Introduction to Chinese Water Painting on 3D Surface

Transcription

1 Introduction to Chinese Water Painting on 3D Surface Cheng Peng School of Computer Engineering Supervisors: Miao Chunyan, Nadia Thalmann Jan

2 Motivation Outline 2D Chinese ink painting Commercial 3D painting Objective Real-time interactive 3D Chinese painting 3D Chinese painting animation Challenges and Potential Approach Brush geometry Painting flow simulation Painting on occluded area

3 Artists Work VS Computer Generated Chinese Painting QI Baishi 1891 & WU Guanzhong 1919 PhD & Secondary Student by Moxi 2005

4 Brush model [1] Simple data driven model [2] Detail preserving paint model [3] Physical based Chinese brush model Ink simulation [4] Free surface Lattice-Boltzmann mode [5] GPU implementation of Lattice-Boltzmann model [6] Water based paint flow Rendering [6] Resolution enhancement [6] Texture details 2D Ink Painting 1. BAXTER, W., AND GOVINDARAJU, N Simple data-driven modeling of brushes. In Proc. Symposium on Interactive 3D Graphics (I3D 2010). 2. CHU, N., BAXTER, W., WEI, L.-Y., AND GOVINDARAJU, N Detail-preserving paint modeling for 3D brushes. In Proc. Symposium on Non- Photorealistic Animation and Rendering (NPAR 2010). 3. CHU, S. H. AND TAI, C.-L An efficient brush model for physically-based 3D painting. In Proc. of Pacific Graphics, N. Thürey, C. K 鰎 ner, U. Rüde, Interactive Free Surface Fluids with the Lattice Boltzmann Method, Technical Report Technical Report, Department of Computer Science 10 System Simulation, J. Tölke, Implementation of a lattice Boltzmann kernel using the compute unified device architecture developed by nvidia, Computing and Visualization in Science, CHU. S. H, AND TAI. C.-L, Moxi: real-time ink dispersion in absorbent paper. ACM Trans. Graph. 24(3), (2005)

5 3D Chinese Painting Style Animation 3D Art Games Billboard XU Yi, Summer. short animation at SIGGRAPH 2003 Six Principles "Spirit Resonance "Bone Method "Correspondence to the Object "Division and Planning" Fascinating Animation We want 3D!

6 Existing painting systems Zbrush, 3D-Coat, Mudbox 3DS MAX, Photoshop CS 4, Maya, Blender Tedious texture editing Time-consuming Computer-like discrete painting Deep Paint 3D / Deep UV

7 Modeling and Animating 3D Chinese ink Painting Interactive Brush Brush Model Paint Flow Simulation Cost: Minutes-Hours Chinese Ink Style Model Imagebased XU Beihong ( ) Rendering

8 Related Work [7] intouch Haptic Painting Modeling, painting, force feedback No real object; purely virtual [8] Cave Painting Physical interface objects Display is purely virtual [9] WYSIWYG NPR Directly annotate Multi-viewpoints Adaptive artists original work 7. Arthur Gregory, Stephen Ehmann and Ming C. Lin, intouch : Interactive Multiresolution Modeling and 3D Painting with a Haptic Interface, Virtual Reality (VR 99). 8. Daniel F. Keefe, Daniel A. Feliz, Tomer Moscovitch, David Laidlaw and Joseph LaViola, Jr., CavePainting : a Fully Immersive 3D Artistic Medium and Interactive Experience, I3D Kalnins, R. D. etc WYSIWYG NPR: Drawing strokes directly on 3D models. In SIGGRAPH 2002,

9 Novelty What we have? What we want? Mouse (x, y) Tablet (x, y, p, d) Haptic device (x, y, f, p) Camera Organicity Spontaneity Development Physicality Computer Graphics Creative painting

10 Challenge1: Brush Geometry 2D Case Brush skeleton spine + lateral nodes Footprint swept surface Brush Dynamics energy minimization 3D Case Brush skeleton Footprint Stroke fall point, direction and length Lateral points moving on surface tangent space Geodesics Brush Dynamics External frictional energy Straightest geodesics [4] Free surface LB model

11 Challenge 2: Painting Flow Incompressible Lattice-Boltzmann model Simulation 1.Semi-permeability 2. Modulated advection 3. Boundary roughening 4.Uneven evaporation To 3D [10] Base trace--straightest Geodesics Local Lattice-Boltzmann [11] Surface tension field Simulated Ink [6] 10. Lee, H., Kim, L., Meyer, M., and Desbrun, M Meshes on fire. In EuroGraphics 2000 Workshop on Animation. 11. Xiuqing Xing, David Lee Butler,, and Chun Yang. A lattice Boltzmann based single-phase method for modeling surface tension and wetting. Computational Materials Science Volume 39, Issue 4, April 2007, Pages

12 Challenge 3: Painting on Occluded Area Screen Space Object Space Parameter Space Tangent space [12] Trefoil knot peeling and segmentation : Layerpaint Depth Peeling Segmentation Interactive Pop-up 12. FU, C.-W., XIA, J., AND HE, Y Layerpaint: a multi-layer interactive 3D painting interface. In CHI 10: Proceedings of the 28th international conference on human factors in computing systems, ACM, New York, NY, USA,

13 Schedule of work Implement 2D Chinese ink simulation Construct solutions for challenge 1&2 Implement and refine Read and write

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