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I was just imagining it would be neat to find 3D areas: go upstairs, down a hall, downstairs, and have it compute the volume of the 3D area.

The barometers available on devices would allow this to happen, but I don't know (don't think) that when you request location access via the browser it returns altitude information if the device supports it.

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I see. This is indeed harder. I don't think there is any web API for accessing these sensors.

Moreover, measuring the volume would require tracing out a much more complicated path since volumes are bounded by surfaces rather than edges. Given that the technical problems were solved, do you think that a human actually could manage to trace out a volume in an other cases than simple rectangular blocks etc?

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