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I have a subtraction of two meshes, for the sake of clarity, let's pretend I'm subtracting a sphere from a cube. I would like to change the material on the faces of the cube that were generated by the subtraction. I thought I could use the Intersecting edges output from the Mesh boolean node, but it doesn't change anything

Image of the node setup

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Hello and welcome Alessandro Di Cicco, the out-put Intersecting Edges of the Mesh Boolean select the contour not the surface. So to be able to do what you want you have to use a Geometry Proximity node and Less Than of a Math node like this:

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Have a nice day.

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