I'm making a procedural texture, and I want to expose the following values so that they are controlled by a separate node.
I'm using the Cycles material node editor
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If you just want the Scale values from the Mapping node, it is simpler to use the MixRGB. Just plug the vector in the input A, use the CombineXYZ for input B with your [scaleX, scaleY, scaleZ] values, operation to 'Multiply' and the factor to 1.