[{"year":"2023","isi":1,"publication":"ACM Transactions on Graphics","day":"17","date_created":"2023-07-23T22:01:13Z","date_published":"2023-03-17T00:00:00Z","doi":"10.1145/3575859","acknowledgement":"This work was supported in part by grants from the NSFC (61972232), Science and Technology Program of Shenzhen, China (CJGJZD20200617102202007). ","oa":1,"publisher":"Association for Computing Machinery","quality_controlled":"1","citation":{"mla":"Zhong, Fanchao, et al. “As-Continuous-As-Possible Extrusion-Based Fabrication of Surface Models.” ACM Transactions on Graphics, vol. 42, no. 3, 26, Association for Computing Machinery, 2023, doi:10.1145/3575859.","short":"F. Zhong, Y. Xu, H. Zhao, L. Lu, ACM Transactions on Graphics 42 (2023).","ieee":"F. Zhong, Y. Xu, H. Zhao, and L. Lu, “As-Continuous-As-Possible extrusion-based fabrication of surface models,” ACM Transactions on Graphics, vol. 42, no. 3. Association for Computing Machinery, 2023.","ama":"Zhong F, Xu Y, Zhao H, Lu L. As-Continuous-As-Possible extrusion-based fabrication of surface models. ACM Transactions on Graphics. 2023;42(3). doi:10.1145/3575859","apa":"Zhong, F., Xu, Y., Zhao, H., & Lu, L. (2023). As-Continuous-As-Possible extrusion-based fabrication of surface models. ACM Transactions on Graphics. Association for Computing Machinery. https://doi.org/10.1145/3575859","chicago":"Zhong, Fanchao, Yonglai Xu, Haisen Zhao, and Lin Lu. “As-Continuous-As-Possible Extrusion-Based Fabrication of Surface Models.” ACM Transactions on Graphics. Association for Computing Machinery, 2023. https://doi.org/10.1145/3575859.","ista":"Zhong F, Xu Y, Zhao H, Lu L. 2023. As-Continuous-As-Possible extrusion-based fabrication of surface models. ACM Transactions on Graphics. 42(3), 26."},"user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","external_id":{"isi":["001018739600002"],"arxiv":["2201.02374"]},"article_processing_charge":"No","author":[{"first_name":"Fanchao","full_name":"Zhong, Fanchao","last_name":"Zhong"},{"first_name":"Yonglai","full_name":"Xu, Yonglai","last_name":"Xu"},{"last_name":"Zhao","orcid":"0000-0002-6389-1045","full_name":"Zhao, Haisen","id":"fb7f793a-80d1-11eb-8869-d56e5b2a8ff4","first_name":"Haisen"},{"first_name":"Lin","full_name":"Lu, Lin","last_name":"Lu"}],"title":"As-Continuous-As-Possible extrusion-based fabrication of surface models","article_number":"26","publication_status":"published","publication_identifier":{"eissn":["1557-7368"],"issn":["0730-0301"]},"language":[{"iso":"eng"}],"volume":42,"issue":"3","abstract":[{"text":"In this study, we propose a computational framework for optimizing the continuity of the toolpath in fabricating surface models on an extrusion-based 3D printer. Toolpath continuity is a critical issue that influences both the quality and the efficiency of extrusion-based fabrication. Transfer moves lead to rough and bumpy surfaces, where this phenomenon worsens for materials with large viscosity, like clay. The effects of continuity on the surface models are even more severe in terms of the quality of the surface and the stability of the model. We introduce a criterion called the one–path patch (OPP) to represent a patch on the surface of the shell that can be traversed along one path by considering the constraints on fabrication. We study the properties of the OPPs and their merging operations to propose a bottom-up OPP merging procedure to decompose the given shell surface into a minimal number of OPPs, and to generate the “as-continuous-as-possible” (ACAP) toolpath. Furthermore, we augment the path planning algorithm with a curved-layer printing scheme that reduces staircase defects and improves the continuity of the toolpath by connecting multiple segments. We evaluated the ACAP algorithm on ceramic and thermoplastic materials, and the results showed that it improves the fabrication of surface models in terms of both efficiency and surface quality.","lang":"eng"}],"oa_version":"Preprint","main_file_link":[{"open_access":"1","url":"https://doi.org/10.48550/arXiv.2201.02374"}],"scopus_import":"1","intvolume":" 42","month":"03","date_updated":"2023-12-13T11:34:59Z","department":[{"_id":"BeBi"}],"_id":"13265","article_type":"original","type":"journal_article","status":"public"},{"project":[{"_id":"265CB4D0-B435-11E9-9278-68D0E5697425","call_identifier":"FWF","grant_number":"I03600","name":"Optical control of synaptic function via adhesion molecules"},{"call_identifier":"FWF","_id":"2548AE96-B435-11E9-9278-68D0E5697425","name":"Molecular Drug Targets","grant_number":"W1232-B24"},{"name":"The Wittgenstein Prize","grant_number":"Z00312","call_identifier":"FWF","_id":"25C5A090-B435-11E9-9278-68D0E5697425"},{"name":"High content imaging to decode human immune cell interactions in health and allergic disease","_id":"23889792-32DE-11EA-91FC-C7463DDC885E"},{"call_identifier":"H2020","_id":"2564DBCA-B435-11E9-9278-68D0E5697425","name":"International IST Doctoral Program","grant_number":"665385"},{"_id":"24F9549A-B435-11E9-9278-68D0E5697425","call_identifier":"H2020","grant_number":"715767","name":"MATERIALIZABLE: Intelligent fabrication-oriented Computational Design and Modeling"},{"grant_number":"715508","name":"Probing the Reversibility of Autism Spectrum Disorders by Employing in vivo and in vitro Models","_id":"25444568-B435-11E9-9278-68D0E5697425","call_identifier":"H2020"},{"call_identifier":"H2020","_id":"25B7EB9E-B435-11E9-9278-68D0E5697425","grant_number":"692692","name":"Biophysics and circuit function of a giant cortical glumatergic synapse"},{"_id":"fc2be41b-9c52-11eb-aca3-faa90aa144e9","call_identifier":"H2020","name":"Synaptic computations of the hippocampal CA3 circuitry","grant_number":"101026635"},{"_id":"2668BFA0-B435-11E9-9278-68D0E5697425","name":"High-speed 3D-nanoscopy to study the role of adhesion during 3D cell migration","grant_number":"LT00057"}],"title":"Dense 4D nanoscale reconstruction of living brain tissue","author":[{"orcid":"0000-0002-2340-7431","full_name":"Velicky, Philipp","last_name":"Velicky","id":"39BDC62C-F248-11E8-B48F-1D18A9856A87","first_name":"Philipp"},{"full_name":"Miguel Villalba, Eder","orcid":"0000-0001-5665-0430","last_name":"Miguel Villalba","first_name":"Eder","id":"3FB91342-F248-11E8-B48F-1D18A9856A87"},{"first_name":"Julia M","id":"443DB6DE-F248-11E8-B48F-1D18A9856A87","full_name":"Michalska, Julia M","orcid":"0000-0003-3862-1235","last_name":"Michalska"},{"last_name":"Lyudchik","full_name":"Lyudchik, Julia","first_name":"Julia","id":"46E28B80-F248-11E8-B48F-1D18A9856A87"},{"first_name":"Donglai","full_name":"Wei, Donglai","last_name":"Wei"},{"first_name":"Zudi","full_name":"Lin, Zudi","last_name":"Lin"},{"orcid":"0000-0002-8698-3823","full_name":"Watson, Jake","last_name":"Watson","first_name":"Jake","id":"63836096-4690-11EA-BD4E-32803DDC885E"},{"full_name":"Troidl, Jakob","last_name":"Troidl","first_name":"Jakob"},{"first_name":"Johanna","last_name":"Beyer","full_name":"Beyer, Johanna"},{"last_name":"Ben Simon","full_name":"Ben Simon, Yoav","id":"43DF3136-F248-11E8-B48F-1D18A9856A87","first_name":"Yoav"},{"full_name":"Sommer, Christoph M","orcid":"0000-0003-1216-9105","last_name":"Sommer","first_name":"Christoph M","id":"4DF26D8C-F248-11E8-B48F-1D18A9856A87"},{"full_name":"Jahr, Wiebke","last_name":"Jahr","id":"425C1CE8-F248-11E8-B48F-1D18A9856A87","first_name":"Wiebke"},{"full_name":"Cenameri, Alban","last_name":"Cenameri","first_name":"Alban","id":"9ac8f577-2357-11eb-997a-e566c5550886"},{"first_name":"Johannes","full_name":"Broichhagen, Johannes","last_name":"Broichhagen"},{"first_name":"Seth G.N.","full_name":"Grant, Seth G.N.","last_name":"Grant"},{"last_name":"Jonas","orcid":"0000-0001-5001-4804","full_name":"Jonas, Peter M","first_name":"Peter M","id":"353C1B58-F248-11E8-B48F-1D18A9856A87"},{"last_name":"Novarino","full_name":"Novarino, Gaia","orcid":"0000-0002-7673-7178","id":"3E57A680-F248-11E8-B48F-1D18A9856A87","first_name":"Gaia"},{"last_name":"Pfister","full_name":"Pfister, Hanspeter","first_name":"Hanspeter"},{"first_name":"Bernd","id":"49876194-F248-11E8-B48F-1D18A9856A87","full_name":"Bickel, Bernd","orcid":"0000-0001-6511-9385","last_name":"Bickel"},{"first_name":"Johann G","id":"42EFD3B6-F248-11E8-B48F-1D18A9856A87","orcid":"0000-0001-8559-3973","full_name":"Danzl, Johann G","last_name":"Danzl"}],"external_id":{"isi":["001025621500001"],"pmid":["37429995"]},"article_processing_charge":"Yes","user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","citation":{"apa":"Velicky, P., Miguel Villalba, E., Michalska, J. M., Lyudchik, J., Wei, D., Lin, Z., … Danzl, J. G. (2023). Dense 4D nanoscale reconstruction of living brain tissue. Nature Methods. Springer Nature. https://doi.org/10.1038/s41592-023-01936-6","ama":"Velicky P, Miguel Villalba E, Michalska JM, et al. Dense 4D nanoscale reconstruction of living brain tissue. Nature Methods. 2023;20:1256-1265. doi:10.1038/s41592-023-01936-6","ieee":"P. Velicky et al., “Dense 4D nanoscale reconstruction of living brain tissue,” Nature Methods, vol. 20. Springer Nature, pp. 1256–1265, 2023.","short":"P. Velicky, E. Miguel Villalba, J.M. Michalska, J. Lyudchik, D. Wei, Z. Lin, J. Watson, J. Troidl, J. Beyer, Y. Ben Simon, C.M. Sommer, W. Jahr, A. Cenameri, J. Broichhagen, S.G.N. Grant, P.M. Jonas, G. Novarino, H. Pfister, B. Bickel, J.G. Danzl, Nature Methods 20 (2023) 1256–1265.","mla":"Velicky, Philipp, et al. “Dense 4D Nanoscale Reconstruction of Living Brain Tissue.” Nature Methods, vol. 20, Springer Nature, 2023, pp. 1256–65, doi:10.1038/s41592-023-01936-6.","ista":"Velicky P, Miguel Villalba E, Michalska JM, Lyudchik J, Wei D, Lin Z, Watson J, Troidl J, Beyer J, Ben Simon Y, Sommer CM, Jahr W, Cenameri A, Broichhagen J, Grant SGN, Jonas PM, Novarino G, Pfister H, Bickel B, Danzl JG. 2023. Dense 4D nanoscale reconstruction of living brain tissue. Nature Methods. 20, 1256–1265.","chicago":"Velicky, Philipp, Eder Miguel Villalba, Julia M Michalska, Julia Lyudchik, Donglai Wei, Zudi Lin, Jake Watson, et al. “Dense 4D Nanoscale Reconstruction of Living Brain Tissue.” Nature Methods. Springer Nature, 2023. https://doi.org/10.1038/s41592-023-01936-6."},"publisher":"Springer Nature","quality_controlled":"1","oa":1,"acknowledgement":"We thank J. Vorlaufer, N. Agudelo and A. Wartak for microscope maintenance and troubleshooting, C. Kreuzinger and A. Freeman for technical assistance, M. Šuplata for hardware control support and M. Cunha dos Santos for initial exploration of software. We\r\nthank P. Henderson for advice on deep-learning training and M. Sixt, S. Boyd and T. Weiss for discussions and critical reading of the manuscript. L. Lavis (Janelia Research Campus) generously provided the JF585-HaloTag ligand. We acknowledge expert support by IST\r\nAustria’s scientific computing, imaging and optics, preclinical, library and laboratory support facilities and by the Miba machine shop. We gratefully acknowledge funding by the following sources: Austrian Science Fund (F.W.F.) grant no. I3600-B27 (J.G.D.), grant no. DK W1232\r\n(J.G.D. and J.M.M.) and grant no. Z 312-B27, Wittgenstein award (P.J.); the Gesellschaft für Forschungsförderung NÖ grant no. LSC18-022 (J.G.D.); an ISTA Interdisciplinary project grant (J.G.D. and B.B.); the European Union’s Horizon 2020 research and innovation programme,\r\nMarie-Skłodowska Curie grant 665385 (J.M.M. and J.L.); the European Union’s Horizon 2020 research and innovation programme, European Research Council grant no. 715767, MATERIALIZABLE (B.B.); grant no. 715508, REVERSEAUTISM (G.N.); grant no. 695568, SYNNOVATE (S.G.N.G.); and grant no. 692692, GIANTSYN (P.J.); the Simons\r\nFoundation Autism Research Initiative grant no. 529085 (S.G.N.G.); the Wellcome Trust Technology Development grant no. 202932 (S.G.N.G.); the Marie Skłodowska-Curie Actions Individual Fellowship no. 101026635 under the EU Horizon 2020 program (J.F.W.);\r\nthe Human Frontier Science Program postdoctoral fellowship LT000557/2018 (W.J.); and the National Science Foundation grant no. IIS-1835231 (H.P.) and NCS-FO-2124179 (H.P.).","date_published":"2023-08-01T00:00:00Z","doi":"10.1038/s41592-023-01936-6","date_created":"2023-07-23T22:01:13Z","page":"1256-1265","day":"01","publication":"Nature Methods","isi":1,"year":"2023","status":"public","article_type":"original","type":"journal_article","_id":"13267","department":[{"_id":"PeJo"},{"_id":"GaNo"},{"_id":"BeBi"},{"_id":"JoDa"},{"_id":"Bio"}],"date_updated":"2024-01-10T08:37:48Z","month":"08","intvolume":" 20","scopus_import":"1","main_file_link":[{"url":"https://doi.org/10.1038/s41592-023-01936-6","open_access":"1"}],"oa_version":"Published Version","pmid":1,"acknowledged_ssus":[{"_id":"ScienComp"},{"_id":"Bio"},{"_id":"PreCl"},{"_id":"E-Lib"},{"_id":"LifeSc"},{"_id":"M-Shop"}],"abstract":[{"text":"Three-dimensional (3D) reconstruction of living brain tissue down to an individual synapse level would create opportunities for decoding the dynamics and structure–function relationships of the brain’s complex and dense information processing network; however, this has been hindered by insufficient 3D resolution, inadequate signal-to-noise ratio and prohibitive light burden in optical imaging, whereas electron microscopy is inherently static. Here we solved these challenges by developing an integrated optical/machine-learning technology, LIONESS (live information-optimized nanoscopy enabling saturated segmentation). This leverages optical modifications to stimulated emission depletion microscopy in comprehensively, extracellularly labeled tissue and previous information on sample structure via machine learning to simultaneously achieve isotropic super-resolution, high signal-to-noise ratio and compatibility with living tissue. This allows dense deep-learning-based instance segmentation and 3D reconstruction at a synapse level, incorporating molecular, activity and morphodynamic information. LIONESS opens up avenues for studying the dynamic functional (nano-)architecture of living brain tissue.","lang":"eng"}],"related_material":{"link":[{"url":"https://github.com/danzllab/LIONESS","relation":"software"}],"record":[{"status":"public","id":"12817","relation":"research_data"},{"relation":"shorter_version","id":"14770","status":"public"}]},"volume":20,"ec_funded":1,"language":[{"iso":"eng"}],"publication_identifier":{"issn":["1548-7091"],"eissn":["1548-7105"]},"publication_status":"published"},{"acknowledgement":"This work is supported by FWF Lise Meitner (Grant M 3319), Spanish Agencia Estatal de Investigación (project PID2022-141539NBI00), European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme (grant agreement\r\nN◦ 725253–EyeCode), Swiss National Science Foundation (Grant no. 200502), and academic gifts from Meta. We thank Dmitry Lubyako and Ali Özgür Yöntem for building the turntable for our experiment.","oa":1,"quality_controlled":"1","publisher":"Association for Computing Machinery","publication":"Proceedings of the SIGGRAPH Asia 2023 Conference","day":"10","year":"2023","has_accepted_license":"1","date_created":"2024-01-14T23:00:57Z","doi":"10.1145/3610548.3618226","date_published":"2023-12-10T00:00:00Z","article_number":"90","project":[{"_id":"eb901961-77a9-11ec-83b8-f5c883a62027","name":"Perception-Aware Appearance Fabrication","grant_number":"M03319"}],"user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","citation":{"ieee":"B. Chen et al., “The effect of display capabilities on the gloss consistency between real and virtual objects,” in Proceedings of the SIGGRAPH Asia 2023 Conference, Sydney, Australia, 2023.","short":"B. Chen, A. Jindal, M. Piovarci, C. Wang, H.P. Seidel, P. Didyk, K. Myszkowski, A. Serrano, R.K. Mantiuk, in:, Proceedings of the SIGGRAPH Asia 2023 Conference, Association for Computing Machinery, 2023.","apa":"Chen, B., Jindal, A., Piovarci, M., Wang, C., Seidel, H. P., Didyk, P., … Mantiuk, R. K. (2023). The effect of display capabilities on the gloss consistency between real and virtual objects. In Proceedings of the SIGGRAPH Asia 2023 Conference. Sydney, Australia: Association for Computing Machinery. https://doi.org/10.1145/3610548.3618226","ama":"Chen B, Jindal A, Piovarci M, et al. The effect of display capabilities on the gloss consistency between real and virtual objects. In: Proceedings of the SIGGRAPH Asia 2023 Conference. Association for Computing Machinery; 2023. doi:10.1145/3610548.3618226","mla":"Chen, Bin, et al. “The Effect of Display Capabilities on the Gloss Consistency between Real and Virtual Objects.” Proceedings of the SIGGRAPH Asia 2023 Conference, 90, Association for Computing Machinery, 2023, doi:10.1145/3610548.3618226.","ista":"Chen B, Jindal A, Piovarci M, Wang C, Seidel HP, Didyk P, Myszkowski K, Serrano A, Mantiuk RK. 2023. The effect of display capabilities on the gloss consistency between real and virtual objects. Proceedings of the SIGGRAPH Asia 2023 Conference. SIGGRAPH: Computer Graphics and Interactive Techniques Conference, 90.","chicago":"Chen, Bin, Akshay Jindal, Michael Piovarci, Chao Wang, Hans Peter Seidel, Piotr Didyk, Karol Myszkowski, Ana Serrano, and Rafał K. Mantiuk. “The Effect of Display Capabilities on the Gloss Consistency between Real and Virtual Objects.” In Proceedings of the SIGGRAPH Asia 2023 Conference. Association for Computing Machinery, 2023. https://doi.org/10.1145/3610548.3618226."},"title":"The effect of display capabilities on the gloss consistency between real and virtual objects","article_processing_charge":"Yes (in subscription journal)","author":[{"full_name":"Chen, Bin","last_name":"Chen","first_name":"Bin"},{"first_name":"Akshay","full_name":"Jindal, Akshay","last_name":"Jindal"},{"full_name":"Piovarci, Michael","orcid":"0000-0002-5062-4474","last_name":"Piovarci","id":"62E473F4-5C99-11EA-A40E-AF823DDC885E","first_name":"Michael"},{"first_name":"Chao","full_name":"Wang, Chao","last_name":"Wang"},{"full_name":"Seidel, Hans Peter","last_name":"Seidel","first_name":"Hans Peter"},{"first_name":"Piotr","last_name":"Didyk","full_name":"Didyk, Piotr"},{"first_name":"Karol","full_name":"Myszkowski, Karol","last_name":"Myszkowski"},{"last_name":"Serrano","full_name":"Serrano, Ana","first_name":"Ana"},{"first_name":"Rafał K.","full_name":"Mantiuk, Rafał K.","last_name":"Mantiuk"}],"oa_version":"Published Version","abstract":[{"text":"A faithful reproduction of gloss is inherently difficult because of the limited dynamic range, peak luminance, and 3D capabilities of display devices. This work investigates how the display capabilities affect gloss appearance with respect to a real-world reference object. To this end, we employ an accurate imaging pipeline to achieve a perceptual gloss match between a virtual and real object presented side-by-side on an augmented-reality high-dynamic-range (HDR) stereoscopic display, which has not been previously attained to this extent. Based on this precise gloss reproduction, we conduct a series of gloss matching experiments to study how gloss perception degrades based on individual factors: object albedo, display luminance, dynamic range, stereopsis, and tone mapping. We support the study with a detailed analysis of individual factors, followed by an in-depth discussion on the observed perceptual effects. Our experiments demonstrate that stereoscopic presentation has a limited effect on the gloss matching task on our HDR display. However, both reduced luminance and dynamic range of the display reduce the perceived gloss. This means that the visual system cannot compensate for the changes in gloss appearance across luminance (lack of gloss constancy), and the tone mapping operator should be carefully selected when reproducing gloss on a low dynamic range (LDR) display.","lang":"eng"}],"month":"12","scopus_import":"1","language":[{"iso":"eng"}],"file":[{"creator":"dernst","date_updated":"2024-01-17T08:33:06Z","file_size":95967451,"date_created":"2024-01-17T08:33:06Z","file_name":"2023_SA_Chen.pdf","access_level":"open_access","relation":"main_file","content_type":"application/pdf","file_id":"14823","checksum":"8abe27432ed222b50d1af9b3388db1b0","success":1}],"publication_status":"published","publication_identifier":{"isbn":["9798400703157"]},"_id":"14798","status":"public","conference":{"start_date":"2023-12-12","end_date":"2023-12-15","location":"Sydney, Australia","name":"SIGGRAPH: Computer Graphics and Interactive Techniques Conference"},"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)"},"type":"conference","ddc":["000"],"date_updated":"2024-01-17T08:38:35Z","file_date_updated":"2024-01-17T08:33:06Z","department":[{"_id":"BeBi"}]},{"status":"public","keyword":["PCB design and layout","Mesh geometry models"],"article_type":"original","type":"journal_article","conference":{"name":"SIGGRAPH: Computer Graphics and Interactive Techniques Conference","start_date":"2023-08-06","end_date":"2023-08-10","location":"Los Angeles, CA, United States"},"_id":"13049","file_date_updated":"2023-06-20T12:20:51Z","department":[{"_id":"GradSch"},{"_id":"BeBi"}],"ddc":["006"],"date_updated":"2024-01-29T10:30:49Z","month":"07","intvolume":" 42","oa_version":"Submitted Version","acknowledged_ssus":[{"_id":"M-Shop"}],"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."}],"issue":"4","volume":42,"ec_funded":1,"file":[{"content_type":"application/pdf","access_level":"open_access","relation":"main_file","file_id":"13156","checksum":"a0b0ba3b36f43a94388e8824613d812a","success":1,"date_updated":"2023-06-19T11:02:23Z","file_size":78940724,"creator":"dernst","date_created":"2023-06-19T11:02:23Z","file_name":"2023_ACMToG_Freire.pdf"},{"creator":"dernst","file_size":34345905,"date_updated":"2023-06-20T12:20:51Z","file_name":"2023_ACMToG_SuppMaterial_Freire.pdf","date_created":"2023-06-20T12:20:51Z","relation":"main_file","access_level":"open_access","content_type":"application/pdf","success":1,"checksum":"b9206bbb67af82df49b7e7cdbde3410c","file_id":"13157"}],"language":[{"iso":"eng"}],"publication_identifier":{"issn":["0730-0301"],"eissn":["1557-7368"]},"publication_status":"published","project":[{"name":"MATERIALIZABLE: Intelligent fabrication-oriented Computational Design and Modeling","grant_number":"715767","call_identifier":"H2020","_id":"24F9549A-B435-11E9-9278-68D0E5697425"}],"article_number":"142","title":"PCBend: Light up your 3D shapes with foldable circuit boards","author":[{"full_name":"Freire, Marco","last_name":"Freire","first_name":"Marco"},{"last_name":"Bhargava","full_name":"Bhargava, Manas","orcid":"0009-0007-6138-6890","id":"FF8FA64C-AA6A-11E9-99AD-50D4E5697425","first_name":"Manas"},{"id":"2B14B676-F248-11E8-B48F-1D18A9856A87","first_name":"Camille","last_name":"Schreck","full_name":"Schreck, Camille"},{"first_name":"Pierre-Alexandre","last_name":"Hugron","full_name":"Hugron, Pierre-Alexandre"},{"id":"49876194-F248-11E8-B48F-1D18A9856A87","first_name":"Bernd","orcid":"0000-0001-6511-9385","full_name":"Bickel, Bernd","last_name":"Bickel"},{"first_name":"Sylvain","full_name":"Lefebvre, Sylvain","last_name":"Lefebvre"}],"external_id":{"isi":["001044671300108"]},"article_processing_charge":"No","user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","citation":{"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.","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.” Transactions on Graphics. Association for Computing Machinery, 2023. https://doi.org/10.1145/3592411.","short":"M. Freire, M. Bhargava, C. Schreck, P.-A. Hugron, B. Bickel, S. Lefebvre, Transactions on Graphics 42 (2023).","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,” Transactions on Graphics, vol. 42, no. 4. Association for Computing Machinery, 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. Transactions on Graphics. 2023;42(4). doi:10.1145/3592411","apa":"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. Los Angeles, CA, United States: Association for Computing Machinery. https://doi.org/10.1145/3592411","mla":"Freire, Marco, et al. “PCBend: Light up Your 3D Shapes with Foldable Circuit Boards.” Transactions on Graphics, vol. 42, no. 4, 142, Association for Computing Machinery, 2023, doi:10.1145/3592411."},"quality_controlled":"1","publisher":"Association for Computing Machinery","oa":1,"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).","date_published":"2023-07-26T00:00:00Z","doi":"10.1145/3592411","date_created":"2023-05-22T08:37:04Z","day":"26","publication":"Transactions on Graphics","isi":1,"has_accepted_license":"1","year":"2023"},{"author":[{"orcid":"0000-0002-5062-4474","full_name":"Piovarci, Michael","last_name":"Piovarci","first_name":"Michael","id":"62E473F4-5C99-11EA-A40E-AF823DDC885E"},{"first_name":"Alexandre","last_name":"Chapiro","full_name":"Chapiro, Alexandre"},{"id":"49876194-F248-11E8-B48F-1D18A9856A87","first_name":"Bernd","orcid":"0000-0001-6511-9385","full_name":"Bickel, Bernd","last_name":"Bickel"}],"external_id":{"isi":["001044671300033"]},"article_processing_charge":"No","title":"Skin-Screen: A computational fabrication framework for color tattoos","citation":{"mla":"Piovarci, Michael, et al. “Skin-Screen: A Computational Fabrication Framework for Color Tattoos.” Transactions on Graphics, vol. 42, no. 4, 67, Association for Computing Machinery, 2023, doi:10.1145/3592432.","ieee":"M. Piovarci, A. Chapiro, and B. Bickel, “Skin-Screen: A computational fabrication framework for color tattoos,” Transactions on Graphics, vol. 42, no. 4. Association for Computing Machinery, 2023.","short":"M. Piovarci, A. Chapiro, B. Bickel, Transactions on Graphics 42 (2023).","ama":"Piovarci M, Chapiro A, Bickel B. Skin-Screen: A computational fabrication framework for color tattoos. Transactions on Graphics. 2023;42(4). doi:10.1145/3592432","apa":"Piovarci, M., Chapiro, A., & Bickel, B. (2023). Skin-Screen: A computational fabrication framework for color tattoos. Transactions on Graphics. Los Angeles, CA, United States: Association for Computing Machinery. https://doi.org/10.1145/3592432","chicago":"Piovarci, Michael, Alexandre Chapiro, and Bernd Bickel. “Skin-Screen: A Computational Fabrication Framework for Color Tattoos.” Transactions on Graphics. Association for Computing Machinery, 2023. https://doi.org/10.1145/3592432.","ista":"Piovarci M, Chapiro A, Bickel B. 2023. Skin-Screen: A computational fabrication framework for color tattoos. Transactions on Graphics. 42(4), 67."},"user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","project":[{"_id":"eb901961-77a9-11ec-83b8-f5c883a62027","name":"Perception-Aware Appearance Fabrication","grant_number":"M03319"}],"article_number":"67","date_published":"2023-07-26T00:00:00Z","doi":"10.1145/3592432","date_created":"2023-05-16T09:39:14Z","has_accepted_license":"1","isi":1,"year":"2023","day":"26","publication":"Transactions on Graphics","quality_controlled":"1","publisher":"Association for Computing Machinery","oa":1,"acknowledgement":"We thank Todor Asenov and the Miba Machine Shop for their help in assembling the tattoo machine and manufacturing the substrates. We thank Geysler Rodrigues for the insightful discussions on tattooing practices from a professional artist's perspective. We thank Maria Fernanda Portugal for sharing a doctor's perspective on medical applications of tattoos. This work is graciously supported by the FWF Lise Meitner (Grant M 3319).","department":[{"_id":"BeBi"}],"file_date_updated":"2023-05-16T09:38:25Z","date_updated":"2024-01-29T10:27:23Z","ddc":["004"],"type":"journal_article","article_type":"original","conference":{"start_date":"2023-08-06","end_date":"2023-08-10","location":"Los Angeles, CA, United States","name":"SIGGRAPH: Computer Graphics and Interactive Techniques Conference"},"status":"public","keyword":["appearance","modeling","reproduction","tattoo","skin color","gamut mapping","ink-optimization","prosthetic"],"_id":"12984","issue":"4","volume":42,"publication_identifier":{"issn":["0730-0301"],"eissn":["1557-7368"]},"publication_status":"published","file":[{"creator":"mpiovarc","date_updated":"2023-05-16T09:38:25Z","file_size":30817343,"date_created":"2023-05-16T09:38:25Z","file_name":"Piovarci2023.pdf","access_level":"open_access","relation":"main_file","content_type":"application/pdf","checksum":"5f0a6867689e025a661bd0b4fd90b821","file_id":"12985","success":1}],"language":[{"iso":"eng"}],"month":"07","intvolume":" 42","acknowledged_ssus":[{"_id":"M-Shop"}],"abstract":[{"text":"Tattoos are a highly popular medium, with both artistic and medical applications. Although the mechanical process of tattoo application has evolved historically, the results are reliant on the artisanal skill of the artist. This can be especially challenging for some skin tones, or in cases where artists lack experience. We provide the first systematic overview of tattooing as a computational fabrication technique. We built an automated tattooing rig and a recipe for the creation of silicone sheets mimicking realistic skin tones, which allowed us to create an accurate model predicting tattoo appearance. This enables several exciting applications including tattoo previewing, color retargeting, novel ink spectra optimization, color-accurate prosthetics, and more.","lang":"eng"}],"oa_version":"Submitted Version"},{"acknowledgement":"We thank Matthew S Zurawski for the 3D model of the car speed shape. This research has been supported by the Swiss National Science Foundation (SNSF, Grant 200502) and the FWF Lise Meitner (Grant M 3319).","oa":1,"quality_controlled":"1","publisher":"Association for Computing Machinery","publication":"SIGGRAPH ’23 Conference Proceedings","day":"23","year":"2023","has_accepted_license":"1","isi":1,"date_created":"2023-05-16T09:34:13Z","date_published":"2023-07-23T00:00:00Z","doi":"10.1145/3588432.3591546","article_number":"21","project":[{"grant_number":"M03319","name":"Perception-Aware Appearance Fabrication","_id":"eb901961-77a9-11ec-83b8-f5c883a62027"}],"user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","citation":{"mla":"Condor, Jorge, et al. “Gloss-Aware Color Correction for 3D Printing.” SIGGRAPH ’23 Conference Proceedings, 21, Association for Computing Machinery, 2023, doi:10.1145/3588432.3591546.","ama":"Condor J, Piovarci M, Bickel B, Didyk P. Gloss-aware color correction for 3D printing. In: SIGGRAPH ’23 Conference Proceedings. Association for Computing Machinery; 2023. doi:10.1145/3588432.3591546","apa":"Condor, J., Piovarci, M., Bickel, B., & Didyk, P. (2023). Gloss-aware color correction for 3D printing. In SIGGRAPH ’23 Conference Proceedings. Los Angeles, CA, United States: Association for Computing Machinery. https://doi.org/10.1145/3588432.3591546","short":"J. Condor, M. Piovarci, B. Bickel, P. Didyk, in:, SIGGRAPH ’23 Conference Proceedings, Association for Computing Machinery, 2023.","ieee":"J. Condor, M. Piovarci, B. Bickel, and P. Didyk, “Gloss-aware color correction for 3D printing,” in SIGGRAPH ’23 Conference Proceedings, Los Angeles, CA, United States, 2023.","chicago":"Condor, Jorge, Michael Piovarci, Bernd Bickel, and Piotr Didyk. “Gloss-Aware Color Correction for 3D Printing.” In SIGGRAPH ’23 Conference Proceedings. Association for Computing Machinery, 2023. https://doi.org/10.1145/3588432.3591546.","ista":"Condor J, Piovarci M, Bickel B, Didyk P. 2023. Gloss-aware color correction for 3D printing. SIGGRAPH ’23 Conference Proceedings. SIGGRAPH: Computer Graphics and Interactive Techniques Conference, 21."},"title":"Gloss-aware color correction for 3D printing","article_processing_charge":"No","external_id":{"isi":["001117690500021"]},"author":[{"full_name":"Condor, Jorge","last_name":"Condor","first_name":"Jorge"},{"id":"62E473F4-5C99-11EA-A40E-AF823DDC885E","first_name":"Michael","last_name":"Piovarci","orcid":"0000-0002-5062-4474","full_name":"Piovarci, Michael"},{"last_name":"Bickel","orcid":"0000-0001-6511-9385","full_name":"Bickel, Bernd","first_name":"Bernd","id":"49876194-F248-11E8-B48F-1D18A9856A87"},{"first_name":"Piotr","full_name":"Didyk, Piotr","last_name":"Didyk"}],"oa_version":"Published Version","abstract":[{"text":"Color and gloss are fundamental aspects of surface appearance. State-of-the-art fabrication techniques can manipulate both properties of the printed 3D objects. However, in the context of appearance reproduction, perceptual aspects of color and gloss are usually handled separately, even though previous perceptual studies suggest their interaction. Our work is motivated by previous studies demonstrating a perceived color shift due to a change in the object's gloss, i.e., two samples with the same color but different surface gloss appear as they have different colors. In this paper, we conduct new experiments which support this observation and provide insights into the magnitude and direction of the perceived color change. We use the observations as guidance to design a new method that estimates and corrects the color shift enabling the fabrication of objects with the same perceived color but different surface gloss. We formulate the problem as an optimization procedure solved using differentiable rendering. We evaluate the effectiveness of our method in perceptual experiments with 3D objects fabricated using a multi-material 3D printer and demonstrate potential applications. ","lang":"eng"}],"month":"07","language":[{"iso":"eng"}],"file":[{"file_name":"Condor2023_supplemental.pdf","date_created":"2023-05-16T09:32:50Z","creator":"mpiovarc","file_size":42323971,"date_updated":"2023-05-16T09:32:50Z","success":1,"file_id":"12983","checksum":"84a437739af5d46507928939b20c0c28","relation":"main_file","access_level":"open_access","content_type":"application/pdf"},{"relation":"main_file","access_level":"open_access","content_type":"application/pdf","success":1,"file_id":"14893","checksum":"0f5c8b242e8e7c153c04888c4d0c6f37","creator":"dernst","file_size":26079404,"date_updated":"2024-01-29T10:14:10Z","file_name":"2023_Siggraph_Condor.pdf","date_created":"2024-01-29T10:14:10Z"}],"publication_status":"published","publication_identifier":{"isbn":["9798400701597"]},"_id":"12979","keyword":["color","gloss","perception","color compensation","color management"],"status":"public","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)"},"conference":{"location":"Los Angeles, CA, United States","end_date":"2023-08-10","start_date":"2023-08-06","name":"SIGGRAPH: Computer Graphics and Interactive Techniques Conference"},"type":"conference","ddc":["004"],"date_updated":"2024-02-28T12:52:04Z","file_date_updated":"2024-01-29T10:14:10Z","department":[{"_id":"BeBi"}]},{"oa_version":"Published Version","abstract":[{"text":"Inverse design problems in fabrication-aware shape optimization are typically solved on discrete representations such as polygonal meshes. This thesis argues that there are benefits to treating these problems in the same domain as human designers, namely, the parametric one. One reason is that discretizing a parametric model usually removes the capability of making further manual changes to the design, because the human intent is captured by the shape parameters. Beyond this, knowledge about a design problem can sometimes reveal a structure that is present in a smooth representation, but is fundamentally altered by discretizing. In this case, working in the parametric domain may even simplify the optimization task. We present two lines of research that explore both of these aspects of fabrication-aware shape optimization on parametric representations.\r\n\r\nThe first project studies the design of plane elastic curves and Kirchhoff rods, which are common mathematical models for describing the deformation of thin elastic rods such as beams, ribbons, cables, and hair. Our main contribution is a characterization of all curved shapes that can be attained by bending and twisting elastic rods having a stiffness that is allowed to vary across the length. Elements like these can be manufactured using digital fabrication devices such as 3d printers and digital cutters, and have applications in free-form architecture and soft robotics.\r\n\r\nWe show that the family of curved shapes that can be produced this way admits geometric description that is concise and computationally convenient. In the case of plane curves, the geometric description is intuitive enough to allow a designer to determine whether a curved shape is physically achievable by visual inspection alone. We also present shape optimization algorithms that convert a user-defined curve in the plane or in three dimensions into the geometry of an elastic rod that will naturally deform to follow this curve when its endpoints are attached to a support structure. Implemented in an interactive software design tool, the rod geometry is generated in real time as the user edits a curve and enables fast prototyping. \r\n\r\nThe second project tackles the problem of general-purpose shape optimization on CAD models using a novel variant of the extended finite element method (XFEM). Our goal is the decoupling between the simulation mesh and the CAD model, so no geometry-dependent meshing or remeshing needs to be performed when the CAD parameters change during optimization. This is achieved by discretizing the embedding space of the CAD model, and using a new high-accuracy numerical integration method to enable XFEM on free-form elements bounded by the parametric surface patches of the model. Our simulation is differentiable from the CAD parameters to the simulation output, which enables us to use off-the-shelf gradient-based optimization procedures. The result is a method that fits seamlessly into the CAD workflow because it works on the same representation as the designer, enabling the alternation of manual editing and fabrication-aware optimization at will.","lang":"eng"}],"acknowledged_ssus":[{"_id":"M-Shop"}],"month":"05","alternative_title":["ISTA Thesis"],"language":[{"iso":"eng"}],"file":[{"access_level":"open_access","relation":"main_file","content_type":"application/pdf","file_id":"12942","checksum":"cc2094e92fa27000b70eb4bfb76d6b5a","embargo":"2023-12-07","creator":"chafner","date_updated":"2023-12-08T23:30:04Z","file_size":50714445,"date_created":"2023-05-11T10:43:20Z","file_name":"thesis-hafner-2023may11-a2b.pdf"},{"file_name":"thesis-release-form.pdf","date_created":"2023-05-11T10:43:44Z","file_size":265319,"date_updated":"2023-12-08T23:30:04Z","creator":"chafner","checksum":"a6b51334be2b81672357b1549afab40c","file_id":"12943","embargo_to":"open_access","content_type":"application/pdf","relation":"source_file","access_level":"closed"}],"publication_status":"published","degree_awarded":"PhD","publication_identifier":{"issn":["2663-337X"],"isbn":["978-3-99078-031-2"]},"ec_funded":1,"related_material":{"record":[{"relation":"part_of_dissertation","id":"9817","status":"public"},{"relation":"part_of_dissertation","id":"7117","status":"public"},{"id":"13188","status":"public","relation":"dissertation_contains"}]},"_id":"12897","status":"public","type":"dissertation","ddc":["516","004","518","531"],"date_updated":"2024-01-29T10:47:51Z","supervisor":[{"id":"49876194-F248-11E8-B48F-1D18A9856A87","first_name":"Bernd","last_name":"Bickel","orcid":"0000-0001-6511-9385","full_name":"Bickel, Bernd"}],"file_date_updated":"2023-12-08T23:30:04Z","department":[{"_id":"GradSch"},{"_id":"BeBi"}],"oa":1,"publisher":"Institute of Science and Technology Austria","day":"05","year":"2023","has_accepted_license":"1","date_created":"2023-05-05T10:40:14Z","doi":"10.15479/at:ista:12897","date_published":"2023-05-05T00:00:00Z","page":"180","project":[{"grant_number":"715767","name":"MATERIALIZABLE: Intelligent fabrication-oriented Computational Design and Modeling","call_identifier":"H2020","_id":"24F9549A-B435-11E9-9278-68D0E5697425"}],"user_id":"400429CC-F248-11E8-B48F-1D18A9856A87","citation":{"short":"C. Hafner, Inverse Shape Design with Parametric Representations: Kirchhoff Rods and Parametric Surface Models, Institute of Science and Technology Austria, 2023.","ieee":"C. Hafner, “Inverse shape design with parametric representations: Kirchhoff Rods and parametric surface models,” Institute of Science and Technology Austria, 2023.","apa":"Hafner, C. (2023). Inverse shape design with parametric representations: Kirchhoff Rods and parametric surface models. Institute of Science and Technology Austria. https://doi.org/10.15479/at:ista:12897","ama":"Hafner C. Inverse shape design with parametric representations: Kirchhoff Rods and parametric surface models. 2023. doi:10.15479/at:ista:12897","mla":"Hafner, Christian. Inverse Shape Design with Parametric Representations: Kirchhoff Rods and Parametric Surface Models. Institute of Science and Technology Austria, 2023, doi:10.15479/at:ista:12897.","ista":"Hafner C. 2023. Inverse shape design with parametric representations: Kirchhoff Rods and parametric surface models. Institute of Science and Technology Austria.","chicago":"Hafner, Christian. “Inverse Shape Design with Parametric Representations: Kirchhoff Rods and Parametric Surface Models.” Institute of Science and Technology Austria, 2023. https://doi.org/10.15479/at:ista:12897."},"title":"Inverse shape design with parametric representations: Kirchhoff Rods and parametric surface models","article_processing_charge":"No","author":[{"last_name":"Hafner","full_name":"Hafner, Christian","id":"400429CC-F248-11E8-B48F-1D18A9856A87","first_name":"Christian"}]},{"article_number":"171","project":[{"name":"MATERIALIZABLE: Intelligent fabrication-oriented Computational Design and Modeling","grant_number":"715767","call_identifier":"H2020","_id":"24F9549A-B435-11E9-9278-68D0E5697425"}],"user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","citation":{"short":"C. Hafner, B. Bickel, ACM Transactions on Graphics 42 (2023).","ieee":"C. Hafner and B. Bickel, “The design space of Kirchhoff rods,” ACM Transactions on Graphics, vol. 42, no. 5. Association for Computing Machinery, 2023.","ama":"Hafner C, Bickel B. The design space of Kirchhoff rods. ACM Transactions on Graphics. 2023;42(5). doi:10.1145/3606033","apa":"Hafner, C., & Bickel, B. (2023). The design space of Kirchhoff rods. ACM Transactions on Graphics. Association for Computing Machinery. https://doi.org/10.1145/3606033","mla":"Hafner, Christian, and Bernd Bickel. “The Design Space of Kirchhoff Rods.” ACM Transactions on Graphics, vol. 42, no. 5, 171, Association for Computing Machinery, 2023, doi:10.1145/3606033.","ista":"Hafner C, Bickel B. 2023. The design space of Kirchhoff rods. ACM Transactions on Graphics. 42(5), 171.","chicago":"Hafner, Christian, and Bernd Bickel. “The Design Space of Kirchhoff Rods.” ACM Transactions on Graphics. Association for Computing Machinery, 2023. https://doi.org/10.1145/3606033."},"title":"The design space of Kirchhoff rods","external_id":{"isi":["001086833300010"]},"article_processing_charge":"No","author":[{"last_name":"Hafner","full_name":"Hafner, Christian","first_name":"Christian","id":"400429CC-F248-11E8-B48F-1D18A9856A87"},{"id":"49876194-F248-11E8-B48F-1D18A9856A87","first_name":"Bernd","last_name":"Bickel","orcid":"0000-0001-6511-9385","full_name":"Bickel, Bernd"}],"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).","oa":1,"publisher":"Association for Computing Machinery","quality_controlled":"1","publication":"ACM Transactions on Graphics","day":"20","year":"2023","has_accepted_license":"1","isi":1,"date_created":"2023-07-04T07:41:30Z","date_published":"2023-09-20T00:00:00Z","doi":"10.1145/3606033","_id":"13188","keyword":["Computer Graphics","Computational Design","Computational Geometry","Shape Modeling"],"status":"public","type":"journal_article","article_type":"original","ddc":["516"],"date_updated":"2024-03-27T23:30:46Z","file_date_updated":"2023-07-04T08:11:28Z","department":[{"_id":"BeBi"}],"oa_version":"Submitted Version","abstract":[{"lang":"eng","text":"The Kirchhoff rod model describes the bending and twisting of slender elastic rods in three dimensions, and has been widely studied to enable the prediction of how a rod will deform, given its geometry and boundary conditions. In this work, we study a number of inverse problems with the goal of computing the geometry of a straight rod that will automatically deform to match a curved target shape after attaching its endpoints to a support structure. Our solution lets us finely control the static equilibrium state of a rod by varying the cross-sectional profiles along its length.\r\nWe also show that the set of physically realizable equilibrium states admits a concise geometric description in terms of linear line complexes, which leads to very efficient computational design algorithms. Implemented in an interactive software tool, they allow us to convert three-dimensional hand-drawn spline curves to elastic rods, and give feedback about the feasibility and practicality of a design in real time. We demonstrate the efficacy of our method by designing and manufacturing several physical prototypes with applications to interior design and soft robotics."}],"acknowledged_ssus":[{"_id":"M-Shop"}],"intvolume":" 42","month":"09","language":[{"iso":"eng"}],"file":[{"access_level":"open_access","relation":"main_file","content_type":"application/pdf","checksum":"4954c1cfa487725bc156dcfec872478a","file_id":"13194","success":1,"creator":"chafner","date_updated":"2023-07-04T08:11:28Z","file_size":19635168,"date_created":"2023-07-04T08:11:28Z","file_name":"kirchhoff-rods.pdf"},{"file_id":"13190","checksum":"79c9975fbc82ff71f1767331d2204cca","access_level":"open_access","relation":"supplementary_material","content_type":"application/pdf","title":"Supplemental Material with Proofs","date_created":"2023-07-04T07:46:28Z","file_name":"supp-main.pdf","creator":"chafner","date_updated":"2023-07-04T07:46:28Z","file_size":420909},{"checksum":"4ab647e4f03c711e1e6a5fc1eb8684db","file_id":"13191","content_type":"application/pdf","relation":"supplementary_material","access_level":"open_access","file_name":"supp-cheat.pdf","title":"Cheat Sheet for Notation","date_created":"2023-07-04T07:46:30Z","file_size":430086,"date_updated":"2023-07-04T07:46:30Z","creator":"chafner"},{"title":"Supplemental Video","date_created":"2023-07-04T07:46:39Z","file_name":"kirchhoff-video-final.mp4","date_updated":"2023-07-04T07:46:39Z","file_size":268088064,"creator":"chafner","checksum":"c0fd9a57d012046de90c185ffa904b76","file_id":"13192","content_type":"video/mp4","access_level":"open_access","relation":"supplementary_material"},{"checksum":"71b00712b489ada2cd9815910ee180a9","file_id":"13193","content_type":"application/x-zip-compressed","relation":"supplementary_material","access_level":"open_access","file_name":"matlab-submission.zip","date_created":"2023-07-04T07:47:10Z","title":"Matlab Source Code with Example","file_size":25790,"date_updated":"2023-07-04T07:47:10Z","creator":"chafner"}],"publication_status":"published","publication_identifier":{"eissn":["1557-7368"],"issn":["0730-0301"]},"ec_funded":1,"issue":"5","volume":42,"related_material":{"record":[{"status":"public","id":"12897","relation":"part_of_dissertation"}]}},{"project":[{"_id":"eb901961-77a9-11ec-83b8-f5c883a62027","name":"Perception-Aware Appearance Fabrication","grant_number":"M03319"}],"article_number":"35","title":"Gloss management for consistent reproduction of real and virtual objects","author":[{"full_name":"Chen, Bin","last_name":"Chen","first_name":"Bin"},{"last_name":"Piovarci","full_name":"Piovarci, Michael","first_name":"Michael","id":"62E473F4-5C99-11EA-A40E-AF823DDC885E"},{"first_name":"Chao","full_name":"Wang, Chao","last_name":"Wang"},{"first_name":"Hans-Peter","full_name":"Seidel, Hans-Peter","last_name":"Seidel"},{"first_name":"Piotr","last_name":"Didyk","full_name":"Didyk, Piotr"},{"last_name":"Myszkowski","full_name":"Myszkowski, Karol","first_name":"Karol"},{"first_name":"Ana","last_name":"Serrano","full_name":"Serrano, Ana"}],"article_processing_charge":"No","user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","citation":{"ama":"Chen B, Piovarci M, Wang C, et al. Gloss management for consistent reproduction of real and virtual objects. In: SIGGRAPH Asia 2022 Conference Papers. Vol 2022. Association for Computing Machinery; 2022. doi:10.1145/3550469.3555406","apa":"Chen, B., Piovarci, M., Wang, C., Seidel, H.-P., Didyk, P., Myszkowski, K., & Serrano, A. (2022). Gloss management for consistent reproduction of real and virtual objects. In SIGGRAPH Asia 2022 Conference Papers (Vol. 2022). Daegu, South Korea: Association for Computing Machinery. https://doi.org/10.1145/3550469.3555406","ieee":"B. Chen et al., “Gloss management for consistent reproduction of real and virtual objects,” in SIGGRAPH Asia 2022 Conference Papers, Daegu, South Korea, 2022, vol. 2022.","short":"B. Chen, M. Piovarci, C. Wang, H.-P. Seidel, P. Didyk, K. Myszkowski, A. Serrano, in:, SIGGRAPH Asia 2022 Conference Papers, Association for Computing Machinery, 2022.","mla":"Chen, Bin, et al. “Gloss Management for Consistent Reproduction of Real and Virtual Objects.” SIGGRAPH Asia 2022 Conference Papers, vol. 2022, 35, Association for Computing Machinery, 2022, doi:10.1145/3550469.3555406.","ista":"Chen B, Piovarci M, Wang C, Seidel H-P, Didyk P, Myszkowski K, Serrano A. 2022. Gloss management for consistent reproduction of real and virtual objects. SIGGRAPH Asia 2022 Conference Papers. SIGGRAPH: Computer Graphics and Interactive Techniques Conference vol. 2022, 35.","chicago":"Chen, Bin, Michael Piovarci, Chao Wang, Hans-Peter Seidel, Piotr Didyk, Karol Myszkowski, and Ana Serrano. “Gloss Management for Consistent Reproduction of Real and Virtual Objects.” In SIGGRAPH Asia 2022 Conference Papers, Vol. 2022. Association for Computing Machinery, 2022. https://doi.org/10.1145/3550469.3555406."},"publisher":"Association for Computing Machinery","quality_controlled":"1","oa":1,"acknowledgement":"This work is supported by FWF Lise Meitner (Grant M 3319), European Research Council (project CHAMELEON, Grant no. 682080), Swiss National Science Foundation (Grant no. 200502), and academic gifts from Meta.","date_published":"2022-11-01T00:00:00Z","doi":"10.1145/3550469.3555406","date_created":"2023-01-12T12:03:56Z","day":"01","publication":"SIGGRAPH Asia 2022 Conference Papers","has_accepted_license":"1","year":"2022","status":"public","type":"conference","conference":{"end_date":"2022-12-09","location":"Daegu, South Korea","start_date":"2022-12-06","name":"SIGGRAPH: Computer Graphics and Interactive Techniques Conference"},"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)"},"_id":"12135","file_date_updated":"2023-01-24T07:35:21Z","department":[{"_id":"BeBi"}],"ddc":["000"],"date_updated":"2023-02-13T09:15:25Z","month":"11","intvolume":" 2022","scopus_import":"1","oa_version":"Published Version","abstract":[{"text":"A good match of material appearance between real-world objects and their digital on-screen representations is critical for many applications such as fabrication, design, and e-commerce. However, faithful appearance reproduction is challenging, especially for complex phenomena, such as gloss. In most cases, the view-dependent nature of gloss and the range of luminance values required for reproducing glossy materials exceeds the current capabilities of display devices. As a result, appearance reproduction poses significant problems even with accurately rendered images. This paper studies the gap between the gloss perceived from real-world objects and their digital counterparts. Based on our psychophysical experiments on a wide range of 3D printed samples and their corresponding photographs, we derive insights on the influence of geometry, illumination, and the display’s brightness and measure the change in gloss appearance due to the display limitations. Our evaluation experiments demonstrate that using the prediction to correct material parameters in a rendering system improves the match of gloss appearance between real objects and their visualization on a display device.","lang":"eng"}],"volume":2022,"file":[{"access_level":"open_access","relation":"main_file","content_type":"application/pdf","checksum":"f47f3215ab8bb919e3546b3438c34c21","file_id":"12351","success":1,"creator":"dernst","date_updated":"2023-01-24T07:35:21Z","file_size":28826826,"date_created":"2023-01-24T07:35:21Z","file_name":"2022_ACM_SIGGRAPH_Chen.pdf"}],"language":[{"iso":"eng"}],"publication_identifier":{"isbn":["9781450394703"]},"publication_status":"published"},{"article_number":"112","project":[{"grant_number":"M03319","name":"Perception-Aware Appearance Fabrication","_id":"eb901961-77a9-11ec-83b8-f5c883a62027"},{"grant_number":"715767","name":"MATERIALIZABLE: Intelligent fabrication-oriented Computational Design and Modeling","_id":"24F9549A-B435-11E9-9278-68D0E5697425","call_identifier":"H2020"}],"citation":{"ista":"Piovarci M, Foshey M, Xu J, Erps T, Babaei V, Didyk P, Rusinkiewicz S, Matusik W, Bickel B. 2022. Closed-loop control of direct ink writing via reinforcement learning. ACM Transactions on Graphics. 41(4), 112.","chicago":"Piovarci, Michael, Michael Foshey, Jie Xu, Timothy Erps, Vahid Babaei, Piotr Didyk, Szymon Rusinkiewicz, Wojciech Matusik, and Bernd Bickel. “Closed-Loop Control of Direct Ink Writing via Reinforcement Learning.” ACM Transactions on Graphics. Association for Computing Machinery, 2022. https://doi.org/10.1145/3528223.3530144.","apa":"Piovarci, M., Foshey, M., Xu, J., Erps, T., Babaei, V., Didyk, P., … Bickel, B. (2022). Closed-loop control of direct ink writing via reinforcement learning. ACM Transactions on Graphics. Association for Computing Machinery. https://doi.org/10.1145/3528223.3530144","ama":"Piovarci M, Foshey M, Xu J, et al. Closed-loop control of direct ink writing via reinforcement learning. ACM Transactions on Graphics. 2022;41(4). doi:10.1145/3528223.3530144","ieee":"M. Piovarci et al., “Closed-loop control of direct ink writing via reinforcement learning,” ACM Transactions on Graphics, vol. 41, no. 4. Association for Computing Machinery, 2022.","short":"M. Piovarci, M. Foshey, J. Xu, T. Erps, V. Babaei, P. Didyk, S. Rusinkiewicz, W. Matusik, B. Bickel, ACM Transactions on Graphics 41 (2022).","mla":"Piovarci, Michael, et al. “Closed-Loop Control of Direct Ink Writing via Reinforcement Learning.” ACM Transactions on Graphics, vol. 41, no. 4, 112, Association for Computing Machinery, 2022, doi:10.1145/3528223.3530144."},"user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","external_id":{"arxiv":["2201.11819"]},"article_processing_charge":"No","author":[{"id":"62E473F4-5C99-11EA-A40E-AF823DDC885E","first_name":"Michael","full_name":"Piovarci, Michael","last_name":"Piovarci"},{"first_name":"Michael","full_name":"Foshey, Michael","last_name":"Foshey"},{"last_name":"Xu","full_name":"Xu, Jie","first_name":"Jie"},{"first_name":"Timothy","full_name":"Erps, Timothy","last_name":"Erps"},{"full_name":"Babaei, Vahid","last_name":"Babaei","first_name":"Vahid"},{"last_name":"Didyk","full_name":"Didyk, Piotr","first_name":"Piotr"},{"full_name":"Rusinkiewicz, Szymon","last_name":"Rusinkiewicz","first_name":"Szymon"},{"first_name":"Wojciech","full_name":"Matusik, Wojciech","last_name":"Matusik"},{"id":"49876194-F248-11E8-B48F-1D18A9856A87","first_name":"Bernd","last_name":"Bickel","orcid":"0000-0001-6511-9385","full_name":"Bickel, Bernd"}],"title":"Closed-loop control of direct ink writing via reinforcement learning","acknowledgement":"This work is graciously supported by the following grant agencies: FWF Lise Meitner (Grant M 3319), SNSF (Grant 200502), ERC Starting Grant (MATERIALIZABLE-715767), NSF (Grant IIS-181507).\r\n","oa":1,"publisher":"Association for Computing Machinery","quality_controlled":"1","year":"2022","has_accepted_license":"1","publication":"ACM Transactions on Graphics","day":"01","date_created":"2022-06-10T06:41:47Z","doi":"10.1145/3528223.3530144","date_published":"2022-06-01T00:00:00Z","_id":"11442","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)"},"type":"journal_article","article_type":"original","status":"public","date_updated":"2023-05-31T12:38:21Z","ddc":["000"],"department":[{"_id":"BeBi"}],"file_date_updated":"2022-06-28T08:32:58Z","abstract":[{"text":"Enabling additive manufacturing to employ a wide range of novel, functional materials can be a major boost to this technology. However, making such materials printable requires painstaking trial-and-error by an expert operator,\r\nas they typically tend to exhibit peculiar rheological or hysteresis properties. Even in the case of successfully finding the process parameters, there is no guarantee of print-to-print consistency due to material differences between batches. These challenges make closed-loop feedback an attractive option where the process parameters are adjusted on-the-fly. There are several challenges for designing an efficient controller: the deposition parameters are complex and highly coupled, artifacts occur after long time horizons, simulating the deposition is computationally costly, and learning on hardware is intractable. In this work, we demonstrate the feasibility of learning a closed-loop control policy for additive manufacturing using reinforcement learning. We show that approximate, but efficient, numerical simulation is\r\nsufficient as long as it allows learning the behavioral patterns of deposition that translate to real-world experiences. In combination with reinforcement learning, our model can be used to discover control policies that outperform\r\nbaseline controllers. Furthermore, the recovered policies have a minimal sim-to-real gap. We showcase this by applying our control policy in-vivo on a single-layer, direct ink writing printer. ","lang":"eng"}],"oa_version":"Submitted Version","intvolume":" 41","month":"06","publication_status":"published","publication_identifier":{"eissn":["1557-7368"],"issn":["0730-0301"]},"language":[{"iso":"eng"}],"file":[{"date_created":"2022-06-28T08:32:58Z","file_name":"2022_ACM_acceptedversion_Piovarci.pdf","creator":"dernst","date_updated":"2022-06-28T08:32:58Z","file_size":33994829,"checksum":"27f6fe41c6ff84d50445cc9b0176d45b","file_id":"11467","success":1,"access_level":"open_access","relation":"main_file","content_type":"application/pdf"}],"ec_funded":1,"related_material":{"link":[{"description":"News on ISTA website","relation":"press_release","url":"https://ista.ac.at/en/news/machine-learning-3d-printing-fluids/"}]},"issue":"4","volume":41}]