Quaternion.Angle and 360 degrees

Question

Hi!

I need to receive a angle between rotations of two objects from 0 to 360 degrees. However the function "Quaternion.Angle" produces value from 0 to 180.

public GameObject Object1, Object2;
void Update () {
    Object1.transform.Rotate (Vector3.up * 10 * Time.deltaTime);
    float angle = Quaternion.Angle (Object1.transform.rotation,
            Object2.transform.rotation);
    Debug.Log (angle);
}

Thanks.

Answer 1

Answer by mrde · Jan 27, 2011 at 12:08 PM

you can fix one time dot product of these two GameObject forward dot product Vector3 up = dot(object1.transform.forward, object2.transform.forward); and ever@ interpolate state compare direction dot with up (in normalize mode), it must be same vector or invert vector, if dot is invert vector that mean (angle = 360 - angle)

void Start() { Vector3 right = object2.transform.TransformDirection(Vector3.right); Vector3 up = Vector3.dor(object2.transform.TransformDirection(Vector3.forward), right); }

void Update() {
Object1.transform.Rotate (Vector3.up  10  Time.deltaTime);
Vector3 newup = Vector3.dor(object2.transform.TransformDirection(Vector3.forward), object1.transform.TransformDirection(Vector3.forward));
    float angle = Quaternion.Angle (Object1.transform.rotation,
            Object2.transform.rotation);
if (up.normalized != newup.normalized) {
angle = 360 - angle;
}
}

not tested.

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Jesse Anders · Jan 27, 2011 at 01:14 PM 0

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Did you mean TransformDirection()? Also, you don't have to write 'Vector3 right = object2.transform.TransformDirection(Vector3.right);'; you can just write 'Vector3 right = object2.transform.right;'.

mrde · Jan 27, 2011 at 02:08 PM 0

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Thanks for fix.

Quaternion.Angle and 360 degrees

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