I'm thinking about doing another project using the 3D physics library JBullet (the Java port of Bullet) and I did a very basic example today that I thought might be helpful for anyone interested in using JBullet with Processing. I had previously released the code for a game like experiment with JBullet ( https://forum.processing.org/topic/jbullet-experiment), but that code was fairly complicated. The new example is on OpenProcessing: http://www.openprocessing.org/sketch/97086
I hope its helpful. I would be interested to see more people working with this.