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Abstract : |
Abstract. We present a method that makes the use of photon radiosity methods feasible for complex scenes when a totally 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. For the use of these specialised lightmaps, which consume comparatively small amounts of memory, no changes have to be made to the actual photon tracing algorithm. Also, they can be freely mixed with normal lightmaps and inserted at any point in the scene description graph. 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. 1, |
