On 7 Jun 1999 10:24:20 -0400, Nieminen Mika wrote:
>  If the normal of one corner is pointing towards the light and the normal
>of another corner is pointing to the other direction, the shadow line
>is somewhere between these corners. This shadow line is not sharp, but
>smooth (just like in regular cylinders).

I think the triangle smoothing is only good up to a certain point.  If
the normal vectors of the corners diverge by too much, it might not work
as you'd expect.

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