public virtual Matrix44Adaptor SetRotate(UnitVectorAdaptor fromDirection
, UnitVectorAdaptor toDirection, PointAdaptor basePoint)
{
Debug.Assert(fromDirection != null && toDirection != null
&& basePoint != null);
if (!(fromDirection != null && toDirection != null
&& basePoint != null)) return this;
double angle = fromDirection.AngleTo(toDirection);
VectorAdaptor axis = fromDirection.VectorAdaptor.Cross(toDirection.VectorAdaptor);
SetRotate(angle, axis.UnitVectorAdaptor, basePoint);
return this;
}