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Detail-Preserving Continuum Simulation of Straight Hair
Aleka McAdams, Andrew Selle, Kelly Ward, Eftychios Sifakis, Joseph Teran
Continuum-based hair simulation using SPH-like discretization preserving fine strand detail while handling large numbers of interacting hairs.
Abstract
This paper presents a hybrid Eulerian/Lagrangian approach for simulating straight hair that captures both bulk volumetric behavior and intricate strand-level detail. Bulk hair interaction and volume preservation are handled efficiently by a FLIP-based incompressible fluid solver operating on a grid, while fine hair-hair contact is resolved with high-resolution Lagrangian self-collisions on a mass/spring strand model. The volumetric solve acts as an effective preconditioner for the geometric self-collision step, allowing many thousands of directly colliding hairs to be simulated faster than fully Lagrangian collision handling alone. The method also supports user-controllable density targeting and a separation condition to control artificial sticking, and is demonstrated on examples including braids and a walking animated character with 10,000 simulated hairs.
How to read this
- Category
- Method: a hybrid hair simulation technique
- Contributions
- A hybrid Eulerian/Lagrangian approach for straight hair that captures both bulk volumetric behavior and strand-level detail
- A FLIP-based incompressible fluid solver on a grid for bulk interaction and volume preservation, with high-resolution Lagrangian self-collisions on a mass/spring strand model for fine contact
- Uses the volumetric solve as a preconditioner for the geometric self-collision step and adds user-controllable density targeting and a separation condition, demonstrated up to 10,000 hairs
- Context
- Builds on Selle et al.'s mass-spring hair model and borrows incompressible-fluid (FLIP) machinery to make dense hair-hair contact tractable.Builds on: A Mass Spring Model for Hair Simulation
- Correctness
- Demonstrated on braids and a walking character with 10,000 simulated hairs; the method is scoped to straight hair and treats bulk interaction as an incompressible continuum, so curly hair and the continuum approximation's limits are the caveats to keep in mind.
- Clarity
- Conceptually clear if you know fluid solvers and mass-spring strands; a first pass conveys the bulk-plus-detail split, a second pass for the FLIP solve and its use as a preconditioner.
- How to read it
- Read first for why splitting bulk (fluid grid) from detail (Lagrangian self-collision) scales to thousands of hairs; a careful second pass on the FLIP preconditioning is worth it if you implement dense hair contact.
Builds on
Related work
Keywords
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