Hello!
I reported some months ago that the V-Ray Volume Toon wasn’t working properly with Curves. It looks like the curves have duplicated mesh overlapping.
For some reason my request (466533) does not exist anymore, don’t know why.
This bug is now propagated to the V-Ray Outlines node.
*EDIT: this happens both using the Curve properties to give it shape and using the Curve to Tube modifier.
I’m using Blender 5.0.1 and V-Ray 7.30.20.