DEPTH

THE BOX'S MAIN HELP:

This function returns the distance in z of point PP from the camera.
The results are normalized such that points on the near clipping 
plane are 0, and those on the far clipping plane are 1.
refer to page 330 in the RenderMan Companion.

PP (input):

A point in space.  The default is the surface point, P.

OUT (output):

This function returns the distance in z of point PP from the camera.
The results are normalize such that points on the near clipping 
plane are 0, and those on the far clipping plane are 1.
refer to page 330 in the RenderMan Companion.

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