[Papervision3D] backface culling

[Terry Corbet]

Thank you for the DoubleSidedCompositeMaterial class.  I try to maintain a
regression test suite of essential functionality between the latest SVN code
from PV, Away and Sandy.  For several months, Sandy provided the most
complete handling of polygons with different appearances on each side --
including the necessary support for 'hit testing' since a mouse event might
be directed towards either 'side' -- and the handling of the different
effects of any scene lighting as the camera navigates around from one 'side'
to the 'opposite'.  

The second most complete support was found in the code from Away.  With PV,
I kept wondering when the 'opposite' property was going to turn into
something.  So, a quick test of your class seems to indicate good behavior
in the spirit in which CompositeMaterial was designed.  However, I had to
change the access to CompositeMaterial.materials from private to protected,
so that begs the question:  Have you asked PV to do that, or alternately, is
PV going to buy in to your implementation as what they intend for support of
two-sided polygon rendering?
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