[X3D-Public] Blender export to X3D shows blank black screen

[Ivan]

I used blender to export a complex architectural model to a X3D format, and
when I try to play it back on the browser, it shows a black screen instead
of my model.  An example of it is here:
http://ivanchanphotography.com/skytrain/

A simple model built using blender then exported to x3d didn't have the
same problem?  An example here is
http://ivanchanphotography.com/cerealbox/index2.html or
http://ivanchanphotography.com/shampoo


Anyone can try to help?
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