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11.2.2 Dual-Paraboloid Environment Mapping

Another environment map parameterization proposed by Heidrich and Seidel [54] avoids many of the disadvantages of and objectionable artifacts caused by sphere mapping. The dual-paraboloid environment mapping approach is view independent, has better sampling characteristics, and, because the singularity at the edge of the sphere map is eliminated, there are no sparkling artifacts at glancing edges.

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... Figure \thefigure . Two Paraboliods Shown in 2D as Parabolas}\\