"Mike Williams" <nos### [at] econymdemoncouk> wrote in message
news:2sWFHEA$bS5$EwIK@econym.demon.co.uk...
> Wasn't it Another Micheal (Mike) Williams who wrote:
>
> >Now a question of my own. Smooth_triangles and 3 norms. Do other programs
> >use Norms at the vertex or is POVRay unique in this aspect. Lightwave
seems
> >to calculate based on a center norm. I have seen where Lightwave fails
and
> >POVRay triumphs because of this difference.
>
> I notice that the OBJ file format associates normals with vertices, so
> any program that uses OBJ files, or any format that's interconvertible
> with OBJ format, would have normals at the vertices.
>
> I don't see how centre normals could work. Surely the normals at the
> centres of the triangles of an icosahedron are exactly the same as the
> normals of a sphere based on the same triangles.

I was not sure how it would work either but I can tell you there is a
differance and that Lightwave shows the Norms as being in the center of the
Poly. If there a lot of long nerrow triangles lightwave will mess up the
smoothing. POVRay gets them perfect. I was only guessing at the idea that it
must be the difference in how each handles Norms.

>
> -- 
> Mike Williams
> (A different one)
It has always amazed me how many "Mike Williams" there are in the world.
Sure makes it hard to feel unique.

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