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So I have run into a problem recently after using VRay 5, I thought it might be a problem only I ran into but I had a friend of mine try it out and he also ran into the same problem. If I recall correctly I never had this issue back in 3.6(the last version I used). Basically, what happens is that when you use a vray material wrapper, the material doesn't seem to realize that a dome light is in the background and any meshes using the wrapper shows up as black. I've assigned a basic vray material to the base material slot, turned on shadows and affect alpha, set the alpha as -1 and most importantly checked the matte material option. This was really puzzling as I was going through youtube tutorials for the wrapper and none of em had any issues. After looking around on the internet, I found an old post somewhere else that mentions that a workaround would be to override the vray environment with the HDRI you used in the dome light. This works but isn't really a fix as you can run into other issues. Say you decided to rotate the dome light at a certain angle, but the overidden environment stays as it is and doesn't go along with the domelight's rotation, so you'll have a jarring plane on the ground looking completely different from the rest of the scenery. Anyone ran into this problem too? And if this is a universal issue with VRay 5, is chaosgroup planning to do something about it soon?
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This is the correct behavior since the matte shows the Background color that's set through the Environment overrides (even though not seen through a VRayDome light). If you wish to see the dome texture, set it in that slot as already mentioned (rotating isn't an issue since you're rotating the texture itself).
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