Thank you, for the info: https://vuo.org/node/2607, and the composition, it's true that the data is quickly saturated. How to have more amplitude to draw. I can only draw in the center of the frame how to do ?
Similar to HTML/CSS and Quartz Composer, Vuo renders layers in order from back to front. On nodes such as Combine Layers (Group) and Render Layers to Window, the 1st input goes in the back, the 2nd goes on top of that, and so on. If the opposite seems more intuitive to you, then you can feed the layers through Reverse List before passing them on to a layer node.