I was talking with Stephen about some scene elements,
and was wondering if there were a way to have directly lighted surfaces of an
object show one texture, and any unlighted / indirectly lighted surfaces have
another.

The obvious way would be to construct the object in 2 parts - split by a plane
the light source is perpendicular to, and assign each half a different texture.
Though I was hoping for something a bit more elegant, easier, and allowing a
smoother transition.

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