CG fluid, especially "SPH" fluid (smoothed particle hydrodynamics), suffers from inaccurate physics at the microscopic level, at the scale of individual particles making up the fluid. Even when simulating with very large particle numbers, this becomes a major problem wherever the fluid becomes splashy since it forms thin sheets and strings -- or rather, it should form thin sheets and strings, like we see in real water. Hi-speed macrophotography of fluid spashes classically show how delicate, impossibly thin and continuous sheets of fluid fly thru the air and stay coherent for prolonged periods. These produce tiny droplets and hair-like strings of fluid from their margins but otherwise hold together for a long time, before they eventually and suddenly burst apart. CG fluids on the other hand always break apart immediately, forming very unattractive and distinctly un-real cheese-like holes and webbing, never holding together in thin sheets. This has generally been the limit of CG fluid applications, and is what drives studios to have expensive table-top practical shoots, since CG fluids simply haven't been able to reproduce the very particular small-scale features of real fluids -- until now.
Cg Fluid R&d Breakthu
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