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In Maya, Object IDs can be added as an Extra V-Ray Attribute. Two or more objects in the scene can share the same Object ID.

The Object ID Render Element creates selection masks based on Object ID that shows each object (by Object ID) in a solid unshaded color.

 

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To use render elements, select from the Available render elements column and click the Add button to add the passes you wish to generate at render time. When you render the scene, the added render elements listed in the column on the right, will also render, which can be viewed from the VFB window's channel drop-down menu.

For more information on the parameters on this dialog, see the Render Elements tab page.

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Original beauty render

 

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Glow and brightening added to the composite using matte created from
Object ID Render Element red channel (as a mask in composite)

 

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  • Select the geometry that an Object ID Render Element is needed for.

 

  • Add

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  • the Object ID

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  •  attribute Attributes > VRay > Object ID

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  •  while the shape node is active for the geometry.

 

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  • Set

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  • the Object ID to the required value. Note: each number corresponds to a different color.

 

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  • Open Render Settings

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  •  and go to

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  • the Render Elements

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  •  tab and from

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  • the Available render elements

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  •  add an Object ID

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  •  render element.

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The name of the Object ID render element must consist of the name of the Object ID itself, a dot and then any other string to be properly read in Nuke. For example, VRayObjectID.example . Do not include numbers in the name.