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When rotating 2D sprite towards cursor via angularVelocity, it spins at one point
Intro
I've created a spaceship sprite in my Unity project, I wanted it to rotate towards the cursor via angular velocity, because I'd like make my game to be heavily physics based.
Problem
Now my problem with rotating the sprite via by angular velocity is the following:
At -180° / 180° rotation my ship spins around, because while my mouse's angle is already 180°, while my ship's rotation is still -180°, or the other way around.
I tried
I tried to solve it mathematically, wasn't too successful, I could make it spin the right way just much slower/faster, I could fix the 180/-180 point, but made two different ones instead.
Looked for different solutions, but couldn't find a more fitting one.
Code
So I have this code for the rotation:
// Use this for initialization
void Start () {
rb = gameObject.GetComponent<Rigidbody2D>();
}
// Update is called once per frame
void Update () {
//getting mouse position in world units
mousePos = Camera.main.ScreenToWorldPoint(Input.mousePosition);
//getting the angle of the ship -> cursor vector
angle = Mathf.Atan2(mousePos.y - transform.position.y, mousePos.x - transform.position.x) * Mathf.Rad2Deg;
//getting the angle between the ship -> cursor and the rigidbody.rotation vector
diffAngle = angle - (rb.rotation + 90);
//Increasing angular velocity scaling with the diffAngle
rb.angularVelocity = diffAngle * Time.deltaTime * PlayerShipStats.Instance.speed * 100f;
Answer by Crooked97 · Jan 20, 2017 at 12:32 PM
Inserting this code made it work:
if(diffAngle > 180) {
diffAngle -= 360;
} else if (diffAngle < -180) {
diffAngle += 360;
}
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