Great, practical replies, much appreciated.
Being someway short of being able to ‘try it and see’, more naive questions arise:
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would a created plane have to be precisely tailored to its perimeter, or could it be oversized, to kinda slide behind the perimeter elements that it meets and/or freestanding furniture? to continue uninterrupted behind that light fitting? or a multi-pane window could get a modelled single plane of glass which crashes through each glazing bar?
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how would a created plane be accurately located in space, when perimeter elements seem to be confused by adjacent unintelligible surface, even if well textured in themselves? Even an ideal perimeter element gets fuzzy where it meets a flat plastered surface, so does not show a reliable edge to which the new modelled surface can be aligned or even ‘snapped’ (in CAD).
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could the above be done in point cloud enabled vector-based CAD - AutoCad 2013+, Microstation etc that I’m familiar with, or only in amorphous shape-making pixel-based 3D software?
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as there’s a low limit to the number of scan stations per room, laser scanning leaves a great deal of detail uncaptured, compared with the multi-camera potential of photogrammetry. Esp in an inhabited room with lots of stuff - what do laser-scan surveyors do about that? Maybe demand that the room is emptied?!