An efficient representation for irradiance environment maps
Proceedings of the 28th annual conference on Computer graphics and interactive techniques
Ray maps for global illumination
EGSR'05 Proceedings of the Sixteenth Eurographics conference on Rendering Techniques
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We present a method that makes the use of photon tracing methods feasible for complex scenes when a very accurate solution is not essential. This is accomplished by using orientation lightmaps, which average the illumination of complex objects depending on the surface normal. Through this averaging, they considerably reduce the variance of the stochastic solution. In order to use these specialized lightmaps, which consume comparatively small amounts of memory, no changes have to be made to the basic photon-tracing algorithm. In addition, they can be freely mixed with normal lightmaps. This gives the user good control over the amount of inaccuracy he introduces by their application. The area computations necessary for their insertion are performed using a stochastic sampling method that performs well for highly complex objects.