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2D Rotation Spring Back To 0 Degrees (JavaScript)

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Hi all, I'm working on making a 2D platformer game that has a shooting element. What I have is a script that gets the touch input and rotates the gun towards the touch location. What I need to do is have it always try to move back to 0 degrees gradually. I've tried a Lerp but I couldn't get it to work correctly. Here is what I have: for (var touch: Touch in Input.touches) { mouse_pos = Input.mousePosition; if (touch.position.x > Screen.width / 2){ mouse_pos = Input.touches[0].position; mouse_pos.z = 5.23; //The distance between the camera and object object_pos = Camera.main.WorldToScreenPoint(target.position); mouse_pos.x = mouse_pos.x - object_pos.x; mouse_pos.y = mouse_pos.y - object_pos.y; angle = Mathf.Atan2(mouse_pos.y, mouse_pos.x) * Mathf.Rad2Deg; angle = Mathf.Clamp(angle, -22, 40); transform.rotation = Quaternion.Euler(Vector3(0, 0, angle)); } } So if you know how I might achieve this I'd greatly appreciate all suggestions or solutions, thank you very much!

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