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Simple problem actually but I don't know how to figure it out. I want to a connection which fades 1 color to another color to make the connection between the elements visible or to understand it but I can't figure out how.
Is it correct that you made a special node called grouped_by? Without this .py file we can not have a look at it. Anyway, do you want to color the connections in a fading color or what?
Well, there is no gradient colorize node but I use a workaround: everything happens in the subnetwork. I use the link-node to draw the area between the surfaces. I lookup the top and bottom y values, then divide it in an arbitrary number of areas (I used 100) with the compound node. I create then the same amount of colours, also between the first hue and the second hue. I suppose you want the file? You probably need to do some extra work to adapt it to your problem and there might be another strategy but I think this might help already: good luck