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Render Layers - Material Override vs Shader Override

Message 1 of 3
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Render Layers - Material Override vs Shader Override

I am learning how to use Render Layers in Maya 2022 and have come across the Shader override and the Material override. If I read correctly, the Material is simply the node that contains all the descriptive info/shader network/files that is applied to the geo in the scene. The shader is built into the material and describes the pbr/exclusive attributes contained within the the selected material. However, if you want to say, create and AO render layer - I see in tutorials ( such as in 3:55) you would apply a shader override vs a material override. I'm a bit confused then - I can see how AO could be a shader bc it has specific attributes unique to it - but if it can be directly applied to an object, isn't it equivalent to a material? When do you use a material override vs a shader override?

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Message 2 of 3
in reply to: Anonymous

From the Maya docs:

Override the material applied to the objects in a collection in one of two ways: create a material override to override the shading group, or a shader override to override the surface shader.

A material override replaces the SG node (the shading engine aka shading group), so a material override replaces the surface shader AND the displacement shader

// Stephen Blair
// Arnold Renderer Support
Message 3 of 3
in reply to: Anonymous

Ah, thank you. I'd completely overlooked the essentials of Shader groups. That clears much up!

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