> One last question. If I wanted to try a projected elevation (to remove the extra complexity of the extending process) how do I specify the projection angle?
> An angle seems to be a parameter in a scrap '-proj elevation' definition, but what determines what angle the _centreline_ is viewed from?
> I cannot specify an angle in the top level 'export map' command:
> export map -proj elevation -layout local -o "elv.pdf"
Wookey
All the projected elevation objects (scraps, maps and exports) need to have the projection angle specified. Specifying nothing will result in a projection looking at bearing zero (north).
ie export map -proj [elevation 042 deg] -layout local -o "elv.pdf"
or export map -proj [elevation 042] -layout local -o "elv.pdf". Therion defaults to degrees I think.
In XTherion it is like this…

Therefore if using degrees, you have the option of drawing up to 360 unique projected elevations.
Bruce