I skipped your code and started from scratch, drawing a ‘Soft Boundary’ by hand. I’m not thrilled by the result, the Graph Mapper can be skipped. The sliders in blue groups are significant parameters.
Fade Pattern_2022Oct26a.gh (69.3 KB)
Seems like the holes should be smaller near the edge and bigger toward the middle?
P.S. Same code with circles internalized, no need for Rhino file.
Fade Pattern_2022Oct26ai.gh (276.7 KB)