Final radiosity gather step using a Monte Carlo technique with optimal importance sampling
Philippe Bekaert, Philip Dutré, Yves Willems · 1998
In this paper, an improved Monte Carlo based technique is presented to perform a per-pixel final gather step, also referred to as a local pass in radiosity computations. Using importance sampling based on the results from the finite-element radiosity computation, we achieve a very high image quality at a much lower cost compared to other common techniques. The theory in this paper examplifies how finite element and Monte Carlo techniques for rendering can be combined elegantly. Keywords : Global Illumination, Radiosity, Raytracing, Monte Carlo-techniques CR Subject Classification : I.3.7 1 Introduction First, we briefly present the main ideas behind radiosity methods, radiance reconstruction and Monte Carlo integration, introducing terminology. Some previous per-pixel reconstruction techniques are presented in x2. Our new improved technique will be outlined in section x3. Finally the results are discussed in x4. 1.1 Radiosity methods and radiance reconstruction Light transport in ...