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This page provides details on the Object ID extra attribute used in V-Ray.

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The ObjectID channel represents integer values that correspond to the specified object IDs to objects in your scene.

UI Path: ||Select mesh|| > Attribute Editor > Attributes menu > VRay > Object ID

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This group allows to assign an object ID to parts of the scene, for use with the Multimatte Render Element.

Object ID – Specifies an ID for the objects below the transform.

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Add to node:

vray addAttributesFromGroup "pSphereShape1" "vray_objectID" 1;

Attributes:

vrayObjectID