How do i create a rotation matrix given a direction vector?

I am 开发者_开发技巧trying to rotate an object to face the direction it is moving in. We want it to face the normalized velocity vector.. help... pls...

Have you tried Matrix.CreateLookAt (MSDN)?

// Matrix.CreateLookAt(eyeLocation, lookAt, upVector); 
Matrix.CreateLookAt(currentPosition, currentPosition + velocity, Vector.Up);