Re: Any ideas how to fix problem when running genapts?

Hi,

Marc Frajola wrote:
> I'm seeing the following error when I run genapts:
> 
> Internal error in segmentintersection():
>   Topological inconsistency after splitting a segment.
>   Please report this bug to [email protected]
>   Include the message above, your input data set, and the exact
>     command line you used to run Triangle.

I can't tell you about the actual origin of that error message. However,
I think there is a "nudge"-option documented somewhere in the
genapts-README. Try that with a small value to "nudge" the geometry a
bit. Maybe this helps.

> I took the CVS snapshot of terragear source as of July 1 2006. The OS
> I'm using is FreeBSD 6.0-RELEASE. I have GPC and newmat installed, and
> have removed -O2 optimization from the TriangleJRS directory and
> applied a patch to SimGear's newbucket.hxx as recommended by:
> 
> http://wiki.flightgear.org/flightgear_wiki/index.php?title=Building_Terragear
> 
> FYI, I have FlightGear 0.9.10 and SimGear 0.3.10 installed and working.
> 
> The invocation I used for genapts (using extracted DEM-30 data) was:
> 
> $ genapts --input=apt.dat.gz --work=../../work/ --min-lon=-100 --max-lon=-80 --min-lat=30 --max-lat=40
> 

Looks reasonable, although it seems to cover a very wide area. Keep in
mind that you'll also need the landcover data (towns, roads, rivers,
etc.) for the area you want to build. Maybe Martin Spott can help you
out by extracting some shapefiles from his terrain database for your
specific area.

> Has anybody tried putting together a script that does a complete
> scenery build from scratch? If so, I could perhaps use such a script to
> partition my problem to a potentially incorrect build versus something
> I might not have done quite right during extraction/setup of the data
> files before running genapts.

You may want to have a look at my builder-script, which you can fetch at
ftp://ftp.ihg.uni-duisburg.de/FlightGear/Misc_rag/new_builder-current.tar.gz

It's a perl script which should do everything that is needed to prepare
and build scenery. It's not yet finished as in "it does not yet have all
I want it to have", but it works. I'm applying it regularly.

> I am willing to switch to using cygwin, if anybody has been successful
> generating scenery with terragear on windows using cygwin. I have also
> accumulated a list of things which I had do different from the
> published procedure to get terragear to build on FreeBSD.

I think, Martin Spott is possibly greatly interested in your procedure,
and so am I. In the same directory as the scenery builder you can find a
build skeleton for building FlightGear, TerraGear and other related tools:

ftp://ftp.ihg.uni-duisburg.de/FlightGear/Misc_rag/fgfs-builder-current.tar.gz

I'd love to extend it and make it more foolproof so maybe you want to
have a look at that and perhaps we can find out how to extend this
towards FreeBSD.

Going towards cygwin is a step I'd hardly suspect to be of great help,
to say the least. I have tried building TerraGear for cygwin and it was
a mess even worse than the process on Debian GNU/Linux.

> If anybody has been successful building scenery using the current code
> from CVS, it would be very helpful to see even a command line history
> dump of the commands you ran to successfully produce any scenery tiles.

I'm using top-notch latest CVS of TerraGear all the time with my
build-script and the additional patches in the build skeleton, and it works.

Hope this helps,
Ralf

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