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So through watching tutorials on YouTube I've learned how to change the colour of an object based on its Z orientation using a ColorRamp while only using one material. However, I'd like to also know if there's a way to make objects which are higher up have a lower emission strength without making loads of different materials, as I would have a lot of objects to work through.

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I'm not sure which tutorial you followed, but you probably have something like this in your node setup. Just add an invert node between the colorramp and separate XYZ node.

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