[vtkusers] artifacts with vtkMarchingCubes

[Nadine Kempe]

Hi at all!

I have a problem with vtkMarchingCubes. I try to render a segmented heart in a vtkImageData. This  means, the imageData only contains 0 for background and 1 for heart. My code looks like this:

vtkMarchingCubes *iso = vtkMarchingCubes::New();
  
iso->SetInput(imageData);
iso->SetNumberOfContours(1);
iso->SetValue(0, 1.0);  
iso->Update();


Lookup = vtkLookupTable::New();
Lookup->Build();
Lookup->SetTableRange(0,1); 
Lookup->SetHueRange(0.1, 0.1);
Lookup->SetSaturationRange(1.0, 1.0);
Lookup->SetValueRange(1.0, 1.0);


// Map to polys and create the actor.
vtkPolyDataMapper* isoMapper = vtkPolyDataMapper::New();
isoMapper->SetInput(iso->GetOutput());
isoMapper->SetLookupTable(Lookup);
  
vtkActor *modelActor = vtkActor::New();
modelActor->VisibilityOn();
modelActor->SetMapper(isoMapper);
modelActor->GetProperty()->SetOpacity(1.0);
modelActor->GetProperty()->SetColor(0, 0, 0);

// Add the actor to the scene
this->RenderWidgetSE->RenderWidget->GetRenderer()->AddViewProp(modelActor);
this->RenderWidgetSE->RenderWidget->GetRenderer()->ResetCamera();
this->RenderWidgetSE->RenderWidget->GetRenderer()->Render();


The problem is, that sometimes I see some kind of artifacts at the border of my rendered region, it is hard to explain, that's why I attached a screenshot.

These artifacts sometimes get bigger, and sometimes there are not there at all.

Has anybody an idea or can give me some adivse?

Help is very appreciated! Thanks in advance for your time!
Greetings
Nadine
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