[vtkusers] Extract a curvilinear slice of volume

[toulgen]

No idea to propose.

Thank you for your help.

-----Message d'origine-----
De : toulgen [mailto:toulgen at gmail.com] 
Envoyé : mardi 26 janvier 2010 17:53
À : 'Bill Lorensen'; 'David Gobbi'
Cc : 'vtkusers at vtk.org'
Objet : RE: [vtkusers] Extract a curvilinear slice of volume


Hi-vtkusers,

After some trial weeks I am always blocked.
I tried to extract the curvilinear plan with using the vtkPlanes class but
that does not give good result.

David/Bill can you give me more details concerning your suggestion.
Have you an example?

Thank you very much

ToulGen


-----Message d'origine-----
De : Bill Lorensen [mailto:bill.lorensen at gmail.com] 
Envoyé : mercredi 16 décembre 2009 18:59
À : David Gobbi
Cc : toulgen; vtkusers at vtk.org
Objet : Re: [vtkusers] Extract a curvilinear slice of volume

I have used 2) many times. Try it, you'll like it.

Bill

On Wed, Dec 16, 2009 at 12:15 PM, David Gobbi <david.gobbi at gmail.com> wrote:
> It's not an easy thing to do.  Here's are possible methods:
>
>
> 1) If you want the result to be an "image", then do the following:
>
> Create a grid (i.e. a vtkImageData) of scalar type "float" and 3
> scalar components.  Set the extent, origin, and position to be the
> same as that of the slice that you want to display.
>
> Populate the grid with vectors that go from the voxel positions in
> your slice (i.e. flat space) to the corresponding voxel position that
> you want to interpolate from in the original image (i.e. the position
> along your curved surface).
>
> You can use this grid to make a vtkGridTransform, and you can use the
> GridTransform in the SetTransform() method of vtkImageReslice.
>
>
> 2) If you don't care what the data type of the output will be, you can
> make a colored polydata surface as follows:
>
> Create a polydata surface mesh i.e. create the geometry of the surface
> that you wish to extract.  Use very small polygons, i.e. the polygons
> should be about the same size as your pixels.
>
> Use vtkProbeFilter to probe your volume and set the scalars of the
> surface mesh.  Before doing this, you should convert the image to RGB
> with vtkImageMapToColors.
>
>
> Good luck, I've never tried these methods myself but there is no
> reason why they shouldn't work.
>
>    David
>
>
> On Wed, Dec 16, 2009 at 9:01 AM, toulgen <toulgen at gmail.com> wrote:
>>
>> Hi vtk-users,
>>
>> To extract the axial, the coronal and the sagittal slice I use the
>> vtkImageReslice class.
>>
>> I want to extract a curvilinear slice of volume?
>>
>> What is class I can use?
>>
>> Thx
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