Quaternion.Angle

説明

Returns the angle in degrees between two rotations a and b. The resulting angle ranges from 0 to 180.

Example: Think of two GameObjects (A and B) moving around a third GameObject (C). Lines from C to A and C to B create a triangle which can change over time. The angle between CA and CB is the value Quaternion.Angle provides.

using UnityEngine;
using System.Collections;

// Calculates the angle (degrees) between
// the rotation of this transform and target.

public class ExampleClass : MonoBehaviour
{
    public Transform target;

    void Update()
    {
        float angle = Quaternion.Angle(transform.rotation, target.rotation);
    }
}