0 votes

I want my rigidbody to rotate every time i pressed input- (flap) which is key f. But not working here.

func _input(event):
    if event.is_action_pressed("flap"):
        rot+=10
        set_rotation(rot)

Working in:

func _physics_process(delta):
 rot+=10
 set_rotation(rot*delta)

There is no problem about taking input it just works fine. Just not setting rotation even if values changes after input(event) called. What is the reason? Thanks in advance.

asked Jul 1, 2019 in Engine by TKT (35 points)

1 Answer

+1 vote
Best answer

From the RigidBody2D's description:

(...) You do not control a RigidBody2D directly. Instead you apply forces to it (gravity, impulses, etc.) and the physics simulation calculates the resulting movement based on its mass, friction, and other physical properties.

(...)

Note: You should not change a RigidBody2D’s position or linear_velocity every frame or even very often. If you need to directly affect the body’s state, use _integrate_forces, which allows you to directly access the physics state.


You can't change the a RigidBody2D's rotation anywhere outside of _integrate_forces. Even if you change it in _physics_process, it will jump back to its initial value after you release the key, that's why you need a rot variable there.

To change the rotation, there are a few ways:

apply_torque_impulse():

func _input(event):
    if event.is_action_pressed('flap'):
        apply_torque_impulse(1000)

or:

func _integrate_forces(state):
    if Input.is_action_pressed('flap'):
        state.transform = Transform2D(rotation + 10, position)
        # or
        angular_velocity = 10
answered Jul 1, 2019 by Dlean Jeans (3,911 points)
selected Jul 1, 2019 by TKT
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