It could be my second post for the same issue. I can not see my first post in the group so posting again (probable its a new google bug).
What could be the reason for black marks?
The ".pbrt" file and the rendered image are attached below. The geometry files are created using "0bj2pbrt" which contains normal and texture information along with the 3d model. Two black spots are rendered at two separate geometry (5_0
2.pbrt and 5_03.pbrt) that uses bump mapping.