ResolutionManager.InitializeResolutionSettings C# (CSharp) Method

    public void InitializeResolutionSettings(float targetaspect)
    {
        // determine the game window's current aspect ratio
        float windowaspect = (float)Screen.width / (float)Screen.height;

        // current viewport height should be scaled by this amount
        scaleHeight = windowaspect / targetaspect;

        // obtain camera component so we can modify its viewport
        Camera camera = Camera.main;

        // if scaled height is less than current height, add letterbox
        if (scaleHeight < 1.0f)
        {
            Rect rect = camera.rect;

            rect.width = 1.0f;
            rect.height = scaleHeight;
            rect.x = 0;
            rect.y = (1.0f - scaleHeight) / 2.0f;

            heightShift = rect.y;

            //camera.rect = rect;
        }
        else // add pillarbox
        {
            scaleWidth = 1.0f / scaleHeight;
            scaleHeight = 1;

            Rect rect = camera.rect;

            rect.width = scaleWidth;
            rect.height = 1.0f;
            rect.x = (1.0f - scaleWidth) / 2.0f;
            rect.y = 0;

            widthShift = rect.x;

            //camera.rect = rect;
        }
    }