Help with interpolating rotation based on movement vector

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1

Godot Version

4.4.1.stable.mono

Question

func process_physics(delta: float) -> State:
	var raw_direction = Input.get_vector("mov_left", "mov_right", "mov_up", "mov_down").normalized()
	var mov_direction = Vector3(raw_direction.x, 0.0, raw_direction.y).rotated(Vector3.UP, parent.cam_anchor_y.rotation.y)
	var face_direction: Basis
	if mov_direction != Vector3.ZERO:
		face_direction = Basis.looking_at(mov_direction)
		parent.velocity = mov_direction * speed
		parent.char_anchor.basis = parent.char_anchor.basis.slerp(face_direction, 0.2)
	parent.move_and_slide()
	return null

This is my current code for moving my player character during their “walking” state, currently this works perfectly fine for movement, but the interpolation I am using sometimes causes the character to rotate up slightly if the movement direction changes quickly. For obvious reasons I would like to make it so the character only rotates on the y axis; what would be the simplest change I could make to achieve this while keeping rotation interpolation? maybe there is another form of interpolation I could use? I am still very new to GDscript.

2

In theory, rotation would be constrained to Y axis, if the y component of your mov_direction does not change. Make some tests to see where and how it changes.

3

well, embarrassingly enough I cannot currently replicate what I was experiencing, I will report back when I manage to replicate it though

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