Texture for volume character animation

ABSTRACT

We present an approach to texture mapping volume datasets based on multiple semantic constraints. The approach is based on continuous space mappings to ensure good image quality. It requires only one intervention by the user, to determine key points where the texture must match an intermediate image of the original data. This can also be used to avoid the problem of texture being smeared over too large an area. The method uses three passes. In the first pass the texture is warped to an intermediate surface which is itself a projection of the volume object. This is used to ensure that the texture correctly aligns with user-supplied key points of the object. The use of key points to pin the texture in place ensures that the volume object can be animated. When rendering the object two further passes are used, first inversely mapping each point being rendered to a plenoptic surface and then inversely mapping to the intermediate surface. This three-part aspect additionally allows the texture image to be independent of the volume data. A data-dependent triangulation method is used to retain edge quality in texture images. We demonstrate an extension to 2.5D textures, extruded through the volume, using an approach consistent with 2D texture. This supports interactive sculpting of the volume model. Our overall goal is animated characters using textured volume data.

REFERENCES

• 1: Allebach, J., and Wong, P. W. 1996. Edge directed interpolation. In Proc. IEEE Int. Conf. Image Processing, vol. 3, IEEE, 707--710.
• 2: Curtis Beeson , Kevin Bjorke, Skin in the "Dawn" demo, ACM SIGGRAPH Computer Graphics, v.38 n.2, p.14-19, May 2004 [doi>10.1145/1012283.1012284]
• 3: Bier, E., and Sloan, K. 1986. Two-part texture mapping. IEEE Computer Graphics and Application 6, 9 (Sept.), 40--53.
• 4: Nathan A. Carr , John C. Hart, Meshed atlases for real-time procedural solid texturing, ACM Transactions on Graphics (TOG), v.21 n.2, p.106-131, April 2002 [doi>10.1145/508357.508360]
• 5: Carr, N. A., Hart, H. C., and Maillot, J., 1999. The solid map: Methods for generating a 2-d texture map for solid texturing. Manuscript, http://graphics.cs.uiuc.edu/jch/papers/, eventually become "Meshed Atlases", Jan.
• 6: Chen, M., and Tucker, J. V. 2000. Constructive volume geometry. Computer Graphics Forum 19, 4, 281--293.
• 7: Chen, M., Islam, S., Jones, M., Shen, P. Y., Silver, D., Singh, V., Walton, S. J., and Willis, P., 2005. Deforming and animating discretly sampled object representation. Eurographics 2005, STAR Report, Dublin, Ireland, 113--140, (August).
• 8: Ferley, E., Cani, M.-P., and Gascuel, J.-D. 2000. Practical volumetric sculpting. The Visual Computer 16, 469--480.
• 9: Froumentin, M. E., and Willis, P. J. 1999. An efficient 2.5d rendering and compositing system. Computer Graphics Forum-Conference Issue 18, 3 (Sept.), C385-C394, C428.
• 10: Froumentin, M., Labrosse, F., and Willis, P. 2000. A vector-based representation for image warping. Computer Graphics Forum - Conference Issue 19, 3 (Sept.), C385-C394 and C428.
• 11: Nikhil Gagvani , Deborah Silver, Animating volumetric models, Graphical Models, v.63 n.6, p.443-458, November 2001 [doi>10.1006/gmod.2001.0557]
• 12: Ned Greene, Environment mapping and other applications of world projections, IEEE Computer Graphics and Applications, v.6 n.11, p.21-29, November 1986 [doi>10.1109/MCG.1986.276658]
• 13: Igor Guskov , Zoë J. Wood, Topological noise removal, No description on Graphics interface 2001, p.19-26, June 07-09, 2001, Ottawa, Ontario, Canada
• 14: Shoukat Islam , Swapnil Dipankar , Deborah Silver , Min Chen, Spatial and Temporal Splitting of Scalar Fields in Volume Graphics, Proceedings of the 2004 IEEE Symposium on Volume Visualization and Graphics (VV'04), p.87-94, October 11-12, 2004 [doi>10.1109/VV.2004.11]
• 15: Jones, M. W. 1999. Direct surface rendering of general and genetically bred implicit surfaces. In Proc. 17th Ann. Conf. of Eurographics (UK Chapter), IEEE, 37--46.
• 16: James T. Kajiya , Brian P Von Herzen, Ray tracing volume densities, ACM SIGGRAPH Computer Graphics, v.18 n.3, p.165-174, July 1984
• 17: Joe Kniss , Gordon Kindlmann , Charles Hansen, Interactive volume rendering using multi-dimensional transfer functions and direct manipulation widgets, Proceedings of the conference on Visualization '01, October 21-26, 2001, San Diego, California
• 18: Li, X., and Orchard, M. 2000. New edge directed interpolation. In Proc. IEEE Int. Conf. Image Processing, vol. 2, IEEE, 311--314.
• 19: Owada, S., Nielson, F., Okabe, M., and Igarashi, T. 2004. Volumetric illustration: Designing 3d models with internal textures. In Proceedings of SIGGRAPH 2004, ACM Press/ACM SIGGRAPH, Computer Graphics Proceedings, Annual Conference Series, ACM, 322--328.
• 20: Darwyn R. Peachey, Solid texturing of complex surfaces, Proceedings of the 12th annual conference on Computer graphics and interactive techniques, p.279-286, July 1985
• 21: Ken Perlin, An image synthesizer, Proceedings of the 12th annual conference on Computer graphics and interactive techniques, p.287-296, July 1985
• 22: Qi, M., and Willis, P. 2003. Quasi-3d cel-based animation. In Proc. of Vision, Video and Graphics 2003, Eurographics, 111--116.
• 23: Shen, P., and Willis, P. 2005. Texture mapping volume objects. In Int. Proc. of Vision, Video and Graphics, VVG2005, Eurographics Association, 45--52.
• 24: Dan Su , Philip Willis, Demosaicing of Colour Images Using Pixel Level Data-Dependent Triangulation, Proceedings of the Theory and Practice of Computer Graphics 2003, p.16, June 03-05, 2003
• 25: Su, D., and Willis, P. 2004. Image interpolation by pixel level data-dependent triangulation. Computer Graphics Forum 23, 2 (June), 189--201.
• 26: Tolga Tasdizen , Ross Whitaker , Paul Burchard , Stanley Osher, Geometric surface smoothing via anisotropic diffusion of normals, Proceedings of the conference on Visualization '02, October 27-November 01, 2002, Boston, Massachusetts
• 27: Fan-Yin Tzeng , Eric B. Lum , Kwan-Liu Ma, A Novel Interface for Higher-Dimensional Classification of Volume Data, Proceedings of the 14th IEEE Visualization 2003 (VIS'03), p.66, October 22-24, 2003 [doi>10.1109/VISUAL.2003.1250413]
• 28: Lujin Wang , Klaus Mueller, Generating Sub-Resolution Detail in Images and Volumes Using Constrained Texture Synthesis, Proceedings of the conference on Visualization '04, p.75-82, October 10-15, 2004 [doi>10.1109/VIS.2004.35]
• 29: Winter, A. S. 2002. Volume Graphics: Field-Based Modelling and Rendering. PhD thesis, University of Wales at Swansea.
• 30: Zoë Wood , Hugues Hoppe , Mathieu Desbrun , Peter Schröder, Removing excess topology from isosurfaces, ACM Transactions on Graphics (TOG), v.23 n.2, p.190-208, April 2004 [doi>10.1145/990002.990007]

INDEX TERMS

Primary Classification:
  I. Computing Methodologies
  I.3 COMPUTER GRAPHICS
      I.3.5 Computational Geometry and Object Modeling

Additional Classification:
  I. Computing Methodologies
  I.3 COMPUTER GRAPHICS
      I.3.7 Three-Dimensional Graphics and Realism

Keywords:
animation, morphing, solid texture, texture mapping, volume rendering, warping