chaos vehicle dynamics tire model

Development Programming & Scripting
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Hi everyone,

I’m working with UE 5.5 Chaos Vehicle, and I’m trying to replace the default friction algorithm in WheelSystem.cpp with a Magic Formula (Pacejka) based on slip ratio. However, I’m running into issues.

From what I can tell, there are two main problems:

  1. Slip ratio definition – I think I need to handle the singularity point properly.

  2. Wheel state update – Something feels off. The original code only seems to add groundVelocity + slipOmega.

I tried updating wheel angular velocity like this:

omega += deltaTime * (Torque - Re * forceFromFriction.X) / inertia;

But with this approach, the wheel spins up way too quickly.

Are there any references, documentation, or example implementations for this?

Thanks a lot for any help!