Using Normals for backface-culling...

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It also worked with

If rnz#(i%, j%) > -0.21875 Then

That´s just about 12.5 degrees off, which is 56% of the precision I need (22.50 degrees or 1/16th of 360 degrees), so this should suffice.
If you can help me understand why this happens...
I do not even have to find a fix... just would like to know the reason why.
Thanks,

Rui Barbosa Jr.