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Foldover-free maps in 50 lines of code

Abstract : Mapping a triangulated surface to 2D space (or a tetrahedral mesh to 3D space) is the most fundamental problem in geometry processing. In computational physics, untangling plays an important role in mesh generation: it takes a mesh as an input, and moves the vertices to get rid of foldovers. In fact, mesh untangling can be considered as a special case of mapping where the geometry of the object is to be defined in the map space and the geometric domain is not explicit, supposing that each element is regular. In this paper, we propose a mapping method inspired by the untangling problem and compare its performance to the state of the art. The main advantage of our method is that the untangling aims at producing locally injective maps, which is the major challenge of mapping. In practice, our method produces locally injective maps in very difficult settings, and with less distortion than the previous work, both in 2D and 3D. We demonstrate it on a large reference database as well as on more difficult stress tests. For a better reproducibility, we publish the code in Python for a basic evaluation, and in C++ for more advanced applications.
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https://hal.archives-ouvertes.fr/hal-03127350
Contributor : François Protais Connect in order to contact the contributor
Submitted on : Monday, September 6, 2021 - 9:54:08 AM
Last modification on : Saturday, October 16, 2021 - 11:26:10 AM

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Vladimir Garanzha, Igor Kaporin, Liudmila Kudryavtseva, François Protais, Nicolas Ray, et al.. Foldover-free maps in 50 lines of code. ACM Transactions on Graphics, Association for Computing Machinery, 2021, Volume 40 (issue 4), Article No.102, pp 1-16. ⟨10.1145/3450626.3459847⟩. ⟨hal-03127350v2⟩

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