[vtkusers] Visualizing multiple isosurfaces using vtkContourFilter

[Karthik Krishnan]

 Since this is a labelled image with several label (ids), you could use
vtkDiscreteMarchingCubes once on each label of interest instead of
vtkContourFilter. This will extract just the interface between the cells
containing the label of interest and its neighbors, whatever id they may
have.

--
karthik

On Thu, Feb 24, 2011 at 4:39 AM, Thommen Korah <thkorah at hotmail.com> wrote:

> Thanks for your help. I decided to use the first method with separate
> filters. I have multiple segmented regions, and each voxel stores the id
> that it belongs to. So all cells belonging to object 3 will store the number
> 3.
>
> But when I create cf3 filter and call cf3->setValue(0,3), it creates the
> isosurface using all cells. My intent is to create the surface only using
> cells storing 3. Any idea why this might be?
>
> Thanks.
>
> > Date: Wed, 23 Feb 2011 08:23:29 -0500
> > Subject: Re: [vtkusers] Visualizing multiple isosurfaces using
> vtkContourFilter
> > From: bill.lorensen at gmail.com
> > To: thkorah at hotmail.com
> > CC: vtkusers at vtk.org
>
> >
> > There are two ways to do this:
> >
> > 1) Create two ContourFilters. Use cf1->SetValue(0,val1) and
> > cf2->SetValue(0,val2).
> > You will need 2 mappers and actors.
> > 2) Create one ContourFilter. Use cf->SetValue(0,val1) and
> cf->SetValue(1,val2).
> > You will need 1 mapper and actor.
> >
> > Both use share the same memory.
> >
> > Coloring is easier in case 1).
> > mapper1->SetInput(cf1->GetOutput());
> > mapper1->ScalarVisibilityOff();
> > actor1->SetMapper(mapper1);
> > actor1->GetProperty()->SetDiffuseColor(r,g,b);
> > mapper2->SetInput(cf2->GetOutput());
> > mapper2->ScalarVisibilityOff();
> > actor2->SetMapper(mapper2);
> > actor2->GetProperty()->SetDiffuseColor(r,g,b);
> >
> > Case 2 is trickier and involves mucking with lookup tables.
> >
> >
> >
> > On Wed, Feb 23, 2011 at 1:16 AM, Thommen Korah <thkorah at hotmail.com>
> wrote:
> > > Hi,
> > > I have a pointcloud on which I perform segmentation to extract
> different
> > > structures projecting out of a flat surface (a table for example). The
> > > pointcloud is stored in a voxel data structure. I would now like to
> > > visualize these segmented regions by creating  isosurfaces using
> > > vtkContourFilter for each object. How can I generate multiple surfaces
> (eg.
> > > book and a cup lying on the table) using the same shared data in
> memory? I
> > > would also like to visualize each segmented region in a different
> color.
> > > Thanks.
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