Résumé: In this paper we deal with the Monte Carlo radiosity problem of how to aim more rays towards where they are needed more: small patches and high- re .ectivity regions. We derive the optimal ray shooting probabilities when taking the mean- square- error as the error measure. The standard case of usingthe form factors is shown to be optimal in the particular case of equal relation between re .ectivity and square root of patch area throughout the scene. We also present an adaptive algorithm to compute optimal probabilities. Examples showing optimal direct illumination distribution are given, exhibiting concordance with the theoretically predicted results.

Langue: Anglais