Mathf.DeltaAngle

public static float DeltaAngle (float current, float target);

설명

Calculates the shortest difference between two given angles given in degrees.

using UnityEngine;
using System.Collections;

public class ExampleClass : MonoBehaviour {
    void Example() {
        Debug.Log(Mathf.DeltaAngle(1080, 90));
    }
}