G'Mic-Qt shaperelevant ?

[denzjos]

 , dyslexia, weird, but it sometimes happens to me. By the way, after correcting the code :
   
Rich, I don't think there is more effort needed to solve this problem. The result (your example) is not as spectacular as seen in the G'Mic-Qt example. I was expecting something else. 
So, thank you for the effort.