1. Texture for Volume Character Animation Peiyi Shen and Philip Willis
Graphite 2005
Texture for Volume Character Animation
Peiyi Shen and Philip Willis
Media Technology Research Centre
Department of Computer Science
University of Bath UK 1

2. Texture for Volume Character Animation Introduction
New challenges and applications in manipulating/animating/annotating volume datasets.
STAR-EG2005 : Deforming and Animating Discretely Sampled Object Representations, State of the Art Report, Eurographics ‘05, Dublin, Ireland.
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3. Texture for Volume Character Animation Introduction
Volume Datasets
- a collection of discrete samples
- no geometrical / topological /
semantic information
-> new challenges in deformation /
animation / annotation control
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4. Texture for Volume Character Animation Introduction
Mesh texturing is well-advanced
Problems of mesh models?
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5. Dawn: Curtis Beeson, Kevin Bjorke, Skin in the “Dawn” Demo, Computer Graphics, Vol. 38, No. 2, 2004, pp
Cubic map of environment; Diffuse colour map / bump map for the front of the head; Vertex shader techniques.
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6. Skin(BSSRDF): Henrik W. Jensen, Stephen R
Skin(BSSRDF): Henrik W. Jensen, Stephen R. Marschner, Marc Levoy and Pat Hanrahan, A Practical Model for Subsurface Light Transport, SIGGRAPH 2001.
Skin(Light-Diffusion): C. Donner, H. W.
Jensen, Light Diffusion in Multi –Layered
Translucent Materials, SIGGRAPH 2005.
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7. Spherical Matching: J. Starck, A
Spherical Matching: J. Starck, A. Hilton, Spherical Matching for Temporal Correspondence of Non-Rigid Surface, ICCV 2005.
Spherical parameterisation
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8. Mesh Models:
Filling Holes in Complex Surface using Volumetric Diffusion [Ref1]
An Out-of-core Algorithm for Isosurface Topology Simplification [Ref2]
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9. Volume Animation: STAR-EG2005
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10. Texture for Volume Character Animation Motivation
Our targets are:
1. To texture volume objects with realistic appearance.
2. To develop a method which is robust to topological artefacts
3. To use scalar-field based semantic constraints to assist texture mapping
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11. Texture for Volume Character Animation Functionality of our system
Plenoptic/cel texture +
projective indexing +
semantic control
scalar field based volume environments: VLIB
(Andrew S. Winter: PhD thesis, Chapter 6, 2002, University of Wales, Swansea)
Plenoptic projection plus semantic constraints: effectively a one-to-one parameterisation texture mapping.
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12. Texture for Volume Character Animation Texture Projection
Our system: the pipeline
(Left: after the style of Andrew S. Winter, with acknowledgements)
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13. Texture for Volume Character Animation Texture Projection
Our system:
Plenoptic/cel texture + projective indexing + …
cel
cylinder
sphere
box
Texture primitives (Intermediate Template) .
(Ox,Oy,Oz) . .
P(u,v)
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14. Texture for Volume Character Animation Constrained Rendering
Our system:
… + semantic constrained volume rendering.
(Ox,Oy,Oz)
P(u,v)
(Px,Py,Pz) .
P(x,y)
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15. Texture for Volume Character Animation Semantic Constraints
spatial
temporal
iso-surfaces etc
Applications:
annotation
illustration
and some more…
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16. Texture for Volume Character Animation Semantic Constraints
Intermediate template
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17. Texture for Volume Character Animation Semantic Constraints
Texture projective mapping
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18. Texture for Volume Character Animation Semantic Constraints
Volume visualisation
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19. Texture for Volume Character Animation Semantic Constraints
Example 1: Semantic constraint
Surface texture model: spherical
Internal texture model: procedural model
Semantic information: distance field
Volume rendering engine: DVR
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20. Texture for Volume Character Animation Texture Appliactions
Example 2: Multiple iso-surfaces
Volume rendering engine(DSR) will pick up multiple iso-surfaces.
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21. Example 3: Pseudo-solid texture
Texture for Volume Character Animation
Texture Applications
Example 3: Pseudo-solid texture
An effective one-to-one parameterisation texture mapping.
Figures (a) and (b): DVR
Figures(c) and (d): DSR
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22. Example 4: Semantic constraint (1)
Texture for Volume Character Animation
Texture Applications
Example 4: Semantic constraint (1)
spatial transfer / semantic layers / volumetric sculpturing
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23. Example 5: Semantic constraint (2)
Texture for Volume Character Animation
Texture Applications
Example 5: Semantic constraint (2)
CVG operations / scalar fields functions – splitting
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24. Example 6: Semantic constraint (3)
Texture for Volume Character Animation
Texture Applications
Example 6: Semantic constraint (3)
Enhanced volume rendering engine
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25. Example 7: Semantic constraints(4) Animation
Texture for Volume Character Animation
Texture Applications
Example 7: Semantic constraints(4) Animation
Enhanced volume rendering engine: Animation apps.
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26. Texture for Volume Character Animation Conclusions
System features:
Volume Rendering Control
2D/2.5D/3D texture models
Semantic constrained projective indexing: a practical “one-to-one” texture mapping model.
No mesh models, goes directly to volume datasets.
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27. Texture for Volume Character Animation Acknowledgements
UK EPSRC funding the project
Project partners:
University of Bath, UK
Professor Min Chen, Dr Mark Jones, University of Wales, Swansea, UK
Professor Deborah Silver The State University New Jersey, Rutgers, USA.
Special thanks to Dr Andrew S. Winter for supporting VLIB.
Ref: Volume Animation Forum
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28. Texture for Volume Character Animation Acknowledgements
Thank You
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29. Texture for Volume Character Animation Refs.
[Ref1] J. Davis, S.R. Marschner, M. Garr, M. Levoy, Filling Holes in Complex Surface using Volumetric Diffusion, Proc. 1st Int. Sym. On 3D Data Processing, Visualization, Transmission. Padua, Italy, June 19-21, 2002
[Ref2] Z. Wood, H. Hoppe, M. Desbrun, P. Schroder, An Out-of-core Algorithm for Isosurface Topology Simplification, ACM Tran. On Graphics, Vol.23, No.2, 2004, pp
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