Ah yes, I found the solution. I added it to my question 
It works
ps. I found it thanks to the source code linked by @neilcsmith at Is it possible to extend the classes PGraphics/ PGraphics3D?
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Ah yes, I found the solution. I added it to my question It works
ps. I found it thanks to the source code linked by @neilcsmith at Is it possible to extend the classes PGraphics/ PGraphics3D?