What is the problem with rendering - 3ds max?

Question

3D

I render this model (I didn’t find a better flag model in this state) in 3ds max, change the material to the most ordinary, standard gray, and when rendering (with the vraytoon effect) it turns out like this:

Although all other objects are rendered correctly (seen in the background) . How to remove these black stains? I render with Vray, but without using the vray camera, because it turns out strange with it, the picture is all blurry and dark, I don’t know why ... :

Answer 1

Do you have a flag that is not made of double polyks?
The physical camera is dark and soapy, as it has aperture and shutter speed.