Strange physics behaviour trying to simulate a soccer ball

aegroto

Hello Godot's users! Sorry if this may seems a stupid doubt, that's my first project in Godot.

I'm trying to simulate a soccer ball hitting obstacles running on a field using physics, but the behaviour I get is this one:

This is the setup of the ball's rigid body:

This is the setup of the field's rigid body:

I can't understand why the ball keeps oscillating for some seconds initially.

Also, if I apply a force or an impulse to the ball, it takes too much time to stop even if the friction is set to 1. Is there a way to speed it up without implementing a custom physics integrator?

wombatstampede

Did you scale one of the bodies or collisionshape to another value than (1,1,1)? Because that might pose problems.

You can use linear damping to stop the ball.

aegroto

Maybe I've scaled one of the spatials, but why should it generate a problem? No force is being applied to the ball apart from the gravity, so it shouldn't oscillate like this.

wombatstampede

Scaled Collision Shapes (directly or indirectly via parent nodes) can cause strange behaviour. So it is just an idea to rule that out.

You can scale MeshInstances but I'd refrain from scaling Collision Shapes, PhysicsBodies and their parent nodes. It does not have to be the reason here but I'd give it a try at least (especially concerning the floor).

aegroto

Actually, I've scaled the MeshInstance and the collision shape derived from that mesh is scaled as well. Isn't there a way to generate the collision shape based on the vertices to not duplicate the transforms?