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So I have a gold glossy surface above a plane, and I want the plane to have a black and white reflection of the gold surface. I'm using Cycles Render and the latest version of Blender.
Here's a diagram to show you what I mean:


Glossy object right here -> O

< <- Camera

_______________________ <- Glossy plane


I want the object to be gold, and I want its reflection on the plane to be black and white.

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You can use the light path node. This node allows you to use different materials for each incoming ray type.

enter image description here

However, this approach is not ideal, since you have to modify the object's material and not the glossy material itself, which becomes almost unmanageable quickly.

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