On 22 Jan 2002 12:14:13 -0500, Warp <war### [at] tagpovrayorg> wrote:

> It's not actually a heightfield bug. It's a more general phenomenon. If the
> angle between the normal vector returned by the object (any object) and the
> incoming ray is <90 degrees, then the normal vector is inverted.
> The normal vector of this smooth triangle points always upwards, never
> downwards, and thus it should never get colored red. But the inversion
> phenomenon of the normal causes the artifact.

I can be completly offtopic but could be normal determined by order of vertices
in triangle?

ABX

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