[Therion] How to generate a projected elevation along aspecificbearing?

[Bruce]

OK, a few routine syntactical things to sort out here, no bugs. 

Firstly to help debug I showed the centerline and added debug all to the
layout.  Then I could see what was going on.

It was apparent that with no projection orientation the elevation scraps
were screwed up (upside down).  Try it with the original file set Footleg
sent, you will see.  This is expected behaviour with a scrap drawn in one
orientation and then morphed to another.

 

Second I pulled the map object definitions outside of the survey structure
in the th file.  Not sure if this was a problem, it's just the way I've
found works best for me.

 

Third the definitions of the elevation all need to match.  Remember that if
we are using integer orientations there are 359 possible elevation types,
and if anywhere it is undefined it defaults to 'north'.  This was the main
problem here.

 

In the attached you will see I have added;

-projection [elevation 090 deg] 

To all of the elevation scraps, the elevation map definition in the th file
and the export elevation statement in the thconfig.

 

Hope this helps.  I guess the Therion Book and the wiki could have a bit
more on this.  Drawing elevations is one of the very basic functions after
all.

 

Cheers

Bruce

 

  _____  

From: therion-bounces at speleo.sk [mailto:therion-bounces at speleo.sk] On Behalf
Of Footleg
Sent: Tuesday, 22 March 2011 11:39 p.m.
To: List for Therion users
Subject: Re: [Therion] How to generate a projected elevation along
aspecificbearing?

 

This is a small learning project, so I've attached all the files apart from
the bitmaps.

I think there is a bug lurking behind these problems. I am using Therion
build 5.3.6 on Windows. I tried adding a projection direction of 090 to both
the scraps in my elevations th2 file, even though only one of these scraps
was included in the map in the th file at the time. This caused a long list
of errors when trying to generate the elevation pdf. So I removed the 090
from after the word 'elevation' in the projection box for both scraps.
Including the second scrap in the map block with no projection direction
declared now results in what looks like the output for the first scrap
duplicated in the elevation pdf with both 0 and 90 projections. Hopefully
you can easily reproduce these problems with the attached files. I've left
both scraps included in the map for the elevation. But you can comment out
the 2nd one and then try to set a projection direction of 090 on both scraps
in the th2 file and get the errors. Why does changing the projection
direction for the second scrap cause the pdf generation to fail even if that
scrap is not used in the pdf?

Footleg



On 21 March 2011 19:27, Bruce <dangle at tomo.co.nz> wrote:

Footleg

May need to include your th and th2 files to be more specific.

 

Couple of likely issues.

1.	Firstly check that the direction of the projection is the direction
in which you are looking.  Ie on the elevation the direction will then be
'into the page'.  If you don't specify a direction then Therion assumes it
is north.  I would guess you have some scraps/maps with differing projection
directions, and so naturally they are different projections.  If you have
for example 3 different projection directions, then therion will make three
elevations (if you ask to export them).  Look in the log file or Xtherion
compiler map structure pane for clues.
2.	Make sure every scrap and map you want to include in this elevation
has the same projection.  Many versions ago I found that Therion assumes 0
is not the same as 000 and 20 is not the same as 020.  So I always use 3
digit integers these days.
3.	Differing coordinate systems.  If you for example use a different
thconfig for the main map production and test plots of parts of the cave you
might be using different coordinate systems or declinations each time.  This
will really screw up the elevations where passage is almost in the same
direction as the projection, because Therion will morph as much as required.
In this situation it often turns into a real mess.

 

Bruce

 

  _____  

From: therion-bounces at speleo.sk [mailto:therion-bounces at speleo.sk] On Behalf
Of Footleg
Sent: Tuesday, 22 March 2011 2:59 a.m.
To: List for Therion users
Subject: [Therion] How to generate a projected elevation along a
specificbearing?

 

I've tried searching the wiki and Therion book to find an answer to this,
but it does not seem to feature anywhere. Not even in any examples I can
find. I am trying to draw a simple cave with a 20m vertical entrance shaft,
and a couple of chambers down a slope at the bottom. I've drawn an elevation
scrap for one of these chambers and the shaft. But when I generate an
elevation map using this scrap the shaft looks fine, but the chamber wall is
a mess. So I concluded it is not projecting the elevation along the bearing
I would like. The Therion book showed me I can put a bearing on the scrap
type. So I tried elevation 90. Now my shaft is no longer appearing anywhere
near vertical in the elevation PDF and the chamber. Can anyone help me
please?

Screenshot of scrap, and pdfs with default elevation map and elevation 90
settings attached.

Footleg


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