[Therion] Entering survey sketch without walls

[Bill Gee]

I gave this a try ...  I drew partial pillars on the edge of each scrap 
using a normal wall line.  I changed the straight lines between the 
pillars to -visibility off, and I added a "join scrap1 scrap2 -count 2" 
to the .th file.  The result is not quite as badly mangled, but it is 
still not right.

Taking out the join statement gives a map that makes more sense.  There 
are still some artifacts where the two scraps join, and the walls on the 
pillar between those two scraps don't line up quite right.

I also tried it using "join scrap1 scrap2" and no -count option.  That 
produced a reasonable map.  The wall on the east side now has a smooth 
join.  The pillar in the middle still has discontinuities.

I checked the "reverse" box on the pillars which are completely 
contained in a scrap.  It made no difference I can see.  When I drew 
those lines, I went in a counter-clockwise direction.

On the upper scrap I drew lines between the pillars.  I did not draw 
those same lines on the lower scrap.  Is that needed?

One thing that is very apparent here is that the in-cave survey and 
sketching will have to be done exactly right.

Two attached PDF files, one with the "join count 2" statement and the 
other with no join statement.

===============
Bill Gee

On 12/5/24 13:19, Bruce Mutton wrote:
>> If I draw only that part of the column which is in each scrap, can I still use "-outline in"?
> No, those remain -outline out.
> Also your sketches for surveys should not include the parts of the pillar walls that have not been surveyed!
> 
>> Will I need to use line joins to get the two parts of the column to come together?
> No, use join scrap1 scrap2 -count 2
> And you will need to replace line wall -subtype invisible with line wall -visibility off as is intimated in https://therion.speleo.sk/wiki/drawingchecklist#wall
> 
>> And will that result in a column that is entirely white on the inside?
> Yes, but only once you have all wall lines in place and parameters for all lines correct (-reverse, -outline, -subtype, -visibility)
> 
> Bruce
> 
> 
> 
> 
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