Water Simulations? In modelling, NOT IN RENDERING

How about modelling “water drops” as small spheres and using an extension like MS physics to let them run down your roof? It’s not real fluid dynamics but perhaps enough for illustration purposes. To get further than that you would probably have to replace Sketchup with some seriously scientific software and forget about PCs to run it.

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I was reading through this thread basically composing your post in my head @Anssi .