Hello everyone 
I’m a vray user for almost a year now and this never happened before..
I was working with the trial version, where everything worked perfectly and today i bought the full version,
then suddenly every object i duplicated (more specifically i made an instance via duplicate special) turned black
this happened to a new file, as well to an old file where all the colors were already showing correctly.
Has anyone encountered this problem before?
would love your help
Try inverting the normals.
I tried inverting normals, set to face, reversing the polygons… everything i could think of
can you share the scene?
Try freezing transforms
interesting.
If you turn on interactive render it does look fine and it’s not a poly issue it’s the vray material. It could be a bug.
I take it you want to continue manipulating to polys, so freezing is not an option.
I would simply flip it .merge verts and use the mirroring tools to edit further.
I can reproduce the same issue on a sphere in a new scene. if you apply default maya shader it works but applying vray material turns it black. Most odd
I’d report it as a bug and see what they say.
If you are done with editing polys then yes de-instance it then freeze polys.
Yes i’m still working on it so that was the reason.
Thank you so much for your advice and help, I will report it
The object has a negative Z scale, hence the blackness in the viewport (it renders just fine). So do what @stezza suggested: finish your modeling, de-instance, and freeze transformations.
