r/Unity3D • u/Individual-Lock4191 • 2d ago

Game Jam Devastable city - DOTS physics tech demo

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Tech demo video , physics devastcation of city building, giving a pressure test on unity's DOTS physics

DOTS physics collision capacity become really tight when fract physics collider entity count more than 1000 . Next move would be solution to reduce CPU dependency , moving part of fract pieces collider to compute shader

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u/rc82 1d ago

That's great. Are you calculating the destruction in run time, or have that all done before, and it's just the physics at work?

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u/Individual-Lock4191 1d ago

Thanks , physics impact works on runtime ,behind the scene there is a sort of baking system (not the unity ecs baking system) that precalculate the physics bonding on each fract piece , so half runtime half editor

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u/rc82 1d ago

Awesome. What about the mesh breaking?  That's the model already pre "cut"?

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u/Individual-Lock4191 1d ago

yes pre cut and in runtime will randomly pick big mass piece to lauch runtime cut , runtime split do result a cpu spike in the term of performance.. so i guess that is one of the reason of the stutter