Apply a rotation transformation to this matrix that rotates the given normalized <code>fromDir</code> direction vector
to point along the normalized <code>toDir</code>.
<p>
If <code>M</code> is <code>this</code> matrix and <code>R</code> the rotation matrix,
then the new matrix will be <code>M * R</code>. So when transforming a
vector <code>v</code> with the new matrix by using <code>M * R * v</code>, the rotation will be applied first!
@param fromDir
the normalized direction which should be rotate to point along <code>toDir</code>
@param toDir
the normalized destination direction
@return this
Apply a rotation transformation to this matrix that rotates the given normalized <code>fromDir</code> direction vector to point along the normalized <code>toDir</code>. <p> If <code>M</code> is <code>this</code> matrix and <code>R</code> the rotation matrix, then the new matrix will be <code>M * R</code>. So when transforming a vector <code>v</code> with the new matrix by using <code>M * R * v</code>, the rotation will be applied first!
@param fromDir the normalized direction which should be rotate to point along <code>toDir</code> @param toDir the normalized destination direction @return this