Expecting this to be super helpful.  Maybe some of those will rectify the
visible tiling.

Still perplexed about why normal vector values would cause POV-Ray to report
degenerate triangles.

Just for reference:
#ifdef () doesn't preempt negative subscript or subscript out of range errors.

One should likely protect code with index < 0 or index > dimension_size-1
checks.


Thanks, Tor.

-BW

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