Hello I want to simulate physics for certain objects. How can I do this ? Thanks in advance!
You cannot unless those Rigidbody(2D) are in a separate Unity scene with a Local Physics set-up. You can then simulate that local physics scene in isolation. You cannot select specific bodies in a physics scene to simulation though.
This feature though is typically used for things like calculating projectiles etc but is generalised.
In a future Unity release, for 2D physics only, the ability to simulate “groups” of Rigidbody2D will be available. I do not know however if this feature will be available for 3D physics.
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