Real-time shading with filtered importance sampling

ABSTRACT

Correct perception of materials requires complex, natural illumination [Fleming et al. 2003]. Thus for material or lighting design applications, realistic, interactive rendering of objects with arbitrary materials under natural illumination is essential. We present a simple and efficient technique for real-time, image-based lighting of objects with spatially-varying, glossy materials. The key to our algorithm is combining BRDF-proportional importance sampling with environment map filtering to attain computationally efficient rendering amenable to the GPU.

REFERENCES

• 1: Fleming, R. W., Dror, R. O., and Adelson, E. H. 2003. Real-world illumination and the perception of surface reflectance properties. Journal of Vision 3 (July), 347--368.
• 2: Jan Kautz , Pere-Pau Vázquez , Wolfgang Heidrich , Hans-Peter Seidel, Unified Approach to Prefiltered Environment Maps, Proceedings of the Eurographics Workshop on Rendering Techniques 2000, p.185-196, June 26-28, 2000
• 3: Ravi Ramamoorthi , Pat Hanrahan, An efficient representation for irradiance environment maps, Proceedings of the 28th annual conference on Computer graphics and interactive techniques, p.497-500, August 2001 [doi>10.1145/383259.383317]