问XNA 4.0中的三维炮塔跟踪

EN

///  position = my position, lookat = the position of the object I want to look at
public static Matrix LookAt(Vector3 position, Vector3 lookat)
{
    Matrix rotation = new Matrix();

    rotation.Forward = Vector3.Normalize(lookat - position);
    rotation.Right = Vector3.Normalize(Vector3.Cross(rotation.Forward, Vector3.Up));
    rotation.Up = Vector3.Normalize(Vector3.Cross(rotation.Right, rotation.Forward));

    return rotation;
}