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I have a lot of meshes of hair ( with their own node setup/uvs/textures/materials ) that forms a complete haircut.

How can i make a node , like a color ramp , that will affect all these meshes at the same time?

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just for an example, you can put nearly everything in your node group:

Add these two nodes:

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Select both,

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Choose "Make group"

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Connect color to group output.

Press Tab.

Select your nodegroup and another color, add a mix node and connect like this:

enter image description here

Now add your nodegroup to all your materials.

If you change your nodegroup e.g. the scale, all materials will change as you want.

enter image description here

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