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:
Choose "Make group"
Connect color to group output.
Select your nodegroup and another color, add a mix node and connect like this:
Now add your nodegroup to all your materials.
If you change your nodegroup e.g. the scale, all materials will change as you want.