Hinge jointssss

Unity Engine
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1

Im testing some simple car,im using joints. Main car body (large cube) weights 1000 kgs. There are like two disks and on each disk is one wheel that is atached to that disk with a hinge joint. Hinge joint is allowing wheel to spin in one direction. Why is wheel bending when turning left or right

Joint
Joint1920×1030 150 KB

and what is easy fix for this problem

2

A fix that doesnt include reducing weight of a car body

3

Some solutions that don’t include changing the weight of the car body:

  • Increase the mass of the wheels. Bending happens when there’s a significant difference of mass between the attached bodies.
  • Increase the physics update rate by reducing the fixed timestep at Project Settings > Time > Fixed Timestep. Default is 0.02 (50 Hz). Try 0.01 (100 Hz), or if CPU footprint is not an issue, feel free to try 0.002 (500 Hz) or even 0.001 (1 KHz).
4

If you don’t want to change the mass of the car body, it’s also possible to change the mass of the wheels :wink:

Kidding aside, the PGS solver tends to be very unstable at mass ratios greater than 1:10 and they are best avoided. When you can’t avoid it, like in this case, try adjust the connected mass scales that are available on every joint type. Should work really well in this case. Hope it helps.

Anthony.