I followed a rhino tutorial and made a car with it. It was a SubD car then I turned it into Nurbs, applyed some default Vray materials and when I want to render some parts of the car is black and some are functioning in a normal way. Do you guys have any idea why this is happening? When I rotate the light source or the viewport nothing changes. I think it’s not because of the light source but the object parts.
You have a chrome material and a black environment, once the care reflects the outside it becomes fully black, and you don’t have any mid tone. Try using a shader like the car paint 2, or any other material with not that sharp reflections, and then add a coat layer to look polished. Changing the environment will also help, something with a gradient.