3D texture with ramp or file, Maya & VRay

Hey guys,

This is probably a noobish question but I just can't figure it out..

So I want apply a ramp to shader. I want the ramp to move around on the surface of the object when the object moves.

This works fine with the "Crater"-texture but VRay doesn't support this texture. How do I apply the same effect with a "Ramp" or "file"?

I can't create a "3d Placement"-node and simply connect it to a ramp/file. Nothing seems to work.

Thankful for any reply!

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