DR:

How would I do "s", "r" and "bruiseblender"?

You can't do "s" because "s" is the whole surface and you can't make a single parameter out of a whole surface.

You don't want to do "r" because r is not a set parameter, it s a per-pixel calculated value. It represents how far you are from the cx,cy coordinate. We use that as input to the Scale function inside the ColorRamp.

I assume you wanted to control "bruiseblender", or in other words, the maximum strength of the effect. But that is the variable "maxblend" which we use as one of the factors in calculating bruiseblender. So just make the ".5" be the parameter:

maxblend = Add(.5).labelled("PM:Bruise Max Blend")

 

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