By Anthony A. Apodaca
This is often pretty well the bible for somebody who makes use of renderman day-by-day. whether you're not a programmer it is a nice reference for these issues the programmers speak about :)
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Additional info for Advanced RenderMan: Creating CGI for Motion Pictures
First, our samples can be nondiscrete. That is, they can represent not the specific colors at particular points in the scene, but instead some average color over a region of the scene. Supersampling, where each pixel is a weighted average of many samples that are close together, and area sampling, where each pixel is the weighted average of the regions of color in some area covered by that pixel, are both techniques that can be used to reduce aliasing. 4 Computer Graphics 39 signal that is adequately sampled (top) and a signal that is inadequately sampled, which therefore aliases (bottom).
Because the opposite and adjacent sides have a right angle between them, they are perpendicular to each other. The sine function is defined as the ratio of the length of the opposite side to the length of the hypotenuse. The cosine function is the ratio of the length of the adjacent side to the length of the hypotenuse. 1 A simple right triangle and another triangle with three unremarkable angles. the length of the opposite side to the length of the adjacent side. Three easy to remember equations: Of course, if we know the lengths of the sides, or even just the ratio of the lengths of any two of the sides, we can compute the angle by using one of the inverse functions, arcsine, arccosine, or arctangent, which are generally abbreviated asin, acos, and atan.
This process, where the color is determined by the remaining light after certain portions of the spectrum have been removed, is called subtractive color. The filtering of transmitted light is another example of a subtractive process. The color of a filter, such as a piece of stained glass, is primarily based on the spectrum that remains after the light that is passing through has mostly been absorbed by the filter. A "red" filter is one that absorbs most of everything except red. The complementary process, where the color is determined by adding together light emitted from various colored light sources, is called additive color.