Target Shape Controlled Cloud Animation

  • Shengjun Liu
  • Xiaogang Jin
  • Charlie C. L. Wang
Conference paper
Part of the Lecture Notes in Computer Science book series (LNCS, volume 4035)


This paper proposes a geometry-based technique to control the target shape and the motion of clouds in computer animation so that the synthetic appearance of the clouds resembles a specified three-dimensional shape. The technology for automatically generating this special effect has been desired by the movie industry for many years. Our method is based on ellipsoid decomposition. Firstly, ellipsoids are employed to approximate a given mesh model which indicates the target shape of cloud animation. After that, the target object is represented in a blobby implicit surface using ellipsoidal blobs. Finally, two geometry-based schemes are introduced to generate the cloud animations with target shape controlled in two different ways: aggregated from several pieces of clouds or diffused from one piece of cloud.


Aggregation Scheme Target Shape Computer Animation Implicit Surface Polygonal Mesh 
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  1. 1.
    Blinn, J.F.: A generalization of algebraic surface drawing. ACM Transactions on Graphics 1(3), 235–256 (1982)CrossRefGoogle Scholar
  2. 2.
    Muraki, S.: Volumetric shape description of range data using blobby model. Computer Graphics 25(4), 227–235 (1991)CrossRefGoogle Scholar
  3. 3.
    Bittar, E., Tsingos, N., Gascuel, M.P.: Automatic reconstruction of unstructured 3D data: combining a medial axis and implicit surfaces. Computer Graphics Forum 14, 457–468 (1995)CrossRefGoogle Scholar
  4. 4.
    Jin, X.G., Liu, S.J., Wang, C.C.L., Feng, J.Q., Sun, H.Q.: Blob-based liquid morphing. Computer Animation and Virtual Worlds 16, 391–403 (2005)CrossRefGoogle Scholar
  5. 5.
    Kajiya, J.T., Herzen, B.P.V.: Ray tracing volume densities. Computer Graphics 18(3), 165–174 (1984)CrossRefGoogle Scholar
  6. 6.
    Treuille, A., McNamara, A., Popovic, Z., Stam, J.: Keyframe control of smoke simulations. ACM Transactions on Graphics 22(3), 716–723 (2003)CrossRefGoogle Scholar
  7. 7.
    Fattal, R., Lischinski, D.: Target-driven smoke animation. ACM Transactions on Graphics 23(3), 439–446 (2004)CrossRefGoogle Scholar
  8. 8.
    Shi, L., Yu, Y.Z.: Controllable smoke animation with guiding objects. ACM Transactions on Graphics 24(1), 1–25 (2005)MATHCrossRefMathSciNetGoogle Scholar
  9. 9.
    Ebert, D.S.: Volumetric modeling with implicit functions: a cloud is born. In: Visual Proc. of ACM SIGGRAPH 1997, p. 147 (1997)Google Scholar
  10. 10.
    Dobashi, Y., Nishita, T., Yamashita, H., Okita, T.: Using metaballs to modeling and animate clouds from satellite images. The Visual Computer 15(9), 471–482 (1998)CrossRefGoogle Scholar
  11. 11.
    Nishita, T., Dobashi, Y.: Modeling and rendering methods of clouds. In: Pacific Graphics 1999, pp. 218–219 (1999)Google Scholar
  12. 12.
    Schpok, J., Simons, J., Ebert, D.S., Hansen, C.: A real-time cloud modeling, rendering, and animation system. In: Symposium on Computer Animation 2003, pp. 160–166 (July 2003)Google Scholar
  13. 13.
    Bouthors, A., Neyret, F.: Modeling clouds shape. In: Eurograhics 2004 (short papers) (2004)Google Scholar
  14. 14.
    Dobashi, Y., Kaneda, K., Yamashita, H., Okita, T., Nishita, T.: A simple, efficient method for realistic animation of clouds. In: Proc. SIGGRAPH 2000, pp. 19–28 (2000)Google Scholar
  15. 15.
    Bischoff, S., Kobbelt, L.: Ellipsoid decomposition of 3D-models. In: Proc. 3DPVT 2002, pp. 480–488 (2002)Google Scholar
  16. 16.
    Garland, M., Heckbert, P.S.: Surface simplification using quadric error metrics. In: Proc. SIGGRAPH 1997, pp. 209–216 (1997)Google Scholar

Copyright information

© Springer-Verlag Berlin Heidelberg 2006

Authors and Affiliations

  • Shengjun Liu
    • 1
  • Xiaogang Jin
    • 1
  • Charlie C. L. Wang
    • 2
  1. 1.State Key Lab of CAD&CGZhejiang UniversityHangzhouP.R. China
  2. 2.Department of Automation and Computer-Aided EngineeringThe Chinese University of Hong Kong 

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