Henry There are subtleties associated with the choice between using walls and lines with -outline set, that go beyond appearance and internal passage shading.
This from https://therion.speleo.sk/wiki/drawingchecklist Walls <https://therion.speleo.sk/wiki/drawingchecklist#wall> (and lines with -outline in/out) define the outline of the scrap. Walls are just a special type of <https://therion.speleo.sk/wiki/drawingchecklist#lines> line that; * has the option '-outline out' set by default, * clips many symbols that typically only appear inside the cave passage (unless '-outline none' is set), * have their own special subtypes, and altitude labelling, that are not available to other lines, * are used by the scrap join algorithm to decide which line ends to join (for visible wall lines only), * define the shape of previewed (above and below) scrap outlines (other linetypes with -outline set to in or out do not do this <unfortunately>). Like Martin, my preference for surface bluffs and similar features, after experimenting some years ago, is to use… line wall:pit -outline none -clip off (I think the second bullet point statement above, in parentheses is incorrect, maybe should read – unless ‘-clip off’ is set) If I wanted a different appearance to line wall:pit, I would probably redefine the symbol for wall:pit rather than use a non-wall linetype, so that I can retain the scrap joining and preview characteristics of walls. Bruce From: Therion [mailto:[email protected]] On Behalf Of Martin Sluka via Therion Sent: Tuesday, 14 February 2017 11:55 PM To: List for Therion users <[email protected]> Cc: Martin Sluka <[email protected]> Subject: Re: [Therion] Surface or Canyon walls It is from AUT symbol set: Better idea is "-outline none -clip off" option, because it is surface morphology, not a part of an underground cavity. m.s.
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