Statement: I have a 3D model ready in Google SketchUp Pro.
Problem Statement:
Question: How can this be done?
Note: I figured out VRML could be an option, but I was unable to get that idea up and running.
Have you investigated the Sketchup Web Exporter plugin (still in beta at time of writing)?
If that doesn't do exactly what you're after, you can write a plugin yourself using the Sketchup API, allowing you to write plugins in Ruby or C++.