[vtkusers] Re: MarchingCubes

[Sean McInerney]

Jonathan,

   I'll check out your code.
   In the meantime, I had a quicker and dirtier idea that I decided to 
try out using vtkSurfaceReconstructionFilter and vtkImageThreshold to 
produce an binary ImageData volume from a PolyData surface. It's rough 
but interesting. The output is a volume rendering.

-Sean

Jonathan Bailleul wrote:
> Sean McInerney wrote:
> 
>>Jonathan,
>>
>>   That's a cool idea!
>>
>>   Foreach desired slice plane for the ImageData volume that you will
>>ultimately produce, do something like this:
>>
>>1.) Use vtkClipPolyData to get the 2D contour of the given slice.
>>
>>2.) Use vtkPolyDataToImageStencil to produce ImageStencilData
>>
>>3.) Use vtkImageStencil to produce the ImageData
>>     (need to do a little filtering to produce the desired binary image).
>>
>>4.) Use vtkAppendFilter to fuse the 2D binary images into a 3D volume.
>>     Hopefully, the ImageStencilData retains a 3D extent.
>>
>>5.) Voila! Binary volume from PolyData ... maybe.
>>
>>-Sean
> 
> 
> 
> Thanks for the help!
> 
> If someone is inspirated to actually implement this (or has already
> completed this), please notify me!
> Anyway, here is a stupid but working solution. Code is sometimes ugly,
> but it works (only voxels at border of each slice are "colored"). Output
> is AIR analyse format, recognized on ITK and usable on VTK if you know
> the parameters and consider the .img file as the raw volume.
> 
> All personal includes in:
> http://www.greyc.ismra.fr/~bailleul/Ressources/summary.html (see gpl
> code section)
> for those who really want to end up testing the program.
> 
> I really should have been more investigating on VTK abilities before
> doing all this by hand, but I was VTK newbie when I coded this and had
> most of the necessary code at hand on my personal libraries.
> 
> 
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