There is a major problem with you normals here.  The normals appear to be
somewhat inside out, but more importantly, they are not orthagonal to the
faces (considering they're supposed to be flat.  Pov interprets the surface
as curved according to the normals, and shades it as such, even though the
actual surfaces are flat.

Seeing as this is a flat object, the vertices at the corner of each triangle
would have to be identical and orthagonal to that triangle to be shaded
correctly.  But because it is a flat object, you don't need to specify
normals at all.  Try deleting or commentig out both the normal_vectors and
normal_indices sections.

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