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Levelsets in Production : Spider-Man 3

Implicit surface representation using signed distance function in a regularly sampled grid. Includes levelset-based modeling, animation, and collision detection tools for various applications. Fast, robust, and efficient.

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Levelsets in Production : Spider-Man 3

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  1. Levelsets in Production : Spider-Man 3

  2. What are levelsets? • Implicit surface representation • SDF (signed distance function) in a regularly sampled grid.

  3. Sandstorm • Rich toolset • Includes levelset-based modeling and animation tools. • Geometry to Field • Field to Geometry • Field Attribute transfer / lookup • Snap to levelset • etc

  4. Benefits of Levelsets • Distance to the surface • Inside or Outside • Boolean operations • Surface modification (noise)‏ • etc

  5. Examples : Combining two fields

  6. Examples : boolean union - max(A,B)‏ intersection - min(A,B)‏

  7. Examples : boolean cut - max(A,-B)‏ adding noise to the result

  8. Examples : Procedural noise variations

  9. Case 1 :: Geometry Blending • Create two identical fields • Convert geometry into levelsets • detect the places where the two objects intersect in the field with a certain threshold

  10. Case 1 :: Geometry Blending • Calculate the resultant levelset with:

  11. Case 2 :: Erosion • Work in a still frame • Distribute particles uniformly in the geometry • Particles will store the erosion amount • Convert the geometry into a levelset • Modify the levelset (amount attibute + spatial noise)‏ • Apply the erosion to the moving geometry

  12. Erosion - Examples

  13. Case 2 :: Erosion • Primitives will be triggered when containing particles with a positive erosion value • Non-triggered primitives will generate the sand particles in render time.

  14. Erosion - Examples

  15. Case 3 :: Particle trajectory correction • Geometry Normal is stored in the levelset • Normal component is passed to the particle • Particle velocity vector is updated every frame using the levelset normal component to avoid penetrations.

  16. Case 3 :: Particle trajectory correction

  17. Examples : Forming Shape

  18. Case 4 :: Levelset Collision Uses levelset for collision detection • Fast • Positive field(Φ>0) ⇔ Inside geometry • Robust • Closed & Non-intersecting • w/o multi sampling

  19. Case 5 :: Polygonization • Compute Normal and Curvature for Instancer tool

  20. Thank you!

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