I've been searching for a partner to code with me or a while now (without any measurable success). In order to get things moving though i have started messing around with processing hoping to figure out some code even if it is not in the software that i will use in the end. AND (yay!) i have managed to do a decent job of getting the code to draw with the light. Basically i used a processing version of the blend mode in photoshop. Here's an image of a rather dubious tree i drew with it.