I have made some drawing with it that I would like to insert into another drawing (also done in Processing). My problem is that some kind of opaque background covers the intial drawing. Any idea what I must do ?? I have read stuff about PGraphics to get a transparent background (using the alpha parameter) but I'm afraid I do not fully understand how to get it to work. (I am not familiar with graphics programming)

Here is a copy of the drawings, before and after inserting the second drawing done with the Terrapin library.

Thanks for your help.