Advanced RenderMan: Creating CGI for Motion Pictures by Anthony A. Apodaca

By Anthony A. Apodaca

This can be pretty well the bible for someone who makes use of renderman day-by-day. no matter if you're not a programmer it is a nice reference for these issues the programmers speak about :)

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There are no good general-purpose techniques for predicting the exact BRDF of a material based on its chemical composition and manufacturing process, so tables of the BRDF for various materials are almost always created by careful examination of a sample of the material. It is often the case that at the microscopic level, the surface of a material is actually a complex composite of different types of materials mixed together or layered on top of each other, each of which has a different BRDF. For example, common plastic is a mixture of a pure-white transparent base material with tiny flecks of opaque paint particles suspended in it.

5 Noise In his 1985 Siggraph paper, Perlin developed the concept that is commonly known today as noise. , white noise, pink noise). But signal processing noises all share one important quality: they are intrinsically random. Perlin recognized that in computer graphics, we want functions that are repeatable, and thus pseudorandom. But even more, he discovered that we get more utility out of functions that are random at a selected scale but are predictable and even locally smooth if seen at a much finer resolution.

There are an infinite number of vectors that point in the same direction but have different lengths. 0. Such a vector is said to be normalized. This is often noted by printing the name of the vector with a bar above it, such as N. Note that by convention, direction vectors that have negative length are considered to be pointing in the opposite direction. Certain mathematical operations are considered to be "legal" on points and direction vectors. For example, it is legal to multiply a vector by a scalar.

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