Here are two videos comparing a run with lag and one without lag.
I’m making a racing game using chaos vehicle. But the physics simulation speed is dependent on the frame rate. This means that players with a lower fps also drive slower. This is of course not fair.
I included two videos in the link above that showcases this.
What I already tried:
Using a fixed frame rate. This also slows down the game time when the fixed frame rate is not reached.
Multiplying by delta time. This does nothing?
Using substepping. This just isn’t deterministic.
Is there a way to make the physics independent of the frame rate? Or another way to make the physics deterministic?
I can include images of my code when needed. Thanks in advance!
You can try enabling Physics Sub-Stepping.
“Sub-stepping improves the accuracy and stability of physics simulations, especially when performance is low or motion is complex. It works by dividing each frame’s time into multiple “sub-steps” and running the physics simulation several times within that frame, keeping the simulation consistent regardless of FPS”.
Here’s the official Unreal documentation, a forum post discussing the topic, and a few videos that can help you set it up in your project:
If you have any questions, don’t hesitate to ask again on the forum!
Hope it helps!
Thank you for the detailed explanation! But I already saw these articles. Substepping still doesn’t work when you get a lag spike. And it is not precise enough for my game. People will compete for the fastest time. So I don’t want things like frame rate to have influence at all. Multiplying by delta time doesn’t work either. I included an image of how I apply gas bellow:
