GPGPU Accelerated Texture-Based Radiosity

Sungkono Surya Tjahyono, Christof Lutteroth, Burkhard Wunsche
Department of Computer Science, University of Auckland, Auckland, New Zealand
26th International Conference Image and Vision Computing New Zealand (IVCNZ), 2011


   title={GPGPU Accelerated Texture-Based Radiosity},

   author={Tjahyono, Sungkono Surya and Lutteroth, Christof and Wunsche, Burkhard},

   booktitle={26th International Conference Image and Vision Computing New Zealand (IVCNZ)},



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Radiosity is a popular global illumination algorithm capable of achieving photorealistic rendering results. However, its use in interactive environments is limited by its computational complexity. This paper presents a GPGPU-based implementation of the gathering radiosity approach using texture-based discretisation and the OpenCL framework. Hemicubes are rendered to a texture array and processed by OpenCL kernels in parallel to compute the output radiance of the patches. Results show that even with the high synchronisation overhead of the OpenGL-OpenCL interoperability, the proposed method is an order of magnitude faster than a CPU-based implementation, and that it approaches interactive speeds. Investigation of the influence of different parameters shows that an increase in hemicube size results in a linear increase in computation time, while an increase in the number of layers in the texture array dimensions results in a logarithmic decrease in computation time.
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