[vtkusers] Visualizing multiple isosurfaces using vtkContourFilter

[Bill Lorensen]

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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