Signed Angle flips randomly

Question

i'm very new to non visual scripting in general (my third day) i want to get angle between input direction and where character is facing (3d third person game) to play turning animations, so i need it in + and - to determin left and right

$InputDir/InputDirPos.global_translation.signed_angle_to($Mesh/MoveDirPos.global_translation, Vector3.UP)

(meshes are for visualisation) black sphere is for input direction, and white sphere is for where character facing

and finally the problem, when i just walk around in circles angle just randomly switches from + to - and i have no idea why, i tried different sppeds for input and character facing thinking that maybe input just went too far, but nope, it doesn't matter if angle is 5 degree or 90, and it seems to be related to global position

Mullite

Answer 1

Direction vector from point A to point B is calculated by subtracting the position of B from the position of A.

Grisham

Answer 2

You need to get the angle between direction vectors, not between positions as you're currently doing.

Grisham

Answer 3

i'm not sure how to do this, what should i look for in documentations? i'm currently trying to look for a mention of "direction" anywhere there

Mullite

Answer 4

thank you so much, it worked, it may be not the best implementation from me but i'm glad it's finally works
and the code i used is this

var Angle = 0
var AngleDir = Vector3.FORWARD
var AngleDir2 = Vector3.FORWARD

func _physics_process(delta):

	AngleDir = $InputDir/InputDirPos.global_translation - $InputDir.global_translation
		
	AngleDir2 = $Mesh/MoveDirPos.global_translation - $Mesh.global_translation
		
	Angle = rad2deg(AngleDir.signed_angle_to(AngleDir2, Vector3.UP))

Mullite

Answer 5

marking best answer

Bessel

Answer 6

Curious if you'd be willing to share what your script looks (looked?) like for this instance? I'm still relatively new to Godot and have been banging my head trying to figure this exact scenario out. Thanks!

Brumal

Answer 7

AngleDir = $InputDir/InputDirPos.global_translation - $InputDir.global_translation literaly just this to get a direction vector

Mullite