Nieminen Mika wrote:

[ ... ]
>   You can see from the image, that two of the normals are pointing to one
> side of the triangle while the third is pointing to the other side. This may
> be causing the problem. I think that all the normals have to be pointing to
> the same side of the triangle.

I will have to experiment with this, but that particular triangle
came from a list of thousands where I am pretty sure that are other 
places where the normals reverse from one end of a triangle to another
(but maybe not! I have to check), and all but that one rendered nicely.

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