Direction of Angle between two rotations.

Unity Engine
1

I am making a little 2D RTS were i often need to know the angle between a units current rotation and a “target” rotation. So far Quaternion.Angle has been sufficient but now i need to know weather the relative angle is clockwise or anticlockwise as well. I have tried using eulerAngles and ToAngleAxis but both yield inconsistent results while the unit is in motion for reasons i don’t fully understand but seem to be normal from what my googling has turned up.

So yeah. Any idea how i do this? Thanks in advance, I’m happy to try and clarify anywhere I’ve been unclear.

2

Sorry, I’m a bit tired right now and your question doesn’t seem to make much sense. Can you explain what you’re trying to do with the angles?

3

I have two rotations and i want to know the relative angle between them and weather the difference is in the clockwise or anticlockwise direction (it’s a 2d game with all rotation z axis). I hope that helps? I’m very new to this and don’t have any sort of grip on the appropriate language.

4

I think you can just do this?

float angleA = transform.rotation.eulerAngles.z;
float angleB = OtherObject.rotation.eulerAngles.z;
float d = Mathf.DeltaAngle(angleA, angleB);
if (d > 0.0f)
{
    Debug.Log("Clockwise");
}
else if (d < 0.0f)
{
    Debug.Log("Counter Clockwise");
}
5

Thanks. I don’t know why eulerAngles wasn’t working before but it’s working now.

6

The previous reply wont work the way you want it to. This seems to be working for me. You might need to adjust the axis.

Vector3 direction = targetObject.position - transform.position;
float currentAngle = Mathf.Atan2(transform.forward.y, transform.forward.x) * Mathf.Rad2Deg;
float targetAngle = Mathf.Atan2(direction.y, direction.x) * Mathf.Rad2Deg;
float deltaAngle = Mathf.DeltaAngle(currentAngle, targetAngle);
if (deltaAngle < 0.0f)
{
    //Clockwise
}
if (deltaAngle > 0.0f)
{
    //Counter Clockwise
}
1 Like