Abstract
Publisher Summary The radiosity method for diffuse environments expresses the energy transfer between a source patch and a receiving patch. Lying at the core of the radiosity formulation, the accurate computation of form factors plays an important role in determining the quality of the radiosity solution. This chapter presents a simple algorithm for the computation of accurate form factors. The algorithm computes the form factor between a finite-area polygonal source and a differential area on a receiving patch and can be used directly within the progressive refinement radiosity method. When partial occlusion occurs, approximating the visibility term with a constant function might result in a poor estimate of the form factor. The case of partial occlusion deserves more care. If the unoccluded analytical form factor falls within the ∈F tolerance, then the radiosity contribution cannot possibly be larger than the desired accuracy ∈B and is estimated by the product of the visibility factor V and the computed unoccluded form factor.
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