[Insight-users] calculate normal

[rashedk]

Thanks, but now I am stuck trying to display a simplex mesh in VTK. How do I
visualize this mesh? Is there also a way to iterate through every point on
the mesh?  

Rashed. 


Leila Baghdadi-2 wrote:
> 
> Yep that's right and another note,
> 
> you "must" create a triangle mesh in order to create a simplex mesh!
> 
> If you are unsure about how it is done, check the paper 
> simplex mesh
> by herve delingette of INRIA france
> 
> good luck
> 
> Leila
> 
> On Wed, 2008-20-02 at 12:47 +0100, Iván Macía wrote:
>> 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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