[Therion] Troubles with the 3D generation

[Martin Sluka]

> 20. 3. 2017 v 20:48, Benedikt Hallinger via Therion <therion at speleo.sk>:
> 
> What is the different between "point dimensions" and "point passage-height"?
> 
> If i understand the therion book correctly:
> - dimensions is ONLY for the 3D-tube generation and invisible in rendered maps
> - otherwise behaves as if "point passage-height [+<up> -<down>] would have been given.
> 

point dimension: use -value option to specify passage dimensions above/below centerline plane used while creating 3D model.

• value ◃ value of height, passage-height or altitude label or point dimensions height: according to the sign of the value (positive, negative or unsigned), this type of symbol represents chimney height, pit depth or step height in general. The numeric value can be optionally followed by ‘?’, if the value is presumed and units can be added (e.g. -value [40? ft]).
passage-height: the following four forms of value are supported: +<number> (the height of the ceiling), -<number> (the depth of the floor or water depth), <number> (the distance between floor and ceiling) and [+<number> -<number>] (the distance to ceiling and distance to floor).
altitude: the value specified is the altitude difference from the nearest station. If the altitude value is prefixed by “fix” (e.g. -value [fix 1300]), this value is used as an absolute altitude. The value can optionally be followed by length units.
dimensions: -value [<above> <below> [<units>]] specifies passage dimensions above/below centerline plane used in 3D model.

A bit difficult to understand. I understand passage-height [+8 -3] From water level to ceiling 8 m, depth of water 3 m.

But what it means:  "-<number> (the depth of the floor" or "[+<number> -<number>] (the distance to ceiling and distance to floor)"? Has floor any depth? Or it means the situation if the point „height“ is on edge of step or pit?

m.s.