[Unity] 멀티터치(2개)를 통한 오브젝트 회전

저장용..

bool rotating;
Vector2 startVector;
float rotGestureWidth;
float rotAngleMinimum;

if (Input.touchCount == 2)
{
    Touch touch1 = Input.GetTouch(0);
    Touch touch2 = Input.GetTouch(1);

    // 배치할 오브젝트 회전
    if (!rotating)
    {
        startVector = touch2.position - touch1.position;
        rotating = startVector.sqrMagnitude > rotGestureWidth * rotGestureWidth;
    }
    else
    {
        var currVector = Input.GetTouch(1).position - Input.GetTouch(0).position;
        var angleOffset = Vector2.Angle(startVector, currVector);
       
        //외적을 통해 방향 구분
        var LR = Vector3.Cross(startVector, currVector);
        if (angleOffset > rotAngleMinimum)
        {
            if (LR.z > 0)
            {
                //반시계방향 회전, 내적을 통해 돌리는데 필요한 Power 설정
                var angleP = Vector3.Angle(startVector, currVector);
                Item = transform.rotation = Quaternion.Euler(0.0f, -angleP, 0.0f);
            }
            else if (LR.z < 0)
            {
                //시계방향 회전, 내적을 통해 돌리는데 필요한 Power 설정
                var angleP = Vector3.Angle(startVector, currVector);
                Item = transform.rotation = Quaternion.Euler(0.0f, angleP, 0.0f);
            }
        }
    }
}
else
{
    rotating = false;
}

 

출처: https://forum.unity.com/threads/rotation-gesture.87308/

Rotation gesture