That would not be difficult at all, in fact, I was about to make an
"interior_texture" patch when this message came up. :-)
I have already done something similar for a reflection patch I did, to
make one-way mirrors, but this method will be much more versatile. My
patch was limited to specifying the reflection for the interior side of
the surface.
Oh, before you ask-this patch should work for triangles, beziers, etc,
because although they don't have an interior, they are two-sided shapes.

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