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Chris Wojtan, Nils Thuerey, Markus Gross, Greg Turk
We present a method for accurately tracking the moving surface
of deformable materials in a manner that gracefully handles topological
changes.We employ a Lagrangian surface tracking method, and we use a triangle
mesh for our surface representation so that fine features can be retained. We
make topological changes to the mesh by first identifying merging or splitting
events at a particular grid resolution, and then locally creating new pieces of
the mesh in the affected cells using a standard isosurface creation method.We
stitch the new, topologically simplified portion of the mesh to the rest of the
mesh at the cell boundaries. Our method detects and treats topological events
with an emphasis on the preservation of detailed features, while simultaneously
simplifying those portions of the material that are not visible.
Our surface
tracker is not tied to a particular method for simulating deformable materials.
In particular, we show results from two significantly different simulators: a
Lagrangian FEM simulator with tetrahedral elements, and an Eulerian grid-based
fluid simulator. Although our surface tracking method is generic, it is
particularly well-suited for simulations that exhibit fine surface details and
numerous topological events.
Highlights of our results include merging of
viscoplastic materials with complex geometry, a taffy-pulling animation with
many fold and merge events, and stretching and slicing of stiff plastic
material.
Two examples of visco-elastic fluid simulations:
Two examples of finite element simulations:
A comparison of our method with other surface tracking algorithms for one rotation
of the Zalesak disc:
Webpage: [WWW].
- C. Wojtan, N. Thuerey, M. Gross, G. Turk, Deforming Meshes that Split and Merge, Proceedings of ACM SIGGRAPH (New Orleans, USA, August 3-7, 2009), ACM Transactions on Graphics, vol. 28, no. 3, pp. 76:1-76:10
[Abstract]
[PDF] [Video]
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