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

By Anthony A. Apodaca

This can be pretty well the bible for a person 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 discuss :)

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Notice that a smaller lens would have a narrower light cone, and all circles of confusion would be smaller. The interesting feature of the circle of confusion is that if it is smaller than a certain size-say, smaller than the resolving power of the film or of our eyes-we can't really notice it, and the object appears to still be in focus. For this reason, even though there is only one unique distance that the lens focuses exactly, there is a range of distances for which objects are only so slightly out of focus that the circle of confusion is not objectionable.

Vectors can be added together by adding the corresponding coordinates. We can visualize this as chaining the vectors together, the end of one attached to the start of the next. 3). Subtracting vectors is also legal; it is just like adding the negated vector. A vector can also be added to a point, again by adding the matching coordinates, which creates a new point that is displaced from the first by the distance and direction of the vector. It is not generally considered "legal" to add two points, because there is no geometrically logical result.

Scaling by a negative value on one (or three) axes does this, as does exchanging any two axes. Now we can answer the most probing question in all of human history. Why do mirrors reflect left-right, but not top-bottom? You can turn sideways, spin the mirror, stand on your head, but it always does it. Is this because we have two eyes that are next to each other left-right? (No,obviously not, because it happens even if one eye is closed . . ) Does it have something to do with the way our brains are wired, because we stand vertically, so our eyes are immune to top-bottom swaps?

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