RigidBody apply_impulse not working with linear damping = 1 with Bullet physics

[karroffel]

Operating system or device, Godot version, GPU Model and driver (if graphics related):
Arch Linux (also observed on Windows 10), Godot 3.0 beta-1

Issue description:

When using a RigidBody in character mode with linear damping = 1 then apply_impulse does not move the body at all.

When switching the physics server back to GodotPhysics then it works.

When using Bullet as a physics engine the result should be the same as with the old physics engine.

Steps to reproduce:

• Create a RigidBody, set it to character mode. Make sure it doesn't fall down into the void of meaninglessness where you can't observe the bug.

• Set linear damping to 1.

• in _physics_process use apply_impulse.

• see that it's not moving the RigidBody

• switch to GodotPhysics

• observe that it does move the RigidBody

Link to minimal example project:

ApplyForceWithDampingBullet.zip

[AndreaCatania]

I'll check it soon

[AndreaCatania]

I've tested it and it seems fine. The damping in bullet works differently from Godot physics so this statment is not always true:

When using Bullet as a physics engine the result should be the same as with the old physics engine.

In this case the parameters should be changed according physics engines

[akien-mga]

So it's not a bug I guess? If so the documentation should be updated to mention this difference between both engines.

[AndreaCatania]

@akien-mga yes i think so

[akien-mga]

Superseded by godotengine/godot-docs#2161.