","apa":"Degraen, D., Piovarci, M., Bickel, B., &#38; Kruger, A. (2021). Capturing tactile properties of real surfaces for haptic reproduction. In <i>34th Annual ACM Symposium</i> (pp. 954–971). Virtual: Association for Computing Machinery. <a href=\"https://doi.org/10.1145/3472749.3474798\">https://doi.org/10.1145/3472749.3474798</a>","ama":"Degraen D, Piovarci M, Bickel B, Kruger A. Capturing tactile properties of real surfaces for haptic reproduction. In: <i>34th Annual ACM Symposium</i>. Association for Computing Machinery; 2021:954-971. doi:<a href=\"https://doi.org/10.1145/3472749.3474798\">10.1145/3472749.3474798</a>"},"status":"public","date_created":"2021-10-18T07:36:11Z","file_date_updated":"2021-10-18T07:36:03Z","month":"10","type":"conference","oa_version":"Preprint","date_updated":"2021-10-19T19:29:06Z","abstract":[{"lang":"eng","text":"Tactile feedback of an object’s surface enables us to discern its material properties and affordances. This understanding is used in digital fabrication processes by creating objects with high-resolution surface variations to influence a user’s tactile perception. As the design of such surface haptics commonly relies on knowledge from real-life experiences, it is unclear how to adapt this information for digital design methods. In this work, we investigate replicating the haptics of real materials. Using an existing process for capturing an object’s microgeometry, we digitize and reproduce the stable surface information of a set of 15 fabric samples. In a psychophysical experiment, we evaluate the tactile qualities of our set of original samples and their replicas. From our results, we see that direct reproduction of surface variations is able to influence different psychophysical dimensions of the tactile perception of surface textures. While the fabrication process did not preserve all properties, our approach underlines that replication of surface microgeometries benefits fabrication methods in terms of haptic perception by covering a large range of tactile variations. Moreover, by changing the surface structure of a single fabricated material, its material perception can be influenced. We conclude by proposing strategies for capturing and reproducing digitized textures to better resemble the perceived haptics of the originals."}],"page":"954-971","_id":"10148","year":"2021","acknowledgement":"Our gratitude goes out to Kamila Mushkina, Akhmajon Makhsadov, Jordan Espenshade, Bruno Fruchard, Roland Bennewitz, and Robert Drumm. This project has received funding from the EU’s Horizon 2020 research and innovation programme, under the Marie Skłodowska-Curie grant agreement No 642841 (DISTRO)."},{"language":[{"iso":"eng"}],"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","call_identifier":"H2020","_id":"24F9549A-B435-11E9-9278-68D0E5697425"}],"doi":"10.15479/AT:ISTA:8386","publication_identifier":{"issn":["2663-337X"]},"article_processing_charge":"No","ec_funded":1,"department":[{"_id":"BeBi"}],"user_id":"c635000d-4b10-11ee-a964-aac5a93f6ac1","publisher":"Institute of Science and Technology Austria","degree_awarded":"PhD","title":"Structure-aware computational design and its application to 3D printable volume scattering, mechanism, and multistability","day":"14","file":[{"date_updated":"2020-09-14T12:18:43Z","file_id":"8388","checksum":"edcf578b6e1c9b0dd81ff72d319b66ba","date_created":"2020-09-14T01:02:59Z","access_level":"closed","file_name":"Thesis_Ran.zip","relation":"source_file","content_type":"application/x-zip-compressed","file_size":1245800191,"creator":"rzhang"},{"file_size":161385316,"content_type":"application/pdf","relation":"main_file","creator":"rzhang","file_name":"PhD_thesis_Ran Zhang_20200915.pdf","success":1,"date_created":"2020-09-15T12:51:53Z","access_level":"open_access","file_id":"8396","date_updated":"2020-09-15T12:51:53Z","checksum":"817e20c33be9247f906925517c56a40d"}],"author":[{"orcid":"0000-0002-3808-281X","id":"4DDBCEB0-F248-11E8-B48F-1D18A9856A87","full_name":"Zhang, Ran","last_name":"Zhang","first_name":"Ran"}],"citation":{"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>","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.","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>","short":"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>.","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."},"related_material":{"record":[{"id":"486","status":"public","relation":"part_of_dissertation"},{"relation":"part_of_dissertation","id":"1002","status":"public"}]},"status":"public","alternative_title":["ISTA Thesis"],"acknowledged_ssus":[{"_id":"SSU"}],"supervisor":[{"last_name":"Bickel","first_name":"Bernd","orcid":"0000-0001-6511-9385","id":"49876194-F248-11E8-B48F-1D18A9856A87","full_name":"Bickel, Bernd"}],"date_published":"2020-09-14T00:00:00Z","ddc":["003"],"has_accepted_license":"1","publication_status":"published","oa":1,"_id":"8386","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.","date_created":"2020-09-14T01:04:53Z","file_date_updated":"2020-09-15T12:51:53Z","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"}],"date_updated":"2023-09-22T09:49:31Z","month":"09","type":"dissertation","oa_version":"Published Version","page":"148"},{"external_id":{"isi":["000475740600085"]},"status":"public","intvolume":"        38","citation":{"short":"D. Sumin, T. Weyrich, T. Rittig, V. Babaei, T. Nindel, A. Wilkie, P. Didyk, B. Bickel, J. Křivánek, K. Myszkowski, ACM Transactions on Graphics 38 (2019).","chicago":"Sumin, Denis, Tim Weyrich, Tobias Rittig, Vahid Babaei, Thomas Nindel, Alexander Wilkie, Piotr Didyk, Bernd Bickel, Jaroslav Křivánek, and Karol Myszkowski. “Geometry-Aware Scattering Compensation for 3D Printing.” <i>ACM Transactions on Graphics</i>. ACM, 2019. <a href=\"https://doi.org/10.1145/3306346.3322992\">https://doi.org/10.1145/3306346.3322992</a>.","ieee":"D. Sumin <i>et al.</i>, “Geometry-aware scattering compensation for 3D printing,” <i>ACM Transactions on Graphics</i>, vol. 38, no. 4. ACM, 2019.","apa":"Sumin, D., Weyrich, T., Rittig, T., Babaei, V., Nindel, T., Wilkie, A., … Myszkowski, K. (2019). Geometry-aware scattering compensation for 3D printing. <i>ACM Transactions on Graphics</i>. ACM. <a href=\"https://doi.org/10.1145/3306346.3322992\">https://doi.org/10.1145/3306346.3322992</a>","mla":"Sumin, Denis, et al. “Geometry-Aware Scattering Compensation for 3D Printing.” <i>ACM Transactions on Graphics</i>, vol. 38, no. 4, 111, ACM, 2019, doi:<a href=\"https://doi.org/10.1145/3306346.3322992\">10.1145/3306346.3322992</a>.","ista":"Sumin D, Weyrich T, Rittig T, Babaei V, Nindel T, Wilkie A, Didyk P, Bickel B, Křivánek J, Myszkowski K. 2019. Geometry-aware scattering compensation for 3D printing. ACM Transactions on Graphics. 38(4), 111.","ama":"Sumin D, Weyrich T, Rittig T, et al. Geometry-aware scattering compensation for 3D printing. <i>ACM Transactions on Graphics</i>. 2019;38(4). doi:<a href=\"https://doi.org/10.1145/3306346.3322992\">10.1145/3306346.3322992</a>"},"publication_status":"published","oa":1,"has_accepted_license":"1","date_published":"2019-07-04T00:00:00Z","ddc":["000"],"year":"2019","_id":"6660","oa_version":"Submitted Version","month":"07","type":"journal_article","abstract":[{"lang":"eng","text":"Commercially available full-color 3D printing allows for detailed control of material deposition in a volume, but an exact reproduction of a target surface appearance is hampered by the strong subsurface scattering that causes nontrivial volumetric cross-talk at the print surface. Previous work showed how an iterative optimization scheme based on accumulating absorptive materials at the surface can be used to find a volumetric distribution of print materials that closely approximates a given target appearance.\r\n\r\nIn this work, we first revisit the assumption that pushing the absorptive materials to the surface results in minimal volumetric cross-talk. We design a full-fledged optimization on a small domain for this task and confirm this previously reported heuristic. Then, we extend the above approach that is critically limited to color reproduction on planar surfaces, to arbitrary 3D shapes. Our method enables high-fidelity color texture reproduction on 3D prints by effectively compensating for internal light scattering within arbitrarily shaped objects. In addition, we propose a content-aware gamut mapping that significantly improves color reproduction for the pathological case of thin geometric features. Using a wide range of sample objects with complex textures and geometries, we demonstrate color reproduction whose fidelity is superior to state-of-the-art drivers for color 3D printers."}],"date_updated":"2023-08-29T06:40:49Z","volume":38,"file_date_updated":"2020-07-14T12:47:36Z","date_created":"2019-07-22T07:22:28Z","project":[{"grant_number":"642841","call_identifier":"H2020","_id":"2508E324-B435-11E9-9278-68D0E5697425","name":"Distributed 3D Object Design"},{"grant_number":"715767","call_identifier":"H2020","_id":"24F9549A-B435-11E9-9278-68D0E5697425","name":"MATERIALIZABLE: Intelligent fabrication-oriented Computational Design and Modeling"}],"isi":1,"issue":"4","language":[{"iso":"eng"}],"publication_identifier":{"issn":["0730-0301"]},"doi":"10.1145/3306346.3322992","quality_controlled":"1","user_id":"4359f0d1-fa6c-11eb-b949-802e58b17ae8","publisher":"ACM","department":[{"_id":"BeBi"}],"publication":"ACM Transactions on Graphics","ec_funded":1,"article_processing_charge":"No","scopus_import":"1","author":[{"full_name":"Sumin, Denis","first_name":"Denis","last_name":"Sumin"},{"last_name":"Weyrich","first_name":"Tim","full_name":"Weyrich, Tim"},{"full_name":"Rittig, Tobias","first_name":"Tobias","last_name":"Rittig"},{"first_name":"Vahid","last_name":"Babaei","full_name":"Babaei, Vahid"},{"first_name":"Thomas","last_name":"Nindel","full_name":"Nindel, Thomas"},{"first_name":"Alexander","last_name":"Wilkie","full_name":"Wilkie, Alexander"},{"full_name":"Didyk, Piotr","last_name":"Didyk","first_name":"Piotr"},{"full_name":"Bickel, Bernd","id":"49876194-F248-11E8-B48F-1D18A9856A87","orcid":"0000-0001-6511-9385","last_name":"Bickel","first_name":"Bernd"},{"last_name":"Křivánek","first_name":"Jaroslav","full_name":"Křivánek, Jaroslav"},{"last_name":"Myszkowski","first_name":"Karol","full_name":"Myszkowski, Karol"}],"file":[{"date_updated":"2020-07-14T12:47:36Z","file_id":"6669","checksum":"43c2019d6b48ed9c56e31686c4c2d1f5","date_created":"2019-07-24T07:36:08Z","access_level":"open_access","file_name":"2019_ACM_Sumin_AuthorVersion.pdf","relation":"main_file","content_type":"application/pdf","file_size":10109800,"creator":"dernst"},{"file_name":"sumin19geometry-aware-suppl.zip","file_size":11051245,"relation":"supplementary_material","content_type":"application/zip","creator":"dernst","file_id":"6938","date_updated":"2020-07-14T12:47:36Z","checksum":"f80f365a04e35855fa467ea7ab26b16c","date_created":"2019-10-11T06:51:07Z","access_level":"open_access"}],"day":"04","article_number":"111","title":"Geometry-aware scattering compensation for 3D printing"},{"project":[{"_id":"2508E324-B435-11E9-9278-68D0E5697425","call_identifier":"H2020","name":"Distributed 3D Object Design","grant_number":"642841"}],"language":[{"iso":"eng"}],"issue":"4","isi":1,"publication_identifier":{"issn":["0730-0301"]},"quality_controlled":"1","doi":"10.1145/3306346.3323009","department":[{"_id":"ChWo"}],"publisher":"ACM","user_id":"4359f0d1-fa6c-11eb-b949-802e58b17ae8","ec_funded":1,"article_processing_charge":"No","scopus_import":"1","article_type":"original","publication":"ACM Transactions on Graphics","day":"01","author":[{"full_name":"Kondapaneni, Ivo","last_name":"Kondapaneni","first_name":"Ivo"},{"full_name":"Vevoda, Petr","first_name":"Petr","last_name":"Vevoda"},{"full_name":"Grittmann, Pascal","last_name":"Grittmann","first_name":"Pascal"},{"first_name":"Tomas","last_name":"Skrivan","id":"486A5A46-F248-11E8-B48F-1D18A9856A87","full_name":"Skrivan, Tomas"},{"last_name":"Slusallek","first_name":"Philipp","full_name":"Slusallek, Philipp"},{"full_name":"Křivánek, Jaroslav","last_name":"Křivánek","first_name":"Jaroslav"}],"title":"Optimal multiple importance sampling","article_number":"37","status":"public","external_id":{"isi":["000475740600011"]},"citation":{"ama":"Kondapaneni I, Vevoda P, Grittmann P, Skrivan T, Slusallek P, Křivánek J. Optimal multiple importance sampling. <i>ACM Transactions on Graphics</i>. 2019;38(4). doi:<a href=\"https://doi.org/10.1145/3306346.3323009\">10.1145/3306346.3323009</a>","ista":"Kondapaneni I, Vevoda P, Grittmann P, Skrivan T, Slusallek P, Křivánek J. 2019. Optimal multiple importance sampling. ACM Transactions on Graphics. 38(4), 37.","mla":"Kondapaneni, Ivo, et al. “Optimal Multiple Importance Sampling.” <i>ACM Transactions on Graphics</i>, vol. 38, no. 4, 37, ACM, 2019, doi:<a href=\"https://doi.org/10.1145/3306346.3323009\">10.1145/3306346.3323009</a>.","apa":"Kondapaneni, I., Vevoda, P., Grittmann, P., Skrivan, T., Slusallek, P., &#38; Křivánek, J. (2019). Optimal multiple importance sampling. <i>ACM Transactions on Graphics</i>. ACM. <a href=\"https://doi.org/10.1145/3306346.3323009\">https://doi.org/10.1145/3306346.3323009</a>","ieee":"I. Kondapaneni, P. Vevoda, P. Grittmann, T. Skrivan, P. Slusallek, and J. Křivánek, “Optimal multiple importance sampling,” <i>ACM Transactions on Graphics</i>, vol. 38, no. 4. ACM, 2019.","chicago":"Kondapaneni, Ivo, Petr Vevoda, Pascal Grittmann, Tomas Skrivan, Philipp Slusallek, and Jaroslav Křivánek. “Optimal Multiple Importance Sampling.” <i>ACM Transactions on Graphics</i>. ACM, 2019. <a href=\"https://doi.org/10.1145/3306346.3323009\">https://doi.org/10.1145/3306346.3323009</a>.","short":"I. Kondapaneni, P. Vevoda, P. Grittmann, T. Skrivan, P. Slusallek, J. Křivánek, ACM Transactions on Graphics 38 (2019)."},"intvolume":"        38","publication_status":"published","date_published":"2019-07-01T00:00:00Z","year":"2019","_id":"7002","abstract":[{"text":"Multiple Importance Sampling (MIS) is a key technique for achieving robustness of Monte Carlo estimators in computer graphics and other fields. We derive optimal weighting functions for MIS that provably minimize the variance of an MIS estimator, given a set of sampling techniques. We show that the resulting variance reduction over the balance heuristic can be higher than predicted by the variance bounds derived by Veach and Guibas, who assumed only non-negative weights in their proof. We theoretically analyze the variance of the optimal MIS weights and show the relation to the variance of the balance heuristic. Furthermore, we establish a connection between the new weighting functions and control variates as previously applied to mixture sampling. We apply the new optimal weights to integration problems in light transport and show that they allow for new design considerations when choosing the appropriate sampling techniques for a given integration problem.","lang":"eng"}],"date_updated":"2023-08-30T07:21:25Z","type":"journal_article","oa_version":"None","month":"07","date_created":"2019-11-12T13:05:40Z","volume":38},{"abstract":[{"text":"Molding is a popular mass production method, in which the initial expenses for the mold are offset by the low per-unit production cost. However, the physical fabrication constraints of the molding technique commonly restrict the shape of moldable objects. For a complex shape, a decomposition of the object into moldable parts is a common strategy to address these constraints, with plastic model kits being a popular and illustrative example. However, conducting such a decomposition requires considerable expertise, and it depends on the technical aspects of the fabrication technique, as well as aesthetic considerations. We present an interactive technique to create such decompositions for two-piece molding, in which each part of the object is cast between two rigid mold pieces. Given the surface description of an object, we decompose its thin-shell equivalent into moldable parts by first performing a coarse decomposition and then utilizing an active contour model for the boundaries between individual parts. Formulated as an optimization problem, the movement of the contours is guided by an energy reflecting fabrication constraints to ensure the moldability of each part. Simultaneously, the user is provided with editing capabilities to enforce aesthetic guidelines. Our interactive interface provides control of the contour positions by allowing, for example, the alignment of part boundaries with object features. Our technique enables a novel workflow, as it empowers novice users to explore the design space, and it generates fabrication-ready two-piece molds that can be used either for casting or industrial injection molding of free-form objects.","lang":"eng"}],"date_updated":"2023-09-11T12:48:09Z","month":"08","type":"journal_article","oa_version":"Submitted Version","date_created":"2018-12-11T11:44:09Z","file_date_updated":"2020-07-14T12:44:38Z","volume":37,"year":"2018","_id":"12","has_accepted_license":"1","publication_status":"published","oa":1,"ddc":["004","516","670"],"date_published":"2018-08-04T00:00:00Z","status":"public","external_id":{"isi":["000448185000096"]},"citation":{"short":"K. Nakashima, T. Auzinger, E. Iarussi, R. Zhang, T. Igarashi, B. Bickel, ACM Transaction on Graphics 37 (2018).","ieee":"K. Nakashima, T. Auzinger, E. Iarussi, R. Zhang, T. Igarashi, and B. Bickel, “CoreCavity: Interactive shell decomposition for fabrication with two-piece rigid molds,” <i>ACM Transaction on Graphics</i>, vol. 37, no. 4. ACM, 2018.","chicago":"Nakashima, Kazutaka, Thomas Auzinger, Emmanuel Iarussi, Ran Zhang, Takeo Igarashi, and Bernd Bickel. “CoreCavity: Interactive Shell Decomposition for Fabrication with Two-Piece Rigid Molds.” <i>ACM Transaction on Graphics</i>. ACM, 2018. <a href=\"https://doi.org/10.1145/3197517.3201341\">https://doi.org/10.1145/3197517.3201341</a>.","ista":"Nakashima K, Auzinger T, Iarussi E, Zhang R, Igarashi T, Bickel B. 2018. CoreCavity: Interactive shell decomposition for fabrication with two-piece rigid molds. ACM Transaction on Graphics. 37(4), 135.","mla":"Nakashima, Kazutaka, et al. “CoreCavity: Interactive Shell Decomposition for Fabrication with Two-Piece Rigid Molds.” <i>ACM Transaction on Graphics</i>, vol. 37, no. 4, 135, ACM, 2018, doi:<a href=\"https://doi.org/10.1145/3197517.3201341\">10.1145/3197517.3201341</a>.","apa":"Nakashima, K., Auzinger, T., Iarussi, E., Zhang, R., Igarashi, T., &#38; Bickel, B. (2018). CoreCavity: Interactive shell decomposition for fabrication with two-piece rigid molds. <i>ACM Transaction on Graphics</i>. ACM. <a href=\"https://doi.org/10.1145/3197517.3201341\">https://doi.org/10.1145/3197517.3201341</a>","ama":"Nakashima K, Auzinger T, Iarussi E, Zhang R, Igarashi T, Bickel B. CoreCavity: Interactive shell decomposition for fabrication with two-piece rigid molds. <i>ACM Transaction on Graphics</i>. 2018;37(4). doi:<a href=\"https://doi.org/10.1145/3197517.3201341\">10.1145/3197517.3201341</a>"},"intvolume":"        37","related_material":{"link":[{"relation":"press_release","description":"News on IST Homepage","url":"https://ist.ac.at/en/news/interactive-software-tool-makes-complex-mold-design-simple/"}]},"file":[{"date_created":"2018-12-12T10:18:38Z","access_level":"open_access","file_id":"5360","date_updated":"2020-07-14T12:44:38Z","checksum":"6a5368bc86c4e1a9fcfe588fd1f14ee8","file_size":104225664,"relation":"main_file","content_type":"application/pdf","creator":"system","file_name":"IST-2018-1037-v1+1_CoreCavity-AuthorVersion.pdf"},{"checksum":"3861e693ba47c51f3ec7b7867d573a61","date_updated":"2020-07-14T12:44:38Z","file_id":"5361","access_level":"open_access","date_created":"2018-12-12T10:18:39Z","file_name":"IST-2018-1037-v1+2_CoreCavity-Supplemental.zip","creator":"system","relation":"main_file","content_type":"application/zip","file_size":377743553},{"relation":"main_file","content_type":"video/vnd.objectvideo","file_size":162634396,"creator":"system","file_name":"IST-2018-1037-v1+3_CoreCavity-Video.mp4","date_created":"2018-12-12T10:18:41Z","access_level":"open_access","date_updated":"2020-07-14T12:44:38Z","file_id":"5362","checksum":"490040c685ed869536e2a18f5a906b94"},{"access_level":"open_access","date_created":"2018-12-12T10:18:42Z","checksum":"be7fc8b229adda727419b6504b3b9352","file_id":"5363","date_updated":"2020-07-14T12:44:38Z","creator":"system","file_size":527972,"relation":"main_file","content_type":"image/jpeg","file_name":"IST-2018-1037-v1+4_CoreCavity-RepresentativeImage.jpg"}],"day":"04","author":[{"last_name":"Nakashima","first_name":"Kazutaka","full_name":"Nakashima, Kazutaka"},{"id":"4718F954-F248-11E8-B48F-1D18A9856A87","orcid":"0000-0002-1546-3265","full_name":"Auzinger, Thomas","first_name":"Thomas","last_name":"Auzinger"},{"id":"33F19F16-F248-11E8-B48F-1D18A9856A87","full_name":"Iarussi, Emmanuel","first_name":"Emmanuel","last_name":"Iarussi"},{"full_name":"Zhang, Ran","orcid":"0000-0002-3808-281X","id":"4DDBCEB0-F248-11E8-B48F-1D18A9856A87","first_name":"Ran","last_name":"Zhang"},{"full_name":"Igarashi, Takeo","last_name":"Igarashi","first_name":"Takeo"},{"full_name":"Bickel, Bernd","orcid":"0000-0001-6511-9385","id":"49876194-F248-11E8-B48F-1D18A9856A87","first_name":"Bernd","last_name":"Bickel"}],"publist_id":"8044","title":"CoreCavity: Interactive shell decomposition for fabrication with two-piece rigid molds","article_number":"135","department":[{"_id":"BeBi"}],"user_id":"c635000d-4b10-11ee-a964-aac5a93f6ac1","publisher":"ACM","ec_funded":1,"article_processing_charge":"No","scopus_import":"1","publication":"ACM Transaction on Graphics","pubrep_id":"1037","quality_controlled":"1","doi":"10.1145/3197517.3201341","project":[{"name":"MATERIALIZABLE: Intelligent fabrication-oriented Computational Design and Modeling","call_identifier":"H2020","_id":"24F9549A-B435-11E9-9278-68D0E5697425","grant_number":"715767"},{"_id":"2508E324-B435-11E9-9278-68D0E5697425","call_identifier":"H2020","name":"Distributed 3D Object Design","grant_number":"642841"}],"language":[{"iso":"eng"}],"issue":"4","isi":1},{"volume":36,"date_created":"2018-12-11T11:46:44Z","file_date_updated":"2020-07-14T12:46:35Z","date_updated":"2023-09-07T13:11:15Z","abstract":[{"text":"Color texture reproduction in 3D printing commonly ignores volumetric light transport (cross-talk) between surface points on a 3D print. Such light diffusion leads to significant blur of details and color bleeding, and is particularly severe for highly translucent resin-based print materials. Given their widely varying scattering properties, this cross-talk between surface points strongly depends on the internal structure of the volume surrounding each surface point. Existing scattering-aware methods use simplified models for light diffusion, and often accept the visual blur as an immutable property of the print medium. In contrast, our work counteracts heterogeneous scattering to obtain the impression of a crisp albedo texture on top of the 3D print, by optimizing for a fully volumetric material distribution that preserves the target appearance. Our method employs an efficient numerical optimizer on top of a general Monte-Carlo simulation of heterogeneous scattering, supported by a practical calibration procedure to obtain scattering parameters from a given set of printer materials. Despite the inherent translucency of the medium, we reproduce detailed surface textures on 3D prints. We evaluate our system using a commercial, five-tone 3D print process and compare against the printer’s native color texturing mode, demonstrating that our method preserves high-frequency features well without having to compromise on color gamut.","lang":"eng"}],"month":"11","type":"journal_article","oa_version":"Submitted Version","_id":"486","year":"2017","date_published":"2017-11-20T00:00:00Z","ddc":["003","000","005"],"oa":1,"publication_status":"published","has_accepted_license":"1","intvolume":"        36","related_material":{"record":[{"status":"public","id":"8386","relation":"dissertation_contains"}]},"citation":{"ama":"Elek O, Sumin D, Zhang R, et al. Scattering-aware texture reproduction for 3D printing. <i>ACM Transactions on Graphics</i>. 2017;36(6). doi:<a href=\"https://doi.org/10.1145/3130800.3130890\">10.1145/3130800.3130890</a>","ista":"Elek O, Sumin D, Zhang R, Weyrich T, Myszkowski K, Bickel B, Wilkie A, Krivanek J. 2017. Scattering-aware texture reproduction for 3D printing. ACM Transactions on Graphics. 36(6), 241.","mla":"Elek, Oskar, et al. “Scattering-Aware Texture Reproduction for 3D Printing.” <i>ACM Transactions on Graphics</i>, vol. 36, no. 6, 241, ACM, 2017, doi:<a href=\"https://doi.org/10.1145/3130800.3130890\">10.1145/3130800.3130890</a>.","apa":"Elek, O., Sumin, D., Zhang, R., Weyrich, T., Myszkowski, K., Bickel, B., … Krivanek, J. (2017). Scattering-aware texture reproduction for 3D printing. <i>ACM Transactions on Graphics</i>. ACM. <a href=\"https://doi.org/10.1145/3130800.3130890\">https://doi.org/10.1145/3130800.3130890</a>","ieee":"O. Elek <i>et al.</i>, “Scattering-aware texture reproduction for 3D printing,” <i>ACM Transactions on Graphics</i>, vol. 36, no. 6. ACM, 2017.","chicago":"Elek, Oskar, Denis Sumin, Ran Zhang, Tim Weyrich, Karol Myszkowski, Bernd Bickel, Alexander Wilkie, and Jaroslav Krivanek. “Scattering-Aware Texture Reproduction for 3D Printing.” <i>ACM Transactions on Graphics</i>. ACM, 2017. <a href=\"https://doi.org/10.1145/3130800.3130890\">https://doi.org/10.1145/3130800.3130890</a>.","short":"O. Elek, D. Sumin, R. Zhang, T. Weyrich, K. Myszkowski, B. Bickel, A. Wilkie, J. Krivanek, ACM Transactions on Graphics 36 (2017)."},"status":"public","title":"Scattering-aware texture reproduction for 3D printing","article_number":"241","publist_id":"7334","author":[{"full_name":"Elek, Oskar","first_name":"Oskar","last_name":"Elek"},{"last_name":"Sumin","first_name":"Denis","full_name":"Sumin, Denis"},{"last_name":"Zhang","first_name":"Ran","full_name":"Zhang, Ran","id":"4DDBCEB0-F248-11E8-B48F-1D18A9856A87","orcid":"0000-0002-3808-281X"},{"full_name":"Weyrich, Tim","first_name":"Tim","last_name":"Weyrich"},{"first_name":"Karol","last_name":"Myszkowski","full_name":"Myszkowski, Karol"},{"first_name":"Bernd","last_name":"Bickel","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"},{"last_name":"Krivanek","first_name":"Jaroslav","full_name":"Krivanek, Jaroslav"}],"file":[{"date_created":"2018-12-12T10:10:46Z","access_level":"open_access","date_updated":"2020-07-14T12:46:35Z","file_id":"4836","checksum":"48386fa6956c3645fc89594dc898b147","relation":"main_file","content_type":"application/pdf","file_size":107349827,"creator":"system","file_name":"IST-2018-1052-v1+1_ElekSumin2017SGA.pdf"},{"relation":"main_file","content_type":"application/pdf","file_size":4683145,"creator":"bbickel","file_name":"ElekSumin2017SGA_reduced_file_size.pdf","date_created":"2019-12-16T14:48:57Z","access_level":"open_access","date_updated":"2020-07-14T12:46:35Z","file_id":"7189","checksum":"21c89c28fb8d70f6602f752bf997aa0f"}],"day":"20","publication":"ACM Transactions on Graphics","ec_funded":1,"article_processing_charge":"No","scopus_import":1,"article_type":"original","user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","publisher":"ACM","department":[{"_id":"BeBi"}],"doi":"10.1145/3130800.3130890","quality_controlled":"1","publication_identifier":{"issn":["07300301"]},"pubrep_id":"1052","language":[{"iso":"eng"}],"issue":"6","project":[{"grant_number":"642841","call_identifier":"H2020","_id":"2508E324-B435-11E9-9278-68D0E5697425","name":"Distributed 3D Object Design"},{"name":"MATERIALIZABLE: Intelligent fabrication-oriented Computational Design and Modeling","_id":"24F9549A-B435-11E9-9278-68D0E5697425","call_identifier":"H2020","grant_number":"715767"},{"grant_number":"291734","name":"International IST Postdoc Fellowship Programme","_id":"25681D80-B435-11E9-9278-68D0E5697425","call_identifier":"FP7"}]},{"author":[{"last_name":"Zhang","first_name":"Ran","full_name":"Zhang, Ran","id":"4DDBCEB0-F248-11E8-B48F-1D18A9856A87","orcid":"0000-0002-3808-281X"},{"last_name":"Auzinger","first_name":"Thomas","id":"4718F954-F248-11E8-B48F-1D18A9856A87","orcid":"0000-0002-1546-3265","full_name":"Auzinger, Thomas"},{"full_name":"Ceylan, Duygu","last_name":"Ceylan","first_name":"Duygu"},{"first_name":"Wilmot","last_name":"Li","full_name":"Li, Wilmot"},{"first_name":"Bernd","last_name":"Bickel","id":"49876194-F248-11E8-B48F-1D18A9856A87","orcid":"0000-0001-6511-9385","full_name":"Bickel, Bernd"}],"day":"01","file":[{"date_updated":"2018-12-12T10:09:05Z","file_id":"4728","date_created":"2018-12-12T10:09:05Z","access_level":"open_access","file_name":"IST-2018-1050-v1+1_MechRet.pdf","relation":"main_file","content_type":"application/pdf","file_size":25463895,"creator":"system"}],"article_number":"81","title":"Functionality-aware retargeting of mechanisms to 3D shapes","publist_id":"6396","publisher":"ACM","user_id":"c635000d-4b10-11ee-a964-aac5a93f6ac1","department":[{"_id":"BeBi"}],"ec_funded":1,"article_processing_charge":"No","scopus_import":"1","publication_identifier":{"issn":["07300301"]},"pubrep_id":"1050","doi":"10.1145/3072959.3073710","quality_controlled":"1","project":[{"_id":"2508E324-B435-11E9-9278-68D0E5697425","call_identifier":"H2020","name":"Distributed 3D Object Design","grant_number":"642841"},{"call_identifier":"H2020","_id":"24F9549A-B435-11E9-9278-68D0E5697425","name":"MATERIALIZABLE: Intelligent fabrication-oriented Computational Design and Modeling","grant_number":"715767"}],"conference":{"end_date":"2017-08-03","name":"SIGGRAPH: Computer Graphics and Interactive Techniques","location":"Los Angeles, CA, United States ","start_date":"2017-07-30"},"isi":1,"issue":"4","language":[{"iso":"eng"}],"oa_version":"Submitted Version","type":"conference","month":"06","date_updated":"2023-09-22T09:49:31Z","abstract":[{"text":"  We present an interactive design system to create functional mechanical  objects. Our computational approach allows novice users to retarget an  existing mechanical template to a user-specified input shape. Our proposed  representation for a mechanical template encodes a parameterized mechanism,  mechanical constraints that ensure a physically valid configuration, spatial relationships of mechanical parts to the user-provided shape, and functional constraints that specify an intended functionality. We provide an intuitive interface and optimization-in-the-loop approach for finding a valid  configuration of the mechanism and the shape to ensure that higher-level  functional goals are met. Our algorithm interactively optimizes the mechanism  while the user manipulates the placement of mechanical components and the shape. Our system allows users to efficiently explore various design choices and to synthesize customized mechanical objects that can be fabricated with rapid prototyping technologies. We demonstrate the efficacy of our approach by retargeting various mechanical templates to different shapes and fabricating the resulting functional mechanical objects.\r\n","lang":"eng"}],"volume":36,"file_date_updated":"2018-12-12T10:09:05Z","date_created":"2018-12-11T11:49:38Z","year":"2017","_id":"1002","publication_status":"published","oa":1,"has_accepted_license":"1","ddc":["003","004"],"date_published":"2017-06-01T00:00:00Z","alternative_title":["ACM Transactions on Graphics"],"status":"public","external_id":{"isi":["000406432100049"]},"intvolume":"        36","related_material":{"record":[{"relation":"dissertation_contains","status":"public","id":"8386"}]},"citation":{"ieee":"R. Zhang, T. Auzinger, D. Ceylan, W. Li, and B. Bickel, “Functionality-aware retargeting of mechanisms to 3D shapes,” presented at the SIGGRAPH: Computer Graphics and Interactive Techniques, Los Angeles, CA, United States , 2017, vol. 36, no. 4.","chicago":"Zhang, Ran, Thomas Auzinger, Duygu Ceylan, Wilmot Li, and Bernd Bickel. “Functionality-Aware Retargeting of Mechanisms to 3D Shapes,” Vol. 36. ACM, 2017. <a href=\"https://doi.org/10.1145/3072959.3073710\">https://doi.org/10.1145/3072959.3073710</a>.","short":"R. Zhang, T. Auzinger, D. Ceylan, W. Li, B. Bickel, in:, ACM, 2017.","ama":"Zhang R, Auzinger T, Ceylan D, Li W, Bickel B. Functionality-aware retargeting of mechanisms to 3D shapes. In: Vol 36. ACM; 2017. doi:<a href=\"https://doi.org/10.1145/3072959.3073710\">10.1145/3072959.3073710</a>","ista":"Zhang R, Auzinger T, Ceylan D, Li W, Bickel B. 2017. Functionality-aware retargeting of mechanisms to 3D shapes. SIGGRAPH: Computer Graphics and Interactive Techniques, ACM Transactions on Graphics, vol. 36, 81.","mla":"Zhang, Ran, et al. <i>Functionality-Aware Retargeting of Mechanisms to 3D Shapes</i>. Vol. 36, no. 4, 81, ACM, 2017, doi:<a href=\"https://doi.org/10.1145/3072959.3073710\">10.1145/3072959.3073710</a>.","apa":"Zhang, R., Auzinger, T., Ceylan, D., Li, W., &#38; Bickel, B. (2017). Functionality-aware retargeting of mechanisms to 3D shapes (Vol. 36). Presented at the SIGGRAPH: Computer Graphics and Interactive Techniques, Los Angeles, CA, United States : ACM. <a href=\"https://doi.org/10.1145/3072959.3073710\">https://doi.org/10.1145/3072959.3073710</a>"}}]