Charlie - are you still into 3d web? Here's a post from Lullabot, the hugely successful Drupal consultancy, that hints at a Drupal (Backdrop) support for VR:
https://www.lullabot.com/blog/article/cutting-edge-web-vr
At first I'd dismissed it as "another animated mailbox trick," but after reading the post, I am intrigued to try things out on my own!
-Bronius
-- from the cloud