[Therion] Lox Model showing walls from wrong side

[Andrew Atkinson]

I've branched this from  Converting Inkscape Drawings of very large 
caves	intoTherion:

I have experienced the stretch using 2 points, and where I have tried 
this is always solved by adding more points and scraps were needed, but 
the inside out part I do get more often. I have tried splitting into 
more scraps, and splitting the lines.

The former works totally or reduces the incorrect bit, however a side 
affect is that the model is not as neat as it should be as the lox model 
has a 'step' on the scrap join. As demonstrated by the 2 attached set of 
files.

But currently all this is a bit random, and the moving to a new scrap is 
very tedious, it would be good to have some understanding of the 
problems, so they could be avoided?

Andrew


On 24/02/11 18:47, Bruce wrote:
 >>Simple scrap, but why does my lox model appear to only show the walls
 > when seen from the wrong side?
 >
 >>I have checked that the wall lines all have the yellow tick pointing
 > inside the passage. But half my passage appears in the Loch viewer to
 > only show the wall from the inside face, not from outside the model.
 >
 >>Very simple data file contents are as follows. The survey stations are
 > being imported from a survex 3D file. But I am only using 2 survey
 > points to scale the scrap, so you should be able to create any two
 > points to substitute the survey data.
 >
 >   I have done this with scanned paper files a number of times.
 >
 > Always if I use two points the lox files come out as you describe, or
 > with vertical extensions from the actual cave position to the surface.
 >
 > A solution that has worked once, but not tested yet on the others is two
 > break the drawing into more than one scrap, and have at least two points
 > per scrap.  This way the therion drawings and lox come out the same as
 > with a conventional survey.
 >
 > It seems that two points, one scrap is too minimalist for the current
 > implementation.
 >
 > Bruce
 >
 >
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