Material ID Number

Material ID Number Render Element masks objects in the scene based on their shader Material ID Number value. The selection masks use automatic integer color assignment. The channel uses no anti-aliasing.

Opacity color and textures with values of 1 and 0 are supported by the Material ID Number channel.

This render channel is useful in a compositing process as a color mask for different materials in the scene.

From the Add Attribute button, add Material ID attribute. The new rollout contains ID Number and ID Color. After that, you can add the Material ID Number render element.