If the same normal vector is supplied for all three vertices, POV-Ray
appears to completely ignore them, treats the triangle as a flat
triangle, and assigns the default normal.

I ran into this while testing my update of the Subdivision Surface
include; I'm expanding it to include quadrilateral faces, which I'm
implementing with a pair of triangles.  When the four points of a
quad face are not co-planar, I still want them to have a uniform normal
across the face so that the triangles don't show.  The behavior
mentioned above defeats this aim.

This appears to be an optimization that goes too far. I found a
work-around.

Regards,
John

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