Prevent user from looking through textures and moving in SteamVR play area

Good day!

Here is a little intro.
I’m creating vr experience, where user will be climbing on skyscraper.

Question is next:
How to prevent user from moving in steamvr play area and allow only head rotation, but prevent him to look through textures?

Setup is next.
Unity 5.5.2f1
SteamVR Plugin
HTC Vive HMD.

Thanks in advance!

Did you ever figure out the answers to your questions? I would like to know the answer as well if you wouldn’t mind sharing. On a side note how did you implement climbing? I have some climbing in my game but I’m having issues with it. Thanks.