/// <summary>
/// multiply matrix left and right
/// </summary>
/// <param name="left">left matrix</param>
/// <param name="right">right matrix</param>
/// <returns>multiply result of two matrixes </returns>
public static Matrix4 Multiply(Matrix4 left, Matrix4 right)
{
Matrix4 result = new Matrix4();
for (int i = 0; i < 4; i++)
{
for (int j = 0; j < 4; j++)
{
result[i, j] = left[i, 0] * right[0, j] + left[i, 1] * right[1, j]
+ left[i, 2] * right[2, j] + left[i, 3] * right[3, j];
}
}
return result;
}