You have two possibilties for the perspective view. If persp='on', the model is projectec
using a frustrum projection matrix. In the other case, it uses an ortho matrix (orthogonal projection).
The near and far clipping planes are given by the parameter clip. The
left, right, bottom and top clipping planes are given by the parameter size.
If cut is set to 'yes', particles outside the box defined by the 6 planes are not displayed.
Release 4.0, documentation updated on February 2008.
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