[Therion] Joining surveys at a curved/sloping pitch

[Xavier Pennec]

Indeed, if the two scraps are joined, then using -outline out creates  a 
hole which is not colored.

The main problem in this configuration is that the bottom scrap should 
close its outline contour using the pit line rather than using an 
implicit line connecting the two shortest points where the contour is 
open. However, connecting the wall of the bottom scrap to the pit line 
does not solve the problem since the pit line should have outline out on 
the top scrap and outline in on the bottom scrap. The solution I used to 
patch that was to duplicate the geometry of the pit line of the top 
scrap into a "wall:invisible" line (inversely oriented to have the 
correct orientation) on the bottom scrap. When the two scarps are not 
deformed too differently, this works. But if the scraps are deformed 
differently, then the top and bottom lines are deformed independently 
and differently and this can create a small hole.

This is basically the same solution as the one Footleg just proposed. I 
wish there would be a more principled way of joining two scraps along a 
shared line.

Xavier


Le 10-May-19 à 14:31, Footleg a écrit :
> I do this sort of thing a lot. You just need an equivalent line in the 
> lower (blue) survey with -outline out to extend the blue scrap border 
> to cover the white hole in your plan. I generally use an invisible 
> wall line (so does not need '-outline out' option specifying) and make 
> it slightly larger than the curved pit line so the overlap of the 
> scraps is maintained even if a bit of distortion is applied due to 
> loop closure corrections. As long as the scraps are in the same map 
> level (i.e. not separated by a break) then the upper scrap will hide 
> the overlapping area of the lower one. You cannot 'join' the scraps 
> automatically now as neither will have an opening in the outline at 
> the pit now. So if you need to join them to keep them aligned you have 
> to specify the exact line points to join to pin the points at either 
> end of the curved lines to each other in the pair of scraps.
>
> Footleg
>
> On Fri, 10 May 2019 at 12:42, Tarquin Wilton-Jones via Therion 
> <therion at speleo.sk <mailto:therion at speleo.sk>> wrote:
>
>     Thanks for the reply.
>
>     > Adding the option -outline out to the (closed) line of your pit
>     on the
>     > top scrap should create the whole that you want in the blue color so
>     > that you will see the green color of the bottom scrap.
>
>     See attached for what happens when you do that. I need the blue to
>     fill
>     the blank area. Blue and green belong to different surveys, so getting
>     them to perfectly match the curve of each other manually is ... hard.
>
>     Is there a way to create a scrap within the green survey (where it is
>     easy to perfectly follow the same line), but tell it to take it's
>     altitude colour from the blue scrap instead?
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-- 
> -------------------------
> Xavier Pennec
> Senior Research Scientist / Directeur de recherche
> Asclepios project-team, INRIA Sophia-Antipolis
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> F-06902 Sophia-Antipolis Cedex, France
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