In my city engine scene I make rooftops transparent in order to see into the buildings from the top. When I export to a web scene, the rooftops in web viewer are solid. How can I make the web scene observe the transparency?
There are no textures. I imported a shapefile of building footprints, extruded into 3D, and set the top to be transparent using the simple CGA rule I pasted above. Attached are pictures. The .cej shows a transparent roof. When I export to 3ws or collada the roof becomes solid.