[Community] [Insight-users] QuadEdgeMeshNormalFilter - Outwards or inwards

Oscar Esteban oesteban at die.upm.es
Sat Oct 26 01:05:47 EDT 2013


Dear Jon, Arnaud,

Thanks a lot for your answers, and sorry that I missed your answers for a
long while.

I didn't try to visualize it (never managed to write vectors on vtk
polydata, probably is very easy but I must admit I've been rather sloppy
regarding that).

What Arnaud commented makes a lot of sense. On my case, I empirically check
the direction and they are inwards. But probably, it'd be much faster and
reliable if I checked the order of triangles as Arnaud suggested.

Thanks a lot

Best,
Oscar Esteban


*______________________________________*
*Oscar Esteban*
PhD Student / Researcher

Biomedical Image Technologies (BIT), UPM
ETSI Telecomunicación Lab. C203, Av. Complutense s/n - E-28040 Madrid
(Spain)
+34 915 495 700 ext.4234

Signal Processing Laboratory (LTS5), EPFL-STI-IEL-LTS5
ELD 224 (Bâtiment ELD), Station 11, CH-1015 Lausanne, Switzerland


On 1 October 2013 01:05, Arnaud Gelas <arnaudgelas at gmail.com> wrote:

> Dear Oscar,
>
> You can't know in advance if it is pointing inward or outward.
> One itk::QuadEdgeMesh is oriented, and so the orientation of the normal
> depends on the order triangles are filled in, then AFAIR the orientation is
> then counterclockwise.
>
> HTH
>
>
> On Tue, Oct 1, 2013 at 9:54 AM, Jon Haitz Legarreta <
> jhlegarreta at vicomtech.org> wrote:
>
>> Dear Óscar,
>> although I haven't tried the filter, I would dare to say that it should
>> point outwards if done according to the "normal vector" definition.
>> Were you able to visualize it? May be with VTK or writing the output and
>> using Paraview?
>>
>> It would be nice if you shared what it gives by default.
>>
>> Kind regards,
>> JON HAITZ
>>
>>
>>
>> On 22 June 2013 13:13, Oscar Esteban <oesteban at die.upm.es> wrote:
>>
>>> Dear ITK experts,
>>>
>>> When computing the normals of a closed surface, the resulting vectors
>>> are inwards or outwards?
>>>
>>> I'm trying to figure it out from code but I didn't get it. I also looked
>>> in the software guide and the documentation.
>>>
>>> Best,
>>> Oscar
>>>
>>>
>>> *______________________________________*
>>> *Oscar Esteban*
>>> PhD Student / Researcher
>>>
>>> Biomedical Image Technologies (BIT), UPM
>>> ETSI Telecomunicación Lab. C203, Av. Complutense s/n - E-28040 Madrid
>>> (Spain)
>>> +34 915 495 700 ext.4234
>>>
>>> Signal Processing Laboratory (LTS5), EPFL-STI-IEL-LTS5
>>> ELD 224 (Bâtiment ELD), Station 11, CH-1015 Lausanne, Switzerland
>>>
>>> _____________________________________
>>> Powered by www.kitware.com
>>>
>>> Visit other Kitware open-source projects at
>>> http://www.kitware.com/opensource/opensource.html
>>>
>>> Kitware offers ITK Training Courses, for more information visit:
>>> http://www.kitware.com/products/protraining.php
>>>
>>> Please keep messages on-topic and check the ITK FAQ at:
>>> http://www.itk.org/Wiki/ITK_FAQ
>>>
>>> Follow this link to subscribe/unsubscribe:
>>> http://www.itk.org/mailman/listinfo/insight-users
>>>
>>>
>>
>> _____________________________________
>> Powered by www.kitware.com
>>
>> Visit other Kitware open-source projects at
>> http://www.kitware.com/opensource/opensource.html
>>
>> Kitware offers ITK Training Courses, for more information visit:
>> http://www.kitware.com/products/protraining.php
>>
>> Please keep messages on-topic and check the ITK FAQ at:
>> http://www.itk.org/Wiki/ITK_FAQ
>>
>> Follow this link to subscribe/unsubscribe:
>> http://www.itk.org/mailman/listinfo/insight-users
>>
>>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://public.kitware.com/pipermail/community/attachments/20131025/c435371c/attachment.html>
-------------- next part --------------
_____________________________________
Powered by www.kitware.com

Visit other Kitware open-source projects at
http://www.kitware.com/opensource/opensource.html

Kitware offers ITK Training Courses, for more information visit:
http://www.kitware.com/products/protraining.php

Please keep messages on-topic and check the ITK FAQ at:
http://www.itk.org/Wiki/ITK_FAQ

Follow this link to subscribe/unsubscribe:
http://www.itk.org/mailman/listinfo/insight-users


More information about the Community mailing list