Improved kinematic body, Now can move rigid body

[AndreaCatania]

Now kinematic body can interact with rigid body.

Fixes #16329
Fixes #13148

[AndreaCatania]

Now it's possible to push even with 2D kin body

[akien-mga]

Thanks, great feature :)

[MarianoGnu]

Amazing!

[mrcdk]

You forgot to update the RigidBody.test_motion() bindings here https://github.com/godotengine/godot/blob/master/scene/2d/physics_body_2d.cpp#L890 to add the infinite_inertia parameter

[AndreaCatania]

Oh thanks you... I forgot it because yesterday I got some issue with bindings so I removed it from all bindings to test it and apparently I forgot to re-add it.

Thanks you

[David-Ochoa]

I'm having problems waking up rigid bodies with Kinematic bodies, I don't know if it is the same issue, I'm adding a little project to show the problem.
PhysicsTest.zip

[AndreaCatania]

@David-Ochoa you have to use only one move_and_slide here the correct player physics process:

func _physics_process(delta):
	var vel = Vector3()
	if (Input.is_action_pressed("ui_up")):
		vel += (Vector3(0,0,-velocity))
	if (Input.is_action_pressed("ui_down")):
		vel += (Vector3(0,0,velocity))
	if (Input.is_action_pressed("ui_left")):
		vel += (Vector3(-velocity,0,0))
	if (Input.is_action_pressed("ui_right")):
		vel += (Vector3(velocity,0,0))
		
	vel += Vector3(0,-10,0)
	move_and_slide(vel, Vector3(0,1,0))

[David-Ochoa]

@AndreaCatania : I made the changes but still it is not working, one ball hits the "player" before hiting ground, that one can wake up other rigid bodies but player can't, here is a video:
Kinematic vs Rigid body test

[AndreaCatania]

@David-Ochoa Fixed: #18138, Can you please confirm it?

[David-Ochoa]

@AndreaCatania Yes, it is working now, thanks and great job.

[ghost]

Just a heads-up. The engine parses the old move_and_slide's 3rd parameter (float) as bool without errors, and the character won't move as expected.

For example:

move_and_slide(vel, Vector3(0,1,0),       0.05,         4,   MAX_SLOPE) # 3.0.2
# is parsed as...
move_and_slide(vel, Vector3(0,1,0), true,    4, MAX_SLOPE, deg2rad(45)) # Master
# which should be...
move_and_slide(vel, Vector3(0,1,0), true, 0.05,         4,   MAX_SLOPE)

Should be added to the list of known incompatibilities for the next version.

[nazgum]

Ok so how can we make KinematicBody2D not push RigidBody2D's around, if we don't want that behavior? So it works like in 3.0?

I have a top down game where enemies/crates are RigidBody2D, and after upgrading to beta 3.1, the player can push enemies/crates around now. Changing Mass, Friction and Linear Damp seem to not help in stopping this new behavior.

Update: for anyone else who runs into this, I found out it can be controlled with the infinite_inertia option which is set in move_and_slide; true means you push rigidbodies, and false means you don't =)

[MarianoGnu]

If you use move_and_collide instead of move_and_slide you wont push bodies

[michaeltintiuc]

Does this also mean that rigid bodies will not move a stationary kinematic body if infinite inertia is on? Also how would you control the force with which kinematic bodies move rigids around, in 3.0 properties like mass and weight are not taken into account