Another update which I was unable to post - weighted motion blur! The system now accumulates (thanks Pottuvoi) the frame with a weighted value, which is sampled by an editable curve.
Having the ability to shape the motion blur with a curve gives an artists an enormous amount of control over how the motion blur looks. In the latest example the sparks at the very beginning of the video were replaced with simple circles, simulating real sparks. The weighted arch visual that you see is the affect of the motion blur doing its thing.
Traditionally this particle system uses a shaped particles which changes its direction based on velocity. Now we are no longer emulating the effect, we are capturing it!
