Hi Laurent, VisAD uses: BoundingSphere(new Point3d(0.0,0.0,0.0), 2000000.0); Perhaps this is too small for your application. If you are changing the BoundingSphere, please try changing it to Double.MAX_VALUE. Does this make the problem go away? If so, we might make this the default in VisAD. We might try Double.POSITIVE_INFINITY, but I'd worry that some Java3D implementations might not like that. Thank you, Bill On Fri, 2 Sep 2005, Laurent BEIGBEDER wrote: > It seems to be strange: > > If the view is far from a shape, the ambient light reflexion is OK. > If the view is near the shape(zoom), the ambiant light is shown only when > another shape approaches. > Changing the boundingSphere radius change this behavior > I tried directx and opengl runtime, it did not change anything. > > It might be a weird behavior like u said!