To be honest, without seeing the scene code, it's going to be a hard problem to
diagnose.

Suggestions:

1. post a simple scene, perhaps a link to the mesh file.

2. Try a simple placeholder for your mesh like a union of boxes or something,
and see if the problem persists.

3.  Move things around a bit and see what happens.  translate, rotate in all 3
directions by a degree or so.  Make sure nothing's occluding your light onto
your object or getting between camera and object.  Check your finishes - hard
shadows will make everything BLACK and you just won't see that part of your
object.

Try non-zero values in your pigment statements.  (rgb < (val>0), (val>0),
(val>0) >

Add a small amount of diffuse to your finish.

Use radiosity in your scene.

Posting the scene would be best.

- BE

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