FACE

THE BOX'S MAIN HELP:

This specifies which face of the triangle is used in 
rendering calculations.  Single faces can speed up the render.
There are three choices: just the front face,
only the back face,
or both faces.

OUT (output):

This specifies which face of the triangle is used in 
rendering calculations.  Single faces can speed up the render.
There are three choices: just the front face,
only the back face,
or both faces.

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