8-Ball - black spots

V-Ray V-Ray for Rhino General
1

This will be useful for all…

Saad mentioned a problem with the V-Ray rendering that other renderers did not have in his post Chaos: Industry-leading design and visualization software . The cause of this problem is overlapping faces. See this image:

I exploded the model and removed 9 faces that were overlapping.

A quikc render from V-Ray for Rhino shows the problem goes away.

A 3dm scene with a new layer called overlap can be downloaded for your review.

Best Regards,

Corey

2

8-Ball - black spots

Mostly for me - overlapping surfaces render pretty strange. Couple of hours ago - tried to mesh a polysurface, but forgot, that Rhino won’t delete this polysurface. And I pressed render :lol:

P.S. Oh, I forgot - do I need to resize it ?

804×622 83.9 KB

3

8-Ball - black spots

Paul,

Is there an instance that you would want overlapping faces?

There is no need to mesh as far as V-Ray for Rhino is concerned. Why are you meshing in the first place? Is this part of your everyday workflow?

Best regards,

Corey

4

8-Ball - black spots

I think the answer is no. But situations, when I need meshing are also possible.

5

8-Ball - black spots

Thanks Corey! :smile:

/BlueShift

6

8-Ball - black spots

There are many cases with overlapping faces. In conceptual models with overlapping cubical shapes for example. But that’s what the secondary ray bias is for, yet in this build it doesn’t seem to work. Here you can find the exact same case as Paul posted and the solution:

7

8-Ball - black spots

BTW: there are also many cases that you don’t want to use the global mesh settings, I wish that Rhino had object or layer based meshing as an option.
Sometimes the global mesh is good except for a few objects. When rendering a few smaller objects in a larger room for example, you don’t want to use nurbs walls, but rather a minimum-setting mesh copy of it.