[away3d] PB Shaded Head Demo by David Lenaerts & Fabrice - Ambient problem

[MarkC]

I have complied http://derschmale.com/demo/away3d/shadedHead/ for
Away3D 3.6 current SVN (converting Number3D and MatrixAway3D to native
Vector3D and Matrix3D as usual), but the ambient light does not work.
I cannot see why, any ideas?