The GNU Triangulated Surface Library

> I now need to extend my computation to the case of multiple objects.
> Does some one know if it is possible to do that with gts? I had problem with
> that since the function GtsSurfaceInter admits just two surfaces.

Not sure.

Boolean processing in GTS does have some issues - see earlier list
posts (search for my name).
http://sourceforge.net/mailarchive/forum.php?forum_name=gts-general

> Could you eventually suggest other libraries?

http://www.cgal.org/

T.

Hi Tony,

thank for the prompt reply.

I am actually considering CGAL, but  it is not really a user friendly library.

A different question: do you know if it is possible to "clean" a Gts object (GtsSurface, Gnode,  GtsSurfaceInter)? I had found a way around for computing multiple intersection, but this required me to build lots of objects. Since I have to perform several evaluations of intersection, it could be computationally more convenient to reset end reuse GtsObjects for further computation, Instead of destroy and redeclare them all the time.

Thank

Michele

Il 10/05/2012 11:40, Toby Breckon ha scritto:

I now need to extend my computation to the case of multiple objects.
Does some one know if it is possible to do that with gts? I had problem with
that since the function GtsSurfaceInter admits just two surfaces.



Not sure.

Boolean processing in GTS does have some issues - see earlier list
posts (search for my name).
http://sourceforge.net/mailarchive/forum.php?forum_name=gts-general



Could you eventually suggest other libraries?



http://www.cgal.org/

T.

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2012/5/10 Toby Breckon <toby.breckon@...>:
>> I now need to extend my computation to the case of multiple objects.
>> Does some one know if it is possible to do that with gts? I had problem with
>> that since the function GtsSurfaceInter admits just two surfaces.
>
> Not sure.
>
> Boolean processing in GTS does have some issues - see earlier list
> posts (search for my name).
> http://sourceforge.net/mailarchive/forum.php?forum_name=gts-general
>
>> Could you eventually suggest other libraries?
>
> http://www.cgal.org/

And what do you think is the best free software mesh generation
library? I can't consider CGAL because is only C++ and I need C one. I
like GTS, but the latest stable version was in 2006 and apparently is
an abandoned project. I know QHULL, but it has not the capability of
constrained mesh generation. I know also R Shewchuck's Triangle (the
fastest), but is not free software and it's only 2D

Thanks

>
> T.
>
> ------------------------------------------------------------------------------
> Live Security Virtual Conference
> Exclusive live event will cover all the ways today's security and
> threat landscape has changed and how IT managers can respond. Discussions
> will include endpoint security, mobile security and the latest in malware
> threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/
> _______________________________________________
> Gts-general mailing list
> Gts-general@...
> https://lists.sourceforge.net/lists/listinfo/gts-general



-- 
*****************************************
José Luis García Pallero
jgpallero@...
(o<
/ / \
V_/_
Use Debian GNU/Linux and enjoy!
*****************************************

Sorry - i'd recommend CGAL or PCL (pointclouds.org/). Both are C++.

I have also used Tamal Dey's software (but not an open source lib):
http://www.cse.ohio-state.edu/~tamaldey/

Cheers,

Toby.

On 10 May 2012 11:05, José Luis García Pallero <jgpallero@...> wrote:
> 2012/5/10 Toby Breckon <toby.breckon@...>:
>>> I now need to extend my computation to the case of multiple objects.
>>> Does some one know if it is possible to do that with gts? I had problem with
>>> that since the function GtsSurfaceInter admits just two surfaces.
>>
>> Not sure.
>>
>> Boolean processing in GTS does have some issues - see earlier list
>> posts (search for my name).
>> http://sourceforge.net/mailarchive/forum.php?forum_name=gts-general
>>
>>> Could you eventually suggest other libraries?
>>
>> http://www.cgal.org/
>
> And what do you think is the best free software mesh generation
> library? I can't consider CGAL because is only C++ and I need C one. I
> like GTS, but the latest stable version was in 2006 and apparently is
> an abandoned project. I know QHULL, but it has not the capability of
> constrained mesh generation. I know also R Shewchuck's Triangle (the
> fastest), but is not free software and it's only 2D
>
> Thanks
>
>>
>> T.
>>
>> ------------------------------------------------------------------------------
>> Live Security Virtual Conference
>> Exclusive live event will cover all the ways today's security and
>> threat landscape has changed and how IT managers can respond. Discussions
>> will include endpoint security, mobile security and the latest in malware
>> threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/
>> _______________________________________________
>> Gts-general mailing list
>> Gts-general@...
>> https://lists.sourceforge.net/lists/listinfo/gts-general
>
>
>
> --
> *****************************************
> José Luis García Pallero
> jgpallero@...
> (o<
> / / \
> V_/_
> Use Debian GNU/Linux and enjoy!
> *****************************************

> A different question: do you know if it is possible to "clean" a Gts object
> (GtsSurface, Gnode,  GtsSurfaceInter)? I had found a way around for
> computing multiple intersection, but this required me to build lots of
> objects. Since I have to perform several evaluations of intersection, it
> could be computationally more convenient to reset end reuse GtsObjects for
> further computation, Instead of destroy and redeclare them all the time.

Can you cast to GtsObject and clone it.....

http://gts.sourceforge.net/reference/gts-object-class.html#GTS-OBJECT-CLONE

I am unsure.

Create one. Clone it. Process original. Copy clone. Process copy .... etc.

T.

It does not work. I tried clone, copy, gts_object_init,  gts_object_reset_reserved.

In all the case it ADD the two surfaces.

The only solution working was

GtsSurface * SurfA = gts_surface_new (    gts_surface_class (),
                                    GTS_FACE_CLASS (gts_nface_class ()),
                                    GTS_EDGE_CLASS (gts_nedge_class ()),
                                    GTS_VERTEX_CLASS (gts_nvertex_class ()));

do something...

SurfA = gts_surface_new (    gts_surface_class (),
                                    GTS_FACE_CLASS (gts_nface_class ()),
                                    GTS_EDGE_CLASS (gts_nedge_class ()),
                                    GTS_VERTEX_CLASS (gts_nvertex_class ()));

This actually reset SurfA but result, of course and unfortunately, in  a memory leak.
Any suggestion?

BTW, do you have experience with CGAL? Have you tried some boolean operation with it?

Michele

Il 10/05/2012 12:25, Toby Breckon ha scritto:

A different question: do you know if it is possible to "clean" a Gts object
(GtsSurface, Gnode,  GtsSurfaceInter)? I had found a way around for
computing multiple intersection, but this required me to build lots of
objects. Since I have to perform several evaluations of intersection, it
could be computationally more convenient to reset end reuse GtsObjects for
further computation, Instead of destroy and redeclare them all the time.



Can you cast to GtsObject and clone it.....

http://gts.sourceforge.net/reference/gts-object-class.html#GTS-OBJECT-CLONE

I am unsure.

Create one. Clone it. Process original. Copy clone. Process copy .... etc.

T.



--
Eng. Michele Conconi, Ph.D.
Health Sciences and Technologies - Interdepartmental Center for Industrial Research (HST - ICIR)
Alma Mater Studiorum - University of Bologna
Viale Risorgimento 2, 40136, Bologna, Italy
Email: michele.conconi@...>
Website: http://grab.diem.unibo.it/
Office: (+39) 051 20 93451
Mobile: (+39) 329 0287996



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On 10 May 2012 13:38, Michele Conconi <michele.conconi@...> wrote:
> It does not work. I tried clone, copy, gts_object_init,
> gts_object_reset_reserved.
>
> In all the case it ADD the two surfaces.

I don't understand.

GtsSurface * SurfA = gts_surface_new ( .... );
< fill surface with faces etc >
GtsSurface * SurfB = GTS_SURFACE(gts_object_clone (GTS_OBJECT(SurfA)));

Does this not work ?

Also Try:

GtsSurface * SurfA = gts_surface_new (    gts_surface_class (),
                                    GTS_FACE_CLASS (gts_nface_class ()),
                                    GTS_EDGE_CLASS (gts_nedge_class ()),
< do stuff >
gts_object_destroy (GTS_OBJECT(SurfA));
SurfA = gts_surface_new (    gts_surface_class (),
                                    GTS_FACE_CLASS (gts_nface_class ()),
                                    GTS_EDGE_CLASS (gts_nedge_class ()),
                                    GTS_VERTEX_CLASS (gts_nvertex_class ()));

.... no memory leak, AFAIK.

> BTW, do you have experience with CGAL? Have you tried some boolean operation
> with it?

Yes, sometime ago now. No.

T.

It appears VTK now does this .....

Boolean Operations on Surfaces in VTK Without External Libraries
Quammen C., Weigle C., Taylor II R.M.
The University of North Carolina at Chapel Hill
http://hdl.handle.net/10380/3262

http://www.vtk.org/doc/nightly/html/classvtkBooleanOperationPolyDataFilter.html

Although earlier it too used GTS to achieve this:

Boolean Operations on Surfaces for VTK
Lloyd B.
Computer Vision Laboratory, ETH Zurich
http://hdl.handle.net/10380/3169

Toby.