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Clean Cloth Inputs: Removing Character Self-Intersections with Volume Simulation
Applies volume simulation to character meshes before cloth simulation to eliminate self-intersections, used in production on Pixar's short Bao.
Abstract
Simulation artists frequently work with characters that self-intersect. When these characters are sent as inputs to a cloth simulator, the results can often contain terrible artifacts that must addressed by tediously sculpting either the input characters or the output cloth. In this talk, we apply volume simulation to character meshes and remove self-intersections before they are sent to the cloth simulator. The technique has successfully dealt with very challenging animation scenarios in a production setting, and was applied to all the characters on the short film, Bao.
How to read this
- Category
- Production talk: input cleanup for cloth simulation
- Contributions
- Applies volume simulation to character meshes to remove self-intersections before cloth simulation
- Reduces the tedious manual sculpting of input characters or output cloth caused by self-intersecting inputs
- Reports successful use on challenging animation on Pixar's short film Bao
- Context
- Builds on cloth-untangling ideas (Baraff et al., Untangling Cloth) but moves the intervention upstream, resolving intersections on the character input rather than on the simulated cloth.Builds on: Untangling Cloth
- Correctness
- Studio practice, not peer-reviewed; results are production-proven on a single short (Bao), so robustness claims are tied to the cases encountered there and depend on the volume sim resolving intersections without distorting the intended pose.
- Clarity
- Accessible short talk; a single read conveys the idea and where it sits in the pipeline.
- How to read it
- Read for the insight of cleaning the character input before the cloth solver; one pass suffices, with attention to how volume sim trades off intersection removal against shape fidelity.
Builds on
- Untangling Cloth 2003
Built upon by
Nothing yet.
Related work
- Dynamic Deformables: Implementation and Production Practicalities 2020 / SIGGRAPH Courses
- Nonlinear Cloth Simulation with Isogeometric Analysis 2024 / CASA
- Untangling Cloth 2003 / SIGGRAPH
- Fast Cloth Simulation on Moving Humanoids 2005 / Eurographics
Keywords
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