thanks a lot for this information. i'm using android. however, i opened your file on windows. in that case, i'm using Firefox. it seemed like the adobe reader wasn't really needed anymore. at least over a decade ago. i guess they added 3d pdf. which i didn't know about. so learned something new.
The transparent glass was done in Acrobat 9 Pro Ext., it allows you to pick individual objects and specify solid, solid outline, transparent, solid wire frame, illustration, shaded illustration etc.