What resources exist for designing virtual reality experiences?

Question

I'd like to read some resources on VR. Interests include:

• Major 'no-nos' for immersive experiences;
• Design patterns for VR
• Case studies of VR products
• Hidden difficulties with the practicality of creating VR experiences (e.g. moving from 2D assets to 3D)
• How to user test an immersive product
• Usability heuristics for 3D
• Relevant materials from 3D game design
• Where to find academic research or university project writeups
• Openly available VR products to use as benchmarks
• 3D space design guidelines in general

VR is pretty cutting edge, so imagine most of the resources are quite piecemeal, or hidden behind paywalls. That's okay! I'm a patient reader. I'd just like to know if others have discovered anything interesting.

Answer 1

I've tried to make this list as non-platform-specific as possible. Keep in mind that any of these links may have a degree of bias towards certain VR headsets, 3D engines, or techniques.

• Usability and Motion Sickness
• Things to Consider when Creating Content
• Oculus Best Practices (Applies to non-Oculus headsets)
• VR Design Practices (Specifically "Contextual Reticle" section)

Answer 2

Some thorough guidelines that I can think of right now are:

• Google's guidelines, split up between their VR app and their written guidelines
• Oculus's best practices write-up
• Intel's UI guidelines
• LeapMotion's VR design guide

Other than that, there are lots of articles, videos, and other bite-sized resources online—a good repository of those is at uxofvr.com, as recommended by Utsav above.