extend

Name

extend -- produce an extended elevation from a .3d file

Synopsis

extend { input .3d file} [output .3d file]

Description

Extend starts with the highest station marked as an entrance which has at least one underground survey leg attached to it. If there are no such stations, the highest deadend station in the survey (or the highest station if there are no deadends) is used. Extend puts the first station on the left, then folds each leg out individually to the right, breaking loops arbitrarily (usually at junctions).

This approach suffices for simple caves or sections of cave. for more complicated situations human intervention is required - try Chasm's extended elevation editor (which we plan to integrate into Survex in the future).

If the output filename is not specified, extend writes its output to extend.3d.