I made this part of the model:
What I need is to smooth the edge of the two materials. Similar to this question: How can you smooth the edge between two materials?
But the problem is that the waves orientate at the wrong direction and there should be only one wave. That means the edge (blue line) between the two materials shouldn't be like this:
The edge should be basically a circle, like this:
And this is my current node setup:
So how could I change the orientation of the wave and make the edge go for a 360°?