> 20. 3. 2017 v 20:48, Benedikt Hallinger via Therion <[email protected]>:
> 
> 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.
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