[Insight-users] QuadEdgeMeshNormalFilter - Outwards or inwards

[Arnaud Gelas]

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
>>
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