Make constant linear velocity follow object's rotation

[max_godot]

Godot Version

4.2.1

Question

I have an object that has a constant velocity of 1 m/s on the x-axis

If I now rotate the object by 90 deg on the y-axis I have to adjust the constant velocity to -1 m/s on the z-axis and set the x-axis to 0 m/s

Is there a way to make the constant velocity’s axis follow the rotation of the object so I don’t always have to update them?

Max

[tayacan]

Yeah, you can multiply the object’s transform.basis with the direction, that should give you exactly what you need. Quick code example:

var new_direction = transform.basis * old_direction

It might behave weirdly if the object has a scale that isn’t (1, 1, 1), but it looks like your object doesn’t have that problem.

[max_godot]

Thanks @tayacan I ended up using the global_transform

var newVelocity = global_transform.basis.x * speedMultiplier
set_constant_linear_velocity(newVelocity)

That seems to work just fine for me