Making Radial vortex in Unreal

Hi guys. I wonder if someone has a good idea about preventing the very obvious center of polar-uv’s from appearing in the final result:

image

Here I add a radial gradient in combination with smoothstep but:

(a) this gives a center-area which is 1.0 and this means a gradient-map would not catch nice gradients to colorize the center. it would be only 1 constant color.

(b) the radial gradient is still noticable.

2019-11-29_00-17-53

Does anyone has a better idea?

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