Great work! When finished, it will certainly help a lot of people. OK, my remarks:
You can add other specification lines to your centerline data. In fact, you should specify (at least) date, declination, team members and data
Declination can be entered also for entire survey (all centerlines in it) - and it can depend on date. At least, we use it this way more often.
source template.th
layout xvi-export scale 1 1000 grid top grid-size 1 1 1 m endlayout
"grid top" line is not necessary. Currently this is ignored and grid is created all the time on the bottom.
"Background image" panel control is the "Drawing area" panel control. You can press the "Auto adjust" button so canvas dimensions adapt to .xvi image automatically. Click on rectangle next to "Zoom 100%" to
"Auto adjust" should be now called automatically - when new background image is inserted.
Passage-height points are important because 3D model are build according to them. Insert a point where passage-height is known. Then select "passage-height" from point's type menu. In the options textbox, write:
value <number> <number>
Where first <number> is distance to ceiling and second one is dastance to floor.
This is a BUG in therion-book - I am sorry. First number should mean height above water level and the second depth of water. I have seen this symbol only in this context of water level - never in the context of ceiling/floor specification. To add specification of UP/DOWN dimensions in the 2D map for 3D model, we have point type dimensions in the TODO list. Regards, S.