MultiMatte ignores .VRSCENE proxies

V-Ray V-Ray for Rhino Issues
1
  • Insert a .VRSCENE proxy into a Rhino scene
  • Assign a nonzero object ID to the VRSCENE
  • Activate the MultiMatte render element
  • Render

Result: No matte generated for the .VRSCENE geometry

Since .VRSCENE otherwise seems to be the best way to bring 3D plants into Rhino for renders, this is a significant hindrance.

2

Hello,

This is a known limitation of the MM render channel implementation in V-Ray for Rhino and SketchUp. Our developers will review how it can be improved for the next major release.
In the meantime, there is a workaround which requires some manual work:

1. Take a note of the Object ID numbers assigned in the .vrscene file prior to exporting it.

2. Import it as a proxy within Rhino. In this example, I’ve exported a simple scene from V-Ray for 3ds max containing 4 boxes with Object IDs 1, 2, 10, and 14:

step_02.jpg
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3. Create a Point for each Object ID in the .vrscene file. Assign the Object ID numbers to each point respectively:
step_03.jpg
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4. Add the MultiMatte render element and you’re ready to go.

step_04.jpg
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If you cannot remember which IDs have been used in the .vrscene, open it with a text editor and look for each node’s objectID parameter.
step_05.jpg

On a side node, the same workaround can be applied in V-Ray for SketchUp by creating dummy components with assigned ObjectIDs and removing their instances from the viewport prior to rendering.

Kind regards,
Peter