Set this quaternion to be a representation of the rotational component of the given matrix.
<p>
This method assumes that the first three columns of the upper left 3x3 submatrix are unit vectors.
@param mat
the matrix whose rotational component is used to set this quaternion
@return this
Set this quaternion to be a representation of the rotational component of the given matrix. <p> This method assumes that the first three columns of the upper left 3x3 submatrix are unit vectors.
@param mat the matrix whose rotational component is used to set this quaternion @return this