Using google this came up when looking for
"water droplets simulation":
http://www.cs.unc.edu/~lin/COMP259/LEC/29b.ppt
Its pretty interesting and perhaps, when I get the time to
understand it, I'll implement it. Could be useful, at least
for meshes (and windows can easily be done with
meshes).
--
Tim Nikias
Homepage: http://www.digitaltwilight.de/no_lights/index.html
Email: Tim### [at] gmxde
de