Subject: CGAL users discussion list
List archive
- From: Sukhraj Singh <>
- To:
- Subject: Re: [cgal-discuss] Extracting the segments from a Surface Mesh
- Date: Mon, 23 May 2016 20:27:19 +0530
- Authentication-results: mail2-smtp-roc.national.inria.fr; spf=None ; spf=Pass ; spf=None
- Ironport-phdr: 9a23:ftai/ROCgDB7j8fLRykl6mtUPXoX/o7sNwtQ0KIMzox0Kfn7rarrMEGX3/hxlliBBdydsKIVzbGH+P+/EUU7or+/81k6OKRWUBEEjchE1ycBO+WiTXPBEfjxciYhF95DXlI2t1uyMExSBdqsLwaK+i760zceF13FOBZvIaytQ8iJ35XxjLH5pMKbSj4LrQT+SIs6FA+xowTVu5teqqpZAYF19CH0pGBVcf9d32JiKAHbtR/94sCt4MwrqHwI6Lpyv/NGSrjwKqQkUaRDXnNhKHEw/MSttB/ZTALJ6GFbSXQTihMPAg7L61bxUZ719yf7reFgwzLJAMvtULphWSi+97w5D1jzmSIfPng49nvWg4p+luVAsRe5rlt+xYDTJ4qaPf47cqLGds4BXjl9WZNaWCVFR4+9dIASFPEpPOBCroC7qUFdgwG5AFyXGeDv0DZKzkT326I6m7A6EAfJ3Eo7AtEOqn3WhNrwPaYWF+uyyf+bnn34c/pK1GKlu8DzeRc7rKTUUA==
Okay,
Assuming I don't use connected_components().
Assuming I don't use connected_components().
- Iterate through polyhedron.
- Create polyhedron of a segment using Polyhedron_incremental_builder_3.
On Mon, May 23, 2016 at 1:18 PM, Sebastien Loriot (GeometryFactory) <> wrote:
What I mean is if you need both clusters and segments but want to save on computation time, you can run the segmentation algorithm to extract
segments and then clusters using `connected_components()` (instead of
another run of segmentation).
Sebastien.
On 05/22/2016 02:32 PM, Sukhraj Singh wrote:
Thanks for your answer, Sebastien
Do I really need to use connected_components()
I already have the "segment_pmap", where the value is the segment id to
which that particular face belongs.
And one could parse the Polyhedron and collect all the faces having
particular segment ID.(Of-course I need to check, how to implement the same)
Is my understanding correct ?
Further, quoting from my previous email:
Two spatially apart areas( i.e. not having
common edges) of a Mesh may fall into same segment, since they had
comparable SDF values.
I am not sure about it, they of-course may fall into same cluster, but
may not be to the same segment. In such a case if, faces that don't
share edge, will fall into different segment always, even though they
were in same cluster, using connected_components() may not be required ?
On Thu, May 12, 2016 at 6:00 PM, Sebastien Loriot (GeometryFactory)< <mailto:>> wrote:
On 05/12/2016 02:16 PM, Sukhraj Singh wrote:
Salut,
The "Triangulated Surface Mesh Segmentation" module allows one to
segment a surface mesh using the SDF values.
It creates a Property Map which is colorized according to the
indices,
resulting into segments. Two spatially apart areas( i.e. not having
common edges) of a Mesh may fall into same segment, since they had
comparable SDF values.
My question is, how can one extract these segments. Since I want
to do
further processing on a segment separately. Also I would like
further
divide a segment, into say sub-segments , where a sub-segment
will have
faces which are not spatially apart, i.e. a subset which is having
common edges only.
Set the parameter output_cluster_ids to true when calling the
segmentation function
http://doc.cgal.org/latest/Surface_mesh_segmentation/group__PkgSurfaceSegmentation.html#ga8533ea7b1062ebbabe3bf23fed303f24
If you need also the segments, then set the option to false and
use the function connected_components() considering as constrained
edges the edges between two faces belonging to different
segments.
http://doc.cgal.org/latest/Polygon_mesh_processing/group__keep__connected__components__grp.html#gabe2052b2281e1e628e68d8fea94be2d9
Sebastien.
Thanks to inform.
P.S. I am a newbie.
--
Sukhraj Singh
--
You are currently subscribed to cgal-discuss.
To unsubscribe or access the archives, go to
https://sympa.inria.fr/sympa/info/cgal-discuss
--
Sukhraj Singh
--
You are currently subscribed to cgal-discuss.
To unsubscribe or access the archives, go to
https://sympa.inria.fr/sympa/info/cgal-discuss
--
Sukhraj Singh
- [cgal-discuss] Extracting the segments from a Surface Mesh, Sukhraj Singh, 05/12/2016
- Re: [cgal-discuss] Extracting the segments from a Surface Mesh, Sebastien Loriot (GeometryFactory), 05/12/2016
- Re: [cgal-discuss] Extracting the segments from a Surface Mesh, Sukhraj Singh, 05/22/2016
- Re: [cgal-discuss] Extracting the segments from a Surface Mesh, Sebastien Loriot (GeometryFactory), 05/23/2016
- Re: [cgal-discuss] Extracting the segments from a Surface Mesh, Sukhraj Singh, 05/23/2016
- Re: [cgal-discuss] Extracting the segments from a Surface Mesh, Sebastien Loriot (GeometryFactory), 05/23/2016
- Re: [cgal-discuss] Extracting the segments from a Surface Mesh, Sukhraj Singh, 05/23/2016
- Re: [cgal-discuss] Extracting the segments from a Surface Mesh, Sebastien Loriot (GeometryFactory), 05/23/2016
- Re: [cgal-discuss] Extracting the segments from a Surface Mesh, Sukhraj Singh, 05/22/2016
- Re: [cgal-discuss] Extracting the segments from a Surface Mesh, Sebastien Loriot (GeometryFactory), 05/12/2016
Archive powered by MHonArc 2.6.18.