This is very cool, but I think a better avenue of exploration for this is via plugins. This is unlikely to be fast enough for game applications, but for level authoring it could be a useful terrain scrulpting tool.
Nice resource, for what @PeZsmistic said you are able to simulate physics with a plugin. Using RunService:Run() which will only work in command bars and plugin scripts.
hey so uh sorry for bumping this but how do i activate it? im not that good of a coder and im trying to find something to do when im bored. but i cant get this to activate (or at least make terrain flow)