[Therion] Entering survey sketch without walls

[Tarquin Wilton-Jones]

> For this case, though, that will not work.  There are no passages in 
> this mine.  Think of a large room in a building with support columns in 
> the middle.


You have to change your mindset. It *is* a series of passages. They are 
just very short before reaching the next junction. And just like if you 
were surveying a cave passage 100 metres wide and 50 metres long, you 
have to draw the walls, and close the gaps between them with an outline. 
See attached (case 3).
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