If you only see a bunch of static images and nothing happens when you click them, this might be the reason.
On Firefox for Android, I'm able to interact with it and rotate it with full 360° range of motion.
To my eyes however, there's much better stuff on the rest of that repository:
Comics have always been a easy low cost way for artists or even people with just idea's to communicate their ideas.
For an extreme example of this
Where the ideas are amazing, but he uses the same few cells for ALL of the comics.
This comes from someone who has worked with 3D content for years, and I see mesh based 3D as the Ultimate machine in handing power to people with money.
It's pretty cool, I wish more of them worked on my computer. The reflective/translucent ones all appeared as black or the models didn't load at all.
Another problem (for VR) is that current VR systems don't deal well with thin lines. You really want to avoid aliasing (crawlies) for high-quality VR.
Would love to see something like Paperman implemented in real-time:
I'd love to recreate something like this in a 2d canvas.
There isn't proper occlusion but I fake it by applying a different style to edges that are facing away from the camera. You could also do like the OP and draw white polygons in the space between lines.
Have a look here https://jsfiddle.net/cyt0o7m9/
I'm no artist, but I did manage to whip something up to test the concept: https://twitter.com/Zikes/status/769433398217629696
They do leverage OpenGL - so maybe that's the problem?
Many of them were automatically generated, but some comics were manually converted (by xkcd fans!). You can browse them from the 3d.xkcd.com site.