On 20/12/2019 20:58, Tarquin Wilton-Jones via Therion wrote: >> If extend algorithm follows stations in order 1 - 2 - 3 - 4 - 5 - 6 - 7 >> - 8 - 9 and you specify >> extend vertical 3 >> extend right 8 >> Then stations 3,4,5,6,7 should be placed vertical and 8,9 on the right. >> I have tested it and in my example, it works like this. > > In the case of what you said, I would have expected the following legs > to be default (right): > > 1-2 > 2-3 > > the following legs to be vertical: > > 3-4 > 4-5 > 5-6 > 6-7 > 7-8 > > then the following legs to be right: > > 8-9 > > Instead, leg 2-3 will be vertical, and leg 7-8 will be right. > > At least in my head, "extend vertical 3" feels like it should mean > "everything from station 3 onwards". I think Bruce also expected this, > given what he wrote in the wiki "extend" article: > https://therion.speleo.sk/wiki/extend > "Usually this option will not work as described, unless it is preceded > by one or two extend right <leg> statements." > > So perhaps this is either a generic misunderstanding; Therion assumes > that by <station> it means <the leg that goes *to* the station>. We > assume that by <station> it should be <the legs that come *after* this > station>. > > I don't know which of those is right. I have also never used this with > Survex, so I don't know if Survex agrees with Therion - Perhaps Wookey > can say?
Survex agrees with me. Therion does not.
1 2 20 0 -80
2 3 5 62 -10
3 4 5 12 -15
4 5 5 132 17
5 6 5 18 -15
6 7 5 201 -7
7 8 5 63 -10
8 9 20 0 -80
9 10 5 15 -45
10 11 5 357 -30
11 12 5 27 -25
12 13 5 290 -18
13 14 5 323 -22
14 15 5 300 -7
15 16 5 15 -35
16 17 5 337 -42
17 18 5 281 -38
18 19 5 225 -20
19 20 20 0 -80
Therion:
extend start 1
extend left 3
extend right 8
export map -proj extended -o "somepitches.pdf"
Survex specfile:
*start somepitches.1
*eleft somepitches.3
*eright somepitches.8
extend.exe --specfile=extend.svx somepitches.3d somepitches_extended.3d
I have attached the two outputs. You can see that they are not the same.
somepitches.pdf
Description: Adobe PDF document
somepitches_extended.3d
Description: Binary data
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