Parts of the bumper is black

[Turkish20]

I'm having the issue, that the part shown below of the bumper is somehow black. The whole bumper is equipped to the paint:1 material yet I can't get rid of this black colour issue. Can anybody help me with it?

[alvinjohn]

I also got the same issue. Did you find any solution?

[Oleg]

most likely the inner polygons are attached to the same vertices as the outer polygons. ZModeler can't compute the direction the vertices normals should be point to and (probably) points normals to the sideway. You can fix the issue by selecting the outer polygons of the bumper and detaching them; then attach them back to make single object again. Then use Surface\Normals\Calcualte. This time inner polygons will not affect the outer polygons shading as they reside on different non-shared vertices points.