Interactively Rendering Dynamic Caustics on GPU

  • Baoquan Liu
  • Enhua Wu
  • Xuehui Liu
Conference paper
Part of the Lecture Notes in Computer Science book series (LNCS, volume 4035)


In this paper, a new technique is presented for interactive rendering of caustics fully processed on GPU. Without any pre-computation required, the algorithm can directly render refractive caustics from complex deformable transparent objects onto an opaque receiver surface. By the technique we accurately trace the path of the photons and calculate the energy carried by the photons emitted from the light source, and distribute the energy onto the receiver surface according to Gauss basis function. As a result, photorealistic caustic image is calculated without post-processing and temporal filtering over recent frames. We demonstrate that the interactive caustics can be rendered by our method in real-time for non-uniform deformation of both refractive object and receiver surface, and at the same time, interactive change of light and camera in terms of position and direction could be made.


Binary Search Depth Image Photon Mapping Transparent Object Gauss Basis Function 


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  1. 1.
    Jensen, H.W.: Global Illumination using Photon Maps. In: Rendering Techniques 1996, pp. 21–30. Springer, Heidelberg (1996)Google Scholar
  2. 2.
    Jensen, H.W.: Rendering Caustics on Non-Lambertian Surfaces. In: Proceedings of Graphics Interface 1996, pp. 116–121 (1996)Google Scholar
  3. 3.
    Guenther, J., Wald, I., Slusallek, P.: Realtime caustics using distributed photon mapping. In: Eurographics Symposium on Rendering, pp. 111–122 (2004)Google Scholar
  4. 4.
    Heckbert, P.S., Hanrahan, P.: Beam tracing polygonal objects. In: Proceedings of SIGGRAPH, pp. 119–127 (1984)Google Scholar
  5. 5.
    Watt, M.: Light-water interaction using backward beam tracing. In: Proceedings of SIGGRAPH, pp. 377–385 (1990)Google Scholar
  6. 6.
    Ernst, M., Akenine-Moller, T., Jensen, H.W.: Interactive rendering of caustics using interpolated warped volumes. In: Proceedings of Graphics Interface (2005)Google Scholar
  7. 7.
    Nishita, T., Nakamae, E.: Method of displaying optical effects within water using accumulation buffer. In: Proceedings of 21st annual conference on computer graphics and interactive techniques, New York, NY, USA, pp. 373–379 (1994)Google Scholar
  8. 8.
    Iwasaki, K., Yoshimoto, F., Dobashi, Y., Nishita, T.: A Fast Rendering Technique of Transparent Objects and Caustics. In: Proceedings of CASA, HongKong, pp. 165–170 (2005)Google Scholar
  9. 9.
    Shah, M., Pattanaik, S.: Caustics mapping: An image-space technique for real-time caustics. Tech. Rep. CS-TR-50-07, University of Central Florida (2005)Google Scholar
  10. 10.
    Wyman, C.: An approximate image-space approach for interactive refraction. In: SIGGRAPH 2005. ACM Transactions on Graphics, vol. 24(3), pp. 1050–1053 (July 2005)Google Scholar
  11. 11.
    Wyman, C., Davis, S.: Interactive Image-Space Techniques for Approximating Caustics. In: Proceedings of 2006 ACM Symposium on Interactive 3D Graphics and Games 2006, Redwood Shore, CA, USA, March 14-17 (to appear, 2006)Google Scholar
  12. 12.
    Szirmay-Kalos, L., Aszodi, B., Lazanyi, I., Premecz, M.: Approximate Ray-Tracing on the GPU with Distance Impostors. Proceeding of Eurographics2005 Computer graphics forum 24(3), Dublin, 171–176 (2005)Google Scholar
  13. 13.
    Stürzlinger, W., Bastos, R.: Interactive Rendering of Globally Illuminated Glossy Scenes. In: Dorsey, S. (ed.) Rendering Techniques 1997, pp. 93–102. Springer, Heidelberg (June 1997)Google Scholar

Copyright information

© Springer-Verlag Berlin Heidelberg 2006

Authors and Affiliations

  • Baoquan Liu
    • 1
    • 3
  • Enhua Wu
    • 1
    • 2
  • Xuehui Liu
    • 1
  1. 1.State Key Lab. of Computer Science, Institute of SoftwareChinese Academy of SciencesBeijing
  2. 2.Department of Computer and Information ScienceUniversity of MacauMacao
  3. 3.Graduate University of Chinese Academy of Sciences 

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