Relationship between `Tick Physics Async` and `Substepping`

[sergio.gardeazabal]

Hi,

Substepping Async is not used anymore and should be deprecated.

Other than that, you are correct. Substepping and Async Phyiscs are mutually exclusive.

In Async Physics if you want a smaller dt, you just set the Async dt to the smaller value you want.

In case it helps, I explained a bit how async physics works to achieve the target dt here in another post a while ago.

Is Async Physics Tick really async?

Hi, Yes, async physics is actually async, but that specific callback still runs on the Game Thread each time the physics simulation is advanced one step. See FPhysicsSolverFrozenGTPreSimCallbacks and FAsyncPhysicsTickCallback::OnPreSimulate_Internal It works in this way: Non-Async physics (default) We have two representations of the state of the physics simulation. One is the game thread state (this is what you access when you use any of the existing APIs that do not talk directly to the ph…

Note: Improving the physics settings to remove legacy options, and improve it is on our radar.