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The Two-Pass Radiosity Solution.
Several important variations on the basic diffuse radiosity solution
have been developed. The first is designed to relax the restriction on
the diffuse-only nature of the basic radiosity solution, by breaking the
intensity solution into two steps. First, a pass with a traditional
radiosity algorithm calculates the diffuse intensity of the surfaces,
followed by a pass with a ray tracing algorithm, which collects the
diffuse intensity information from the surfaces and adds to it specular
information. This second pass is viewpoint-dependent: specular
highlights on a surface are dependent on the location of both the light
and the viewer relative to the surface.