Graphics Gems III (IBM Version)

VI 9

LINEAR RADIOSITY APPROXIMATION USING VERTEX-TO-VERTEX FORM FACTORS

Nelson L. Max and Michael J. Allison,     Lawrence Livermore National Laboratory, Livermore, California

Publisher Summary

Linear radiosity variation can be incorporated into both ray-tracing and hemicube methods. Ray-tracing methods for progressive radiosity shoot rays from a patch to a vertex and can use linearly interpolated radiosities at sample points on the patch to find the energy transported along each ray. This chapter presents the hemicube algorithm. In the finite element conceptual framework, the radiosity variation is approximated by a linear combination of basic functions or shape functions. All polygons are divided into triangles so that the vertex radiosities ...