유니티 픽셀 사이즈 설정

public float SetPixelSize(float _pixelRate)
    {
        cam= GetComponent<Camera>();
        Vector3 p1 = new Vector3(1, 0, 0);
        Vector3 p2 = new Vector3(2, 0, 0);

        p1 = cam.ScreenToWorldPoint(p1);
        p2 = cam.ScreenToWorldPoint(p2);

        float pixelSize = p2.x - p1.x;
        pixelSize *= _pixelRate;
        
        return pixelSize;
    }