How do I simulate water droplets realistically falling, gathering, and flowing down a window? For example, see http://www.youtube.com/watch?v=4jaGyv0KRPw. In particular, I want to simulate how smaller droplets merge together to form larger droplets that have enough weight to oppose the surface tension and flow downward, leaving a trail of water.
I'm aware of fluid simulation, but how would it be applied in this situation?
Answer
There was a good rain-on-glass simulation in the ATI Toy Shop demo from a few years ago. See the video starting at 1:30; and here are detailed slides on how all the rain effects work.
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