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Intuitive Sculpting System with Self-Adaptive Meshes: Freestyle Approach

Freestyle aims to develop an intuitive sculpting system for artists and users, vital in 3D content creation for movies and games. The system supports topological changes and provides efficient handling of geometry adjustments. This method interacts with quasi-uniform meshes, time evolution, and sculpting tools to achieve realistic sculpting that mimics physical properties. The system allows for easy surface deformation tracking and collision detection, ensuring a simplified workflow for both professional and amateur users.

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Intuitive Sculpting System with Self-Adaptive Meshes: Freestyle Approach

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  1. sculpting meshes with self-adaptive topology Freestyle Lucian Stanculescua,b , RaphaëlleChainea , Marie-PauleCanib,c a LIRIS, University of Lyon, France bLJK, Universityof Grenoble, France c INRIA, France Freestyle

  2. Introduction • Quasi-uniform mesh • Time evolution • Sculpting tools • Results • Conclusion and future work • Demo Contents Freestyle

  3. Goal : Develop an intuitive sculpting system • professional artists and amateur users • Digital sculpting : important tool for 3D content creation • animated movies, special effects, computer games • Models behind professional applications : • polygonal (no changes in topological genus) • ZBrush, Mudbox, Sculptris, Blender • regular grids (surface extraction, no color) • 3D Coat • Specific workflow • limitations 1. Introduction Freestyle

  4. Grid-based methods (Galyean and Hughes ‘91) • Deformation tools (Ferley et al. ‘01), virtual clay (Dewaele et al. ‘04) • Surface extraction • Implicit methods : Blob Tree • Deformations by Warp Curves (Sugihara et al. ‘10) • Hierarchy of tools • Particlesystems (Pons and Boissonnat ‘07, Debard et al. ‘07) • topology changes, quality adaptive mesh – relaxation process slow • Mesh-based • Model-based deformations : Laplacian editing (Sorkine et al. ‘04) • Space deformations (Angelidis et al. ‘04, von Funck et al. ‘06) • No change in topology 1. Introduction :: related work Freestyle

  5. Enable topological changes in mesh models • Interactive • Why meshes ? • No relaxationand complex reconstruction • Large variety of tools • Fast rendering on GPU 1. Introduction :: objective Freestyle

  6. Main idea : manifold mesh with uniform sampling • Advantages : • Simplify collision detection • Easily handle changes in topology • Simple tracking of surface deformations 2. Quasi-uniform mesh Freestyle

  7. D1. Δ tight mesh – closed manifold mesh M with edges < Δ • Constructed by splitting edges > Δ • Advantage: vertices reflect geometry (precision Δ: detail) • edge split 2. Quasi-uniform mesh :: detail Freestyle

  8. D2. Compliance with d • iterate over all edges • collapse if edge < d • ! Favored for most edges but not guaranteed • edge collapse 2. Quasi-uniform mesh :: mesh quality Freestyle

  9. D3. Quasi-uniform mesh • d < Δ,closed manifold mesh M • compliance with d • restoration of Δ tightness. • d < Δ / 2 • d: better uniformity, increase in vertex creation-deletion events 2. Quasi-uniform mesh Freestyle

  10. Vertices displaced by deformation fields • Apply compliance with d • Restore Δtightness • Handle topology • Difficulty • Detect important events before : • Loss in detail • Self-intersection 3. Time evolution Freestyle

  11. D4. Θ : minimum thickness supported by quasi-uniform mesh Θ : minimum distance between two non-adjacent vertices. Simple collisions : vertex-vertex connecting 1-rings 3. Time evolution Freestyle

  12. D5. μ : maximum allowed displacement for a vertex. 4 μ ² ≤ Θ² - Δ² / 3 3. Time evolution Freestyle

  13. Difficulty : maintain manifold mesh • Neighbourhood cleanup • Handle degenerate cases • Delete coinciding triangles (a) • Split surface at coinciding vertices and edges (a, b) • a) b) 3. Time evolution Freestyle

  14. Displacement fields • Space deformations • volume preserving • Model dependent • normals, geodesic distance… • Deformation applied discretely • Large displacements • divided • max(norm) < μ 4. Sculpting tools Freestyle

  15. 4. Sculpting tools :: space Sweep deform (volume preserving) Freestyle

  16. 4. Sculpting tools :: model Inflate (normals) Freestyle

  17. 5. Results • Object : 30k points • Collision detection – most time expensive • GPU implementation (x 30 speed-up, Le Grand, GPU Gems 3) • Interactive ~200k points • no optimization (VBO regions, GPU collision) Freestyle

  18. 6. Conclusions • Handle arbitrary changes in topology • simple quasi-uniform framework • Intuitive model based on two physical properties of materials • surface detail and bulk thickness • Closer to real-life sculpting • auto-refinement • changes in topology Freestyle

  19. 6. Future work • Sharp features • Sculpting curves • Fast approximate Boolean operations • Surface painting • Adaptive sampling (local quasi-uniform meshes) • Further validation by professional and amateur users Freestyle

  20. 7. Demo Freestyle

  21. Thank you ! Freestyle

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