Demonstrates improved surface shading using normal distribution mapping, suggesting innovative texture representation techniques.
Normal distribution mapping is an extension of traditional texture mapping methods to normal and shading information. The surface normal direction and shading for a patch of surface are represented by a statistical distribution of normal directions. The normal distribution map is a map of these distributions as they vary over the surface. Normal distribution mapping admits considerable freedom in the choice of probability density function. We propose using a distribution based on a 3D Gaussian for this purpose. This distribution can be easily filtered for map antialiasing and cheaply evaluated for surface shading.
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Olano et al. (1997) studied this question.
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