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Re: [geomview-users] geomview command language - transform command
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From: Qi P. <qp...@ca...> - 2009-02-07 17:28:22
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Thanks for filing the bug tracker. I'm thinking I've found another bug
though when using CGAL with geomview...
If the camera is transformed using the commands:
(read transform { transform define
campose
0.844592 0.166562 -0.508845 0.000000
0.166564 -0.984959 -0.045944 0.000000
-0.508844 -0.045952 -0.859632 0.000000
2.083080 0.269067 -0.853154 1.000000
} )
(camera "c0" camera { fov 67 worldtocam { : campose} } )
Then geomview segfaults when trying to draw more triangles using CGAL's
interface... I get the error:
Geomview(29301): internal error: "Segmentation violation"; dump core now
(y/n) [n] ?
(I'm relaying the GCL commands to geomview from my c++ code via a
CGAL::Geomview_stream).
Where is the log stored? I can't seem to find it (i've performed a "locate
geomview.log" with no results).
Googling for the error code leads to nothing :-(
Thanks for your help - currently trying to code something up for a video in
a computer vision conference talk in 3 days time, so your time has been
invaluable :-)
Cheers,
Qi
2009/2/7 <L....@su...>
> I've opened a bug on this in the tracker.
>
> https://sourceforge.net/tracker/index.php?func=detail&aid=2577843&group_id=9736&atid=109736
>
> For the triangle code, all I can think of: inspect piping output and make
> sure everything is closed
> and opened properly. One misplaced bracket can stall everything...
>
>
> <http://www.ee.surrey.ac.uk/Personal/L.Wood/><L....@su...>
>
>
>
> -----Original Message-----
> From: L....@su... [mailto:L....@su...<L....@su...>
> ]
> Sent: Sat 2009-02-07 16:52
> To: qp...@ca...
> Cc: cl...@ma...; geo...@li...
> Subject: Re: [geomview-users] geomview command language - transform command
>
> I just noticed in geomview/ChangeLog:
>
> 2006-10-29 Claus-Justus Heine <Claus.Heine@Mathematik.Uni-Freiburg.DE>
>
> * src/bin/NDview/NDdemo, src/bin/NDview/NDview,
> src/bin/geomview/common/drawer.c, src/bin/geomview/common/motion.c,
> src/bin/geomview/common/space.c, src/bin/geomview/common/transform.c,
> src/bin/geomview/common/transform.h, src/bin/geomview/common/ui.c,
> src/bin/geomview/x11/gvtoolui.c, src/bin/geomview/x11/gvui.c,
> src/bin/geomview/x11/interface/Tool.mib, src/bin/gvclock/gvclock.in:
> The "origin/bbox-center" keyword to transform and transform-incr
> was a
> bad idea. There is still a new button in the Tools-menu which
> translates the CENTER object to the currently selected geom's
> bounding box.
>
> Don't know why it was a bad idea - presumably it needs to be removed
> from documentation. The change in (help transform) output from 1.8 to 1.9
> suggests that this change was not completely reverted.
>
> L.
>
> <http://www.ee.surrey.ac.uk/Personal/L.Wood/><L....@su...>
>
>
>
> -----Original Message-----
> From: qi...@go... on behalf of Qi Pan
> Sent: Sat 2009-02-07 16:04
> To: Wood L Dr (Electronic Eng)
> Cc: geo...@li...; cl...@ma...
> Subject: Re: [geomview-users] geomview command language - transform command
>
> Hi,
>
> Thanks for your help - I think I'll give up with the bounding box center
> approach for the time being then.
>
> I've managed to get the camera into the views i want by repeatedly using
> the
> following command (with different tranfromation matrices):
>
> (read transform { transform define
>
> campose
>
> 0.844592 0.166562 -0.508845 0.000000
>
> 0.166564 -0.984959 -0.045944 0.000000
>
> -0.508844 -0.045952 -0.859632 0.000000
>
> 2.083080 0.269067 -0.853154 1.000000
> } )
>
> (progn (camera "c0" camera { fov 67 worldtocam { : campose} } ) )
>
> This all works well, apart from the fact I can't seem to be able to draw
> more triangles into the scene and then change the camera view!
>
> Am I going about transforming the camera in an incorrect way? The triangle
> drawing command (in my c++ code - i'm using Geomview via CGAL) is:
>
> gv.draw_triangles(cgal_triangles.begin(), cgal_triangles.end());
>
> where gv is a CGAL::Geomview_stream and cgaltriangles is a std::vector of
> triangles.
>
> Thanks for your help,
>
> Qi
> 2009/2/7 <L....@su...>
>
> > I played around with a variety of geomview versions, looking
> > at what (help transform) outputted (to stderr in the terminal
> > window - odd not to see the output in the Geomview command
> > window.)
> >
> > Geomview 1.8.1/.2rc9 gives:
> > (transform objectID centerID frameID
> > [rotate|translate|translate-scaled|scale] x y z [dt] ["smooth"])
> >
> > Geomview 1.9.0-4 gives:
> > (transform objectID centerID frameID
> > [rotate|translate|translate-scaled|scale] x y z [dt ["smooth"]])
> >
> > which has different nesting of dt etc at the end - so something
> > has certainly changed in the parser.
> >
> > A look through the documentation tells me:
> >
> >
> http://geomview.cvs.sourceforge.net/viewvc/geomview/geomview/doc/geomview.texi?r1=1.12&r2=1.13&pathrev=MAIN
> > that the bbox-center|origin tag was introduced by Claus (rotdrop)
> > on 29 October 2006 - line 6826. And Claus has made transform changes,
> > as the comparison of help outputs above suggests, but the documentation
> > seems a little awry
> > from what was implemented. Claus?
> >
> > Unfortunately, bounding box control doesn't seem to be one of the things
> > that can be handled
> > as a keypress, using an undocumented command in
> > geomview/src/bin/geomview/common/ui.c
> > (event-mode '[ab] Cam Orbit')
> > but adding it somehow might be a workaround.
> >
> > hope this helps,
> >
> >
> > L.
> >
> > <http://www.ee.surrey.ac.uk/Personal/L.Wood/><L....@su...>
> >
> >
> >
> > -----Original Message-----
> > From: qi...@go... on behalf of Qi Pan
> > Sent: Sat 2009-02-07 12:45
> > To: Wood L Dr (Electronic Eng)
> > Cc: geo...@li...
> > Subject: Re: [geomview-users] geomview command language - transform
> command
> >
> > Thanks again for your reply. Downloaded and installed 1.8.2.rc9, but
> > getting
> > the same thing. Both versions do not list bbox-center as an option when
> > typing (help transform) and both give the same error message if
> bbox-center
> > is added into the command...
> >
> > Do you get bbox-center as an option when you type (help transform) in the
> > console?
> >
> > Thanks,
> >
> > Qi
> >
> > 2009/2/7 <L....@su...>
> >
> > > Okay, the bbox-center option _should_ work in the command.
> > >
> > > Can you please try geomview 1.8.2rc9 and see whether the option
> > > works there for you? I'd like to narrow down whether your problem is
> the
> > > result of the 1.9 BBox changes, or indicative of something deeper.
> > >
> > >
> >
> http://sourceforge.net/project/showfiles.php?group_id=9736&package_id=9969
> > > and click pre-release.
> > >
> > > Provided you're placing objects with location global (rather than
> > relative
> > > to the camera), setting camera position should not be a problem.
> > >
> > > http://www.geom.uiuc.edu/software/geomview/ooglman.html
> > >
> > > # Example 1: A gcl command to define a transform
> > > # called "fred"
> > >
> > > (read transform { transform define fred
> > > 1 0 0 0
> > > 0 1 0 0
> > > 0 0 1 0
> > > -3 0 1 1
> > > }
> > > )
> > >
> > > # Example 2: A camera object using transform
> > > # "fred" for camera positioning
> > > # Given the definition above, this puts the camera at
> > > # (-3, 0, 1), looking toward -Z.
> > >
> > > { camera
> > > halfyfield 1
> > > aspect 1.33
> > > camtoworld { : fred }
> > > }
> > >
> > >
> > > L.
> > >
> > >
> > > <http://www.ee.surrey.ac.uk/Personal/L.Wood/><L....@su...>
> > >
> > >
> > >
> > > -----Original Message-----
> > > From: qi...@go... on behalf of Qi Pan
> > > Sent: Sat 2009-02-07 9:39
> > > To: Wood L Dr (Electronic Eng)
> > > Cc: geo...@li...
> > > Subject: Re: [geomview-users] geomview command language - transform
> > command
> > >
> > > Hi there,
> > >
> > > thanks for your reply. The checkbox works great, but unfortunately I'm
> > > using
> > > geomview as an automatic viewer. I have a camera which is moving and
> > would
> > > like to set the view in geomview to the real-time position of the
> camera
> > > calculated from my c++ code (without requring human interaction). The
> > > camera
> > > is circling the object (approximately), so I was going to use rotation
> > > around the center of the bounding box to approxiate. However, if the
> > > automated function seems to have been taken away, is there a way to set
> > the
> > > camera position using a 4x4 transformation matrix with the Geomview
> > Command
> > > Language?
> > >
> > > Thanks,
> > >
> > > Qi
> > > 2009/2/7 <L....@su...>
> > >
> > > > One of the changes Claus made to Geomview 1.9.0 was to add a
> > > > small '[B]box center' checkbox to the top of the Tools menu, to do
> > > > just this. Does that work?
> > > >
> > > > L.
> > > >
> > > > SaVi satellite constellation visualization: http://savi.sf.net/
> > > >
> > > > <http://www.ee.surrey.ac.uk/Personal/L.Wood/><L....@su...>
> > > >
> > > >
> > > >
> > > >
> > > > -----Original Message-----
> > > > From: Qi Pan [mailto:qp...@ca... <qp...@ca...> <
> qp...@ca...> <
> > qp...@ca...> <qp...@ca...
> > > >]
> > > > Sent: Sat 2009-02-07 1:13
> > > > To: geo...@li...
> > > > Subject: [geomview-users] geomview command language - transform
> command
> > > >
> > > > Hi,
> > > >
> > > > in the manual for the 1.9.4, it states the GCL transform command is:
> > > >
> > > > (transform objectID centerID frameID
> > > > [rotate|translate|translate-scaled|scale] x y z [bbox-center|origin]
> > [dt
> > > > [smooth]])
> > > >
> > > > http://www.geomview.org/docs/html/transform.html#transform
> > > >
> > > > However, I can't seem to use the optional [bbox-center|origin]
> bit...
> > > >
> > > > Using the command (transform g1 g1 g1 rotate 3.14 0 0 bbox-center)
> > > >
> > > > I get: " transform: float expected in arg position 8 (got
> > > "bbox-center")
> > > > "
> > > >
> > > > I need an object to rotate around its own bbox-center, which seems
> > > > impossible without this option.
> > > >
> > > > Typing help in the command line for the transform function seems to
> > > > indicate
> > > > that this option is not available. I'm in Euclidean space, which the
> > > manual
> > > > says is the only space it works in.
> > > >
> > > > If anyone could offer any help, that would be great.
> > > >
> > > > Cheers,
> > > >
> > > > Qi
> > > >
> > > >
> > >
> > >
> >
> >
>
>
>
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