riggingtopos

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riggingtopos [2019/12/02 13:06]
tarquinwj article links
riggingtopos [2019/12/24 19:26] (current)
tarquinwj Ladder
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 This article is based on the traditional rigging topo approaches and styles used in the UK. However, it is likely be to very similar to approaches used elsewhere, and the approaches can be adapted. The symbols used here were almost entirely made especially for the purpose of making rigging topos. The sample rendering shows a series of both explicit naturals (stalagmites, colums, flakes, boulders, trees, stakes, bars) and symbolic naturals (circle), explicit P-hangers and implicit hanger dots: This article is based on the traditional rigging topo approaches and styles used in the UK. However, it is likely be to very similar to approaches used elsewhere, and the approaches can be adapted. The symbols used here were almost entirely made especially for the purpose of making rigging topos. The sample rendering shows a series of both explicit naturals (stalagmites, colums, flakes, boulders, trees, stakes, bars) and symbolic naturals (circle), explicit P-hangers and implicit hanger dots:
  
-{{ ::topo.png?nolink |}}+{{ :topo.png?nolink |}}
  
 Rigging topos (rigging diagrams) would usually start their life as a projected elevation (see the [[https://therion.speleo.sk/downloads/thbook.pdf|Therion book]] and the [[extend|Extended Elevations]] article for details). The walls can be drawn with regular wall lines. The surface can be drawn with whatever lines are appropriate (the example shows wall lines with "-subtype sand -outline none -clip off"), with linepoints to connect stakes and trees. Rigging topos (rigging diagrams) would usually start their life as a projected elevation (see the [[https://therion.speleo.sk/downloads/thbook.pdf|Therion book]] and the [[extend|Extended Elevations]] article for details). The walls can be drawn with regular wall lines. The surface can be drawn with whatever lines are appropriate (the example shows wall lines with "-subtype sand -outline none -clip off"), with linepoints to connect stakes and trees.
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 The rope lengths are made with [[metapost#Rope lengths|Rope lengths]] points. The rope lengths are made with [[metapost#Rope lengths|Rope lengths]] points.
 +
 +The ladder is made from the standard Therion "fixed ladder" line. Although Therion has a "rope ladder" line as well, which seems to be the right symbol for a portable ladder that you rig for yourself, it does not have an actual definition so it does not work at the time of writing.
 +====Shortening long passages====
 +
 +Rigging topos will typically concentrate only on the parts of the cave that need ropes, with only enough passage either side to identify the location. Long passages between pitches are normally shortened with a break symbol to indicate that the passage is longer than shown.
 +
 +With Therion, this can be achieved in a few ways, but the easiest for horizontal passages is as follows:
 +
 +Start with the extended elevation, with the "extend start" and "extend right" (or left) set as needed at the top of the first pitch. On reaching the first passage that needs to be shortened, allow one survey leg to continue into the passage. Then from the next leg, set all legs to "extend vertical". This causes them to take up no horizontal space. Continue until one leg before the next pitch. Then set that leg onwards to "extend right" (or left) again. Export this as an XVI, create a new th2 file for it, insert the XVI image, draw your extended elevation scraps around it. Potentially, you could even draw this as one scrap.
 +
 +  extend start 1
 +  extend right 1
 +  extend vertical 6 7
 +  extend vertical 7
 +  extend right 22 23
 +  extend right 23
 +
 +Use the [[metapost#Break line|break line]] over the passage (with "-subtype break -clip off -place top" options) to indicate that it is longer than shown (usually used for passages that keep their dimensions fairly constant). Alternatively, draw it as two unconnected scraps, with a break line at each of the ends facing towards each other (usually used for passages that have dramatically changed size).
 +
 +For passages that lose vertical height over the unwanted length (or if you just don't want to use the "extend vertical" approach), this is still fairly easy. It doesn't matter whether you have used "extend vertical" on the extended elevation or not. Create the scraps for each pitch. (You do not need to create scraps for the passages that you do not want to include.) The simplest way to combine these into a final PDF is to create a "map" for each scrap (or each group of scraps that can be treated the same as each other). Create a parent map containing those child maps. In that parent map, use offsets with "none" as their preview setting, to pull the maps of the pitches into the desired location.
 +
 +  map toppitches_map -projection extended
 +    pitch1_scrap
 +    pitch2_scrap
 +  endmap
 +  map bottompitches_map -projection extended
 +    pitch3_scrap
 +  endmap
 +  map topo_map -projection extended
 +    toppitches_map
 +    bottompitches_map [-30 107 m] none
 +  endmap
 +
 +When you export that parent map (topo_map in the demo) as an extended elevation, it will position them in the chosen positions.
 +
 +Alternatively, you can just select each pitch map in turn (toppitches_map and bottompitches_map in the example), and export them as PDFs. Then create a new PDF export that uses "map-image" to import each of those PDFs in turn, positioned where you want them in the resulting PDF.
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