> Thank you, but none of this makes a difference. The same thing can
> happen with every normal set to <0,0,-1> ( a flat triangle ). Take a
> look at my "high school math" post in p.b.i and you will see that there
> are shadows which aren't.

A normal of <0,0,-1>  is not flat in this instance, since the
triangle is at a different angle.  It's not enough that the
three normals be the same, they need to match the triangle too.

That said, even a flat triangle will show up dark at some angles,
it's supposed to be that way. The fact that you are using a bright
light increases the falloff of the shading so that many of the triangles
are saturated, and the shaded ones are dark by comparison.

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