is the visibility of a Polygon[] exposed?

*To*: mathgroup at smc.vnet.net*Subject*: [mg83653] is the visibility of a Polygon[] exposed?*From*: congruentialuminaire at yahoo.com*Date*: Tue, 27 Nov 2007 06:15:17 -0500 (EST)

Hello Mathematica UG: Is it possible for my code to tell if a Polygon (in my graphics object) is visible? I assume that this is based upon (or is affected by) the ViewPoint-> setting. Further, I assume that the kernel is deriving this somewhere to do rendering. Do I have any access to this? If I evaluate: q = PolyhedronData["SnubCube"] I can see the component Polygon[] and GraphicsComplex[] objects that make up the Graphics3D[]. I want to make a code decision based on whether a face is showing. TIA. Regards..Roger W.