C# ScreenVector

[xtmem]

private static ScreenVector WorldToScreen(float x, float y, float z)
        {
            float w;
            float sx;
            float sy;

            sx = VMatrix.M11 * x +
                VMatrix.M12 * y +
                VMatrix.M13 * z +
                VMatrix.M14;

            sy = VMatrix.M21 * x +
                VMatrix.M22 * y +
                VMatrix.M23 * z +
                VMatrix.M24;


            w = VMatrix.M41 * x +
                VMatrix.M42 * y +
                VMatrix.M43 * z +
                VMatrix.M44;

            if (w < 0.01f)
                return new ScreenVector()
                {
                    Result = false,
                    X = 0,
                    Y = 0
                };

            float invw = 1f / w;
            sx *= invw;
            sy *= invw;

            int width = window.Width;
            int height = window.Height;

            float xt = width / 2;
            float yt = height / 2;

            xt += 0.5f * sx * width + 0.5f;
            yt -= 0.5f * sy * height + 0.5f;

            sx = xt;
            sy = yt;


            return new ScreenVector()
            {
                Result = true,
                X = sx,
                Y = sy
            };
        }