[Insight-users] calculate normal

[Iván Macía]

Hi Rashed,

You can do what you mention with VTK or directly in ITK use
itk::BinaryMask3DMeshSource, which is the equivalent of Marching Cubes in
ITK. As the name implies, you need a binary mask (segmentation) as input.

HTH

Ivan

-----Mensaje original-----
De: insight-users-bounces+imacia=vicomtech.org at itk.org
[mailto:insight-users-bounces+imacia=vicomtech.org at itk.org] En nombre de
rashedk
Enviado el: miércoles, 20 de febrero de 2008 12:06
Para: insight-users at itk.org
Asunto: Re: [Insight-users] calculate normal


Hi, 

How do I convert my 3D image data to a simplex mesh in order to compute the
normals? Checking the class documentation for itk::SimplexMesh reveals that
one has to generate a triangle mesh and then use the
itkTriangleMeshToSimplexMeshFilter. But then how do I convert my 3D image
data to a triangle mesh?? Do I use vtkContour to produce polyData and then
convert it to itkMesh using appropriate filters? 

Any help will be appreciated, 

Thanks
Rashed 



Luis Ibanez wrote:
> 
> Hi Tony,
> 
> 
> Well.... if you only have a point, then there is no normal to compute.
> 
> You probably are thinking of a point from a surface, where a point
> belongs to several faces and have other points as neighbors.
> 
> 
> In that case you may want to look at the itk::SimplexMesh
> http://www.itk.org/Insight/Doxygen/html/classitk_1_1SimplexMesh.html
> 
> and its "ComputeNormal" method:
>
http://www.itk.org/Insight/Doxygen/html/classitk_1_1SimplexMesh.html#itk_1_1
SimplexMesha5
> 
> 
>     Regards,
> 
> 
>        Luis
> 
> 
> -------------------
> tony hakki wrote:
>> Is it possible to calculate normal of a point in ITK? If yes, Could you 
>> tell which class should be used?
>> thank you
>>  
>> 
> _______________________________________________
> Insight-users mailing list
> Insight-users at itk.org
> http://www.itk.org/mailman/listinfo/insight-users
> 
> 

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