hey, just wanted to let you know, the new v37 update for the quest 2 has a new (experimental) integrated "define room" mechanic for passthrough. it seems to be a lot better than the defining feature you are using... maybe look into it? ;)
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i think its tied to the stationary setting and doesnt use the guardian limitations at all... i only saw it presented in a youtube video though... but the way i understood it, you could save the measurements for several rooms AND even add things like couches etc inside those rooms. below is the video: