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Levelsets in Production : Spider-Man 3 What are levelsets? • Implicit surface representation • SDF (signed distance function) in a regularly sampled grid. Daniel P. Ferreira | Sho Hasegawa Levelsets in Production : Spiderman 3 SIGGRAPH 2007 San Diego Sandstorm • Rich toolset • Includes levelset-based modeling and animation tools. – Geometry to Field – Field to Geometry – Field Attribute transfer / lookup – Snap to levelset – etc Daniel P. Ferreira | Sho Hasegawa Levelsets in Production : Spiderman 3 SIGGRAPH 2007 San Diego Benefits of Levelsets • Distance to the surface • Inside or Outside • Boolean operations • Surface modification (noise) • etc Daniel P. Ferreira | Sho Hasegawa Levelsets in Production : Spiderman 3 SIGGRAPH 2007 San Diego Examples : Combining two fields Daniel P. Ferreira | Sho Hasegawa Levelsets in Production : Spiderman 3 SIGGRAPH 2007 San Diego Examples : boolean union - max(A,B) intersection - min(A,B) Daniel P. Ferreira | Sho Hasegawa Levelsets in Production : Spiderman 3 SIGGRAPH 2007 San Diego Examples : boolean cut - max(A,-B) adding noise to the result Daniel P. Ferreira | Sho Hasegawa Levelsets in Production : Spiderman 3 SIGGRAPH 2007 San Diego Examples : Procedural noise variations Daniel P. Ferreira | Sho Hasegawa Levelsets in Production : Spiderman 3 SIGGRAPH 2007 San Diego 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 Daniel P. Ferreira | Sho Hasegawa Levelsets in Production : Spiderman 3 SIGGRAPH 2007 San Diego Case 1 :: Geometry Blending • Calculate the resultant levelset with: Daniel P. Ferreira | Sho Hasegawa Levelsets in Production : Spiderman 3 SIGGRAPH 2007 San Diego Daniel P. Ferreira | Sho Hasegawa Levelsets in Production : Spiderman 3 SIGGRAPH 2007 San Diego 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 Daniel P. Ferreira | Sho Hasegawa Levelsets in Production : Spiderman 3 SIGGRAPH 2007 San Diego Erosion - Examples Daniel P. Ferreira | Sho Hasegawa Levelsets in Production : Spiderman 3 SIGGRAPH 2007 San Diego 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. Daniel P. Ferreira | Sho Hasegawa Levelsets in Production : Spiderman 3 SIGGRAPH 2007 San Diego Daniel P. Ferreira | Sho Hasegawa Levelsets in Production : Spiderman 3 SIGGRAPH 2007 San Diego Erosion - Examples Daniel P. Ferreira | Sho Hasegawa Levelsets in Production : Spiderman 3 SIGGRAPH 2007 San Diego Daniel P. Ferreira | Sho Hasegawa Levelsets in Production : Spiderman 3 SIGGRAPH 2007 San Diego 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. Daniel P. Ferreira | Sho Hasegawa Levelsets in Production : Spiderman 3 SIGGRAPH 2007 San Diego Case 3 :: Particle trajectory correction Daniel P. Ferreira | Sho Hasegawa Levelsets in Production : Spiderman 3 SIGGRAPH 2007 San Diego Daniel P. Ferreira | Sho Hasegawa Levelsets in Production : Spiderman 3 SIGGRAPH 2007 San Diego Examples : Forming Shape Daniel P. Ferreira | Sho Hasegawa Levelsets in Production : Spiderman 3 SIGGRAPH 2007 San Diego Daniel P. Ferreira | Sho Hasegawa Levelsets in Production : Spiderman 3 SIGGRAPH 2007 San Diego Case 4 :: Levelset Collision Uses levelset for collision detection • Fast – Positive field(Φ>0) ⇔ Inside geometry • Robust – Closed & Non-intersecting – w/o multi sampling Daniel P. Ferreira | Sho Hasegawa Levelsets in Production : Spiderman 3 SIGGRAPH 2007 San Diego Daniel P. Ferreira | Sho Hasegawa Levelsets in Production : Spiderman 3 SIGGRAPH 2007 San Diego Daniel P. Ferreira | Sho Hasegawa Levelsets in Production : Spiderman 3 SIGGRAPH 2007 San Diego Daniel P. Ferreira | Sho Hasegawa Levelsets in Production : Spiderman 3 SIGGRAPH 2007 San Diego Case 5 :: Polygonization • Compute Normal and Curvature for Instancer tool Daniel P. Ferreira | Sho Hasegawa Levelsets in Production : Spiderman 3 SIGGRAPH 2007 San Diego Daniel P. Ferreira | Sho Hasegawa Levelsets in Production : Spiderman 3 SIGGRAPH 2007 San Diego Daniel P. Ferreira | Sho Hasegawa Levelsets in Production : Spiderman 3 SIGGRAPH 2007 San Diego Daniel P. Ferreira | Sho Hasegawa Levelsets in Production : Spiderman 3 SIGGRAPH 2007 San Diego Thank you! Daniel P. Ferreira | Sho Hasegawa Levelsets in Production : Spiderman 3 SIGGRAPH 2007 San Diego
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