Proceedings of the 29th annual conference on Computer graphics and interactive techniques
Fast approximations for global illumination on dynamic scenes
ACM SIGGRAPH 2006 Courses
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A new real-time shading model is presented that uses spherical cap intersections to approximate a surface's incident lighting from dynamic area light sources. This method uses precomputed visibility information for static meshes to compute illumination, with approximate shadows, from dynamic area light sources at run-time. Because this technique relies on precomputed visibility data, the mesh is assumed to be static at render-time (i.e. it is assumed that the precomputed visibility data remains valid at run-time). The ambient aperture shading model was developed with real-time terrain rendering in mind (see Figure 1 for an example) but it may be used for other applications where fast, approximate lighting from dynamic area light sources is desired.