[vtkusers] How to measure the volume from the many objects separated

[walmor godoi]

Grateful for the help, 
 
Interesting this TetGen library... 
But I need to get the volume of holes (the 12) separately. Each holecylindrical design has different sizes (the smallest has a diameter of1 mm). I need to get the measure of the volume for each. 
 So, how to measure the volume of them separately? Does anyone have any idea?

Walmor
----- Mensagem original ----
> De: Cory Quammen <cquammen at cs.unc.edu>
> Para: walmor godoi <wfisico at yahoo.com.br>
> Cc: vtkusers at vtk.org
> Enviadas: Quarta-feira, 27 de Fevereiro de 2008 15:59:35
> Assunto: Re: [vtkusers] How to measure the volume from the many objects separated
> 
> You could tetrahedralize the volume within isosurface and sum up the
> volumes of the tetrahedra in the result. I believe the vtkDelaunay3D
> won't do the job in this case because it ignores the surface
> information in your isosurface, constructing a Delaunay
> tetrahedralization from  just the point information. I have used the
> TetGen library (http://tetgen.berlios.de/) to generate what's called a
> constrained Delaunay tetrahedralization. This fills only the space
> interior to your isosurface with tetrahedra. The only requirement is
> that your isosurface has no holes, which is most like the case with
> output from marching cubes (unless the isosurface intersects the edge
> of the entire volume).
> 
> I have wrapped TetGen inside a VTK class to make it easy to use with
> the output of things like the marching cubes filter. I could send it
> to you, but you would have to set up a vtkLocal build, which may or
> may not be something you want to do.
> 
> Hope that helps,
> Cory
> 
> On Wed, Feb 27, 2008 at 1:10 PM, walmor godoi  wrote:
> > Hi,
> >
> >  I need estimate the volume and area from a phantom (a acrylic cylinder with 
> 12 holes in cylinder format too).
> >
> >  After the reconstruction by Marching Cubes of the phantom with 12 holes 
> (cilinder format), successfully, i used thevtkMassProperties for measures of 
> volume and surface area. But the volume and area was the extentof the entire 
> cylinder which contains the twelve holes, i.e.,  vtkMassProperties just seeing 
> the cylinder without the holes (I believe because theactors-holes should be 
> targeted or labelled so they can beindependently measured and it will be the 
> goal now).
> >
> >
> >  Does anyone have an example of how to measure the volume from the many 
> objects separated ?
> >
> >  
> ----------------------------------------------------------------------------------
> >  Walmor Cardoso Godoi, M. Sc.
> >  Curitiba - Paraná - Brazil
> >  Msn: walmorgodoi at hotmail.com
> >  Url: http://walmor.godoi.goglepages.com
> >  Blog (visite!): http://walmorgodoi.blogspot.com
> >  
> ----------------------------------------------------------------------------------
> >
> >
> >
> >
> >
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> 
> 
> 
> -- 
> Cory Quammen
> Department of Computer Science
> University of North Carolina at Chapel Hill
> http://www.cs.unc.edu/~cquammen
> 




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