I found something I can't understand. I'm only a beginner, so I thought I could use the CarController Scripts of the Car Demo for making a little driving game with different models.
the Car demo I wonder why the colliders are sub-objects and the RigidBody has "Gravity-Enabled" without falling apart.
my try to copy my model falls apart with the same configuration.
1.what's exactly my mistake?
2.How can I fix this?
3.Should I rather write a script for applying the gravity to my model?
Most likely all of your objects with Colliders have also Rigidbody component. Try removing all these components and leave only one on a root object.