Simulation is framerate dependent

[unity_m0YR-bwAdMHOKw]

I’ve noticed that anything I do on the Physics Samples project showcasing havok is also timestep dependend. Even creating an empty script and checking deltaTime during the update function I can see that deltaTime is always around the values you’d expect for 60fps performance, even if it is really going at 10fps. Using Application.targetFrameRate to set low framerate results in slow motion simulation.

Can someone help me understand why this happens? I would like my simulations to be frame rate independent.

[unity_m0YR-bwAdMHOKw]

Okay I found a solution here:

How to do frame-rate independent physics in DOTS

I'm trying to get my physics to be frame-rate independent in DOTS. It seems that both Unity.Physics and Havok.Physics use UnityEngine.Time.fixedDeltaTime, but process physics every graphics frame. The result of this is that the higher the framerate is, the faster things move around given the same PhysicsVelocity values. An easy way to see this is to simply increase the "Fixed Timestep" in edit->project settings->time, so that it doesn't match your framerate. from "Unity.Physics\ECS\Systems\Bui…

[Mayumichi]

There’s a pinned post which leads you to more in depth info about the variable rate systems in the current version

Fixed Timestep and Frame Rate Dependence

Hi all! Because it is a question that arises here perennially, I wanted to make sure you all saw this post by @cort_of_unity describing upcoming changes to system stepping and fixed timesteps. If you have questions or feedback on the design, please use his thread.

The actual thread linked there

Fixed timestep features coming to Entities / DOTS Physics packages

Hello -- my name is Cort, and I'm one of the engineers working on the Entities package at Unity. One feature we've had many requests for in DOTS is the ability to update an ECS system with a constant, frame-rate-independent timestep, similar to the .FixedUpdate() method on MonoBehaviours. In addition to being a critical requirement for stable, deterministic physics simulation, this feature has many applications in gameplay code as well. I'm pleased to report that fixed timestep system updates …