Vray Next4.20.02 rhino doesn't working on surface geometry

Vray Next4.20.02 rhino doesn’t working on on surface(in grasshopper )
When I use the surface geometry, the rendering result is incorrect

VRAY NEXT.gh (57.0 KB)
why ?

Hello and thank you for pointing this out!

At render time all geometry data is exported to V-Ray as meshes.
In your case the rendered faces are constructed using the surface control points instead of the curve control points.
I’ve passed along this forum thread to our dev team who will determine what can be improved.
In the meantime, as you’ve already figured out, please use a Mesh (as you’ve already figured it out) or Fragment Patch component instead of Boundary Surface.

Kind regards,
Peter Chaushev
V-Ray for Rhino QA Specialist

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thanks for reply and when i use shrinkuntrimSurface component the results is true and not problem

Hello, again,

After an investigation by our dev team, a conclusion was reached that this is a RhinoCommon API limitatoin (explained here: https://www.grasshopper3d.com/forum/topics/c-trimmed-surfaces-becomes)
In conclusion, another valid workaround would be to brep or meshbrep the geometry.

Kind regards,

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