5
Transformations
This chapter presents commands to locate (position, orient and scale) entities such as models, lights and cameras in space which help create useful scenes for rendering.
5.1 Coordinate Systems
A coordinate system, also known as a reference frame or coordinate space or simply space, is a central concept in computer graphics. Conceptually it provides a measurement system consisting of an origin, some reference directions (X, Y and Z axes in three-dimensional space) and uniformly-spaced tick marks along these directions with respect to which elements can be constructed. Elements created with reference to a certain coordinate system coexist in the space laid out by that system. Points in this space can be assigned values (e.g. x,y,z ...
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