Hi Peter,

Any news on the topic of the "gray" polygons ? I have been experimenting more 
with this,
and I can confirm that it occurs only when clipper is enabled.

If this can help, I have isolated a simple dataset (much simpler than last 
time) that
triggers the bug. It is just one landmass polygon with a handful of vertices. 
This data
is here: http://www.mguillaud.net/fg/2794338/2794338.tgz
(I also include the fitted elevation, since I don't know if this data interacts 
with the
bug). The bug occurs with fgfs-construct built from the code in papillon's 
tg850 branch
(i.e. with clipper), with or without my attempts at adjusting the epsilon 
constants that
can be found here and there in the code.

I run "fgfs-construct --work-dir=[..] --output-dir=[...] --tile-id=2794338   
SRTM-3
Landmass ", and the gray area is around -9.40025/51.5005 degrees.

Any insight on this issue is appreciated...
Maxime



On Sat, 12 Nov 2011 21:52:56 -0500
Peter Sadrozinski <psadrozin...@gmail.com> wrote:
> I have verified that the problem lies in using clipper.
> Using the same simple data with GPC works.  It appears clipper can
> sometimes produce clockwise winded polys.
> 
> I'm working on a fix now.
> 
> Pete
> 
> On Sat, Nov 12, 2011 at 7:59 PM, Peter Sadrozinski
> <psadrozin...@gmail.com>wrote:
> 
> > Hi Martin,
> >
> > I've been reluctant to move to the official repository mostly because of
> > very little understanding of GIT.
> > I'm a bit more confident, now, so I don't see it as a big problem.
> >
> > I think most of the work we are doing (alternate clipping library, 850
> > format) should be considered experimental, however.  I'm pretty sure we
> > want to keep the main branch
> > concentrated on fixing problems with detailed landclass.
> >
> > We seem to be breaking terragear pretty good as of late :)
> >
> > Maxime: I have an experiment for you to try - could you take the UFO under
> > those grey sections of scenery, and look up at them?  I think the normals
> > have swapped.
> > Chris mentioned this happening with the skirt around the airport, and I
> > hadn't seen it until a recent update.  Looks like something broke recently.
> >
> > Pete
> >
> >
> >
> >
> > On Sat, Nov 12, 2011 at 2:38 PM, Martin Spott <martin.sp...@mgras.net>wrote:
> >
> >> Hi Maxime and others,
> >>
> >> Maxime Guillaud wrote:
> >>
> >> > You can find my code here [...]
> >>
> >> I'm just starting to recover from a couple of _really_ tight days
> >> (including a nice PostgreSQL conference "PGConf.DE" where I gave a talk
> >> about our geodata collection and in-database processing), therefore I'm
> >> not yet ready to provide comprehensive responses.  Anyhow there's one
> >> point I'd like to emphasize:
> >>
> >> I know it's really "cool" to maintain private source repositories  ;-)
> >>  ....  but for increasing the overall success of building FlightGear
> >> scenery I'd think it would be really beneficial to keep the various
> >> development efforts in close relation and sync.  Thus I'd invite
> >> everyone who's serious about improving the TerraGear toolchain to
> >> create a branch in the main repository in order to develop their
> >> specific features/changes there - not only but also because this would
> >> simplify tracking of the various changes.
> >>
> >> The former "terragear-cs" main repository at MapServer was already open
> >> to (almost) everybody who asked and now that it's moved over to
> >> Gitorious there's really no more excuse not to create branches inside
> >> the main repo  :-)
> >>
> >> Best regards,
> >>        Martin.
> >> --
> >>  Unix _IS_ user friendly - it's just selective about who its friends are !
> >> --------------------------------------------------------------------------
> >>
> >>
> >> ------------------------------------------------------------------------------
> >> RSA(R) Conference 2012
> >> Save $700 by Nov 18
> >> Register now
> >> http://p.sf.net/sfu/rsa-sfdev2dev1
> >> _______________________________________________
> >> Flightgear-devel mailing list
> >> Flightgear-devel@lists.sourceforge.net
> >> https://lists.sourceforge.net/lists/listinfo/flightgear-devel
> >>
> >
> >


-- 
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