lerp_angle() just isn't working for me

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:bust_in_silhouette: Asked By The Benjameister

I am creating a 3d Isometric platformer where the gimmick is that you need to rotate the camera to navigate the game properly. My camera node is comprised of two parts, a Camera Pivot and the camera itself.
I have a basic version of the turning already made, when the player presses the camera turn right button for example, rotation_degrees.y += 90 is called, rotating the camera 90 degrees as intended. Full code here :

extends Spatial

func _process(delta):

if Input.is_action_just_pressed("camRotateRight"):
	rotation_degrees.y += 90
if Input.is_action_just_pressed("camRotateLeft"):
	rotation_degrees.y -= 90

The issue is that this rotation is instant, and I want a smoother rotation. I’ve tried the following (still for the rotation to the right example) but it doesn’t work : rotation.y = lerp_angle(rotation.y, rotation.y + (PI/2), 1)
Instead of rotating between the two angles, it instead instantly rotates to a smaller angle (0 to 15 degrees instead of 0 to 90).
Does anyone know what’s going on here and how I could fix this? Thank you!

:bust_in_silhouette: Reply From: USBashka

You didn’t say much but I’ve understood everything

The problem is you’re trying to rotate camera in _input function. But lerp_angle() not rotates angle but return a interpolated value of it. For smooth rotation you need to do it from _process function. Like this:

export var camera_speed = 10  # rad/sec

func _process(delta):
    rotation.y += Input.get_axis("ui_left", "ui_right") * delta * camera_speed

Unfortunately this isn’t what I’m looking for. This is a constant rotation. I want to make it such that if I press the button once, the camera is rotated by 90 degrees and stays at that new angle, hence the rotation_degrees += 90 I already have this in my _process() function. Here is my exact code :

extends Spatial

func _process(delta):

if Input.is_action_just_pressed("camRotateRight"):
	rotation_degrees.y += 90
if Input.is_action_just_pressed("camRotateLeft"):
	rotation_degrees.y -= 90

The Benjameister | 2022-07-31 12:00

Oh. Okay, sorry. Here’s solution:

extends Spatial

var target_rotation = 0 #Initial rotation

func _process(delta):
    if Input.is_action_just_pressed("camRotateRight"):
        target_rotation += PI/2
    if Input.is_action_just_pressed("camRotateLeft"):
        target_rotation -= PI/2
    rotation.y = lerp_angle(rotation.y, target_rotation, 0.5)
    

USBashka | 2022-07-31 12:12

Perfect! Exactly what I needed!

The Benjameister | 2022-08-02 09:25