Pressure
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Pressure should be in solids when forces are applied to them, including gravity. This would allow making things like support structures, which don't do anything right now. It would also make shape matter for things that get pressure, and things should break where there is a lot of pressure. Pressure and waves should also be in water.
I know this would be super complex, but it still would be cool.
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I'd rather not have any additional lag that such things would very likely introduce. Not to mention the bugs...
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For stress in solid structures, TPT actually had a test implementation forever ago. It was way buggy and in general nobody bothered to refine the implementation. However, for water waves, I think there's a pretty alright system in place already - just use pressures that are relevant to the scale of the waves. The only thing missing from water / liquids is surface tension.
