(Probably an easy question, but I can't find the answer...)
Is there an easy way to determine which faces of my object are visible at
any one time?  I have an object made up of faces - I cull (back) so that I
don't have to draw faces I can't see - is there some way of knowing, at some
point in time, which faces are actually being drawn (forward faces) and
(/or) which are not?
Neil

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