I'm trying to recreate the effect of small pieces of dry ice propelling themselves across the surface of water.
First step was to figure out the propulsion. Thought I'd post my solution in case anyone was interested.
The basic approach is to take a number of points on the surface of an object and use their normals as propulsion vectors to move and rotate the object in a (somewhat) physically accurate way.
The points and normals can vary over time to create more random behaviour.
This can probably be incorporated into dops somehow but haven't looked at that yet.
It is also entirely likely that this is trivial to do in some other way and I've wasted my time. If so, please let me know.
mt__propulsion__1_0.hdalc