Spatial Transformation
After a model is created, it exists in its original reference frame until it is somehow spatially transformed. Indeed, there isn't much point to go to all the trouble of geometric modeling unless the model can be moved or rotated. This is the domain of spatial transformation.
The definition of a transformation is a function that maps points from one space to another. There are two basic uses of transformation in 3D graphics.
The first use is to move, rotate, scale, and shear objects in three dimensions. The applications programmer will use transformations in this way time and time again.
The second use of transformation is less frequently encountered by the applications programmer but is present in every application. This ...
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