andrewmcleod
Well-known member
*In theory* you can always go from extended to projected if you have a centerline, whereas a projected elevation cannot be reliably extended. The software to actually do this for some input format e.g. th2 does not exist AFAIK. I think there is a way of getting Therion to output a projected version of an extended elevation but you don't get the drawing (forgotten how exactly).
Converting an extended th2 to a projected th2 in combination with the centerline, however, *should* be a relatively straightforward transformation for a programmer with a bit of time and nothing better to do. For someone who is happy to split bezier curves at arbitrary points and then reproject them as required, that is (I did think about this a bit more in the past).
For a cave with a one or small number of main descending routes that twist and turn, projected is horrible IMO. But for a complex system with a dominant axis, projected is certainly less horrible than hundreds of broken connections.
Converting an extended th2 to a projected th2 in combination with the centerline, however, *should* be a relatively straightforward transformation for a programmer with a bit of time and nothing better to do. For someone who is happy to split bezier curves at arbitrary points and then reproject them as required, that is (I did think about this a bit more in the past).
For a cave with a one or small number of main descending routes that twist and turn, projected is horrible IMO. But for a complex system with a dominant axis, projected is certainly less horrible than hundreds of broken connections.