Sounds like artifacts one gets when normals for vertices point in bad
direction. 
I guess that utility that made your mesh-file screwed up some normals.

io175836 wrote:
> 
> Hiya everbody
> 
> I've created a complex smooth_triangle mesh with 90' corners in it. Wich
> worked perfectly fine exept for the fact that the mesh seems to darken
> at the edges of the mesh. I've tried every possible way of lighting it,
> but i can't seem to get rid of these patches.
> 
> Why does this happen and how can you eliminate it?
> 
> Maurits Dekker

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