// Vector4‚ΖMatrix‚̏ζŽZ
        // i”Šw“I‚ȍs—ρ‚̏ζŽZ‚ΖˆΩ‚Θ‚ιj
        private Vector4 multiplyVector4Matrix(Vector4 v, Matrix m)
        {
            // Šes‚Μ“ΰΟ‚π‹‚ί‚ι
            Vector4 m1 = new Vector4(m.M11, m.M12, m.M13, m.M14);
            Vector4 m2 = new Vector4(m.M21, m.M22, m.M23, m.M24);
            Vector4 m3 = new Vector4(m.M31, m.M32, m.M33, m.M34);
            Vector4 m4 = new Vector4(m.M41, m.M42, m.M43, m.M44);
            Vector4 dot;
            dot.X = Vector4.Dot(m1, m1);
            dot.Y = Vector4.Dot(m2, m2);
            dot.Z = Vector4.Dot(m3, m3);
            dot.W = Vector4.Dot(m4, m4);

            // ¬•ͺ–ˆ‚̏ζŽZ
            Vector4 val;
            val.X = v.X * dot.X;
            val.Y = v.Y * dot.Y;
            val.Z = v.Z * dot.Z;
            val.W = v.W * dot.W;

            return val;
        }