[vtkusers] What's wrong with interpolation?

[mathieu coursolle]

Hi everbody,

I am using vtkImageData and vtkImageActor in a
vtkRenderWindow to display an image.
It works fine except that when I enable interpolation,
I get strange results. 

Is there a way to get rid of the artifacts in the image.
They seem to be produced by the edges.

Here is my code and I attached an example.

vtkImageData* image_data = vtkImageData::New;
image_data->SetScalarTypeToFloat();
image_data->SetNumberOfScalarComponents(1);
image_data->SetSpacing(spacing_x, spacing_y, 1);
image_data->SetOrigin(offset_x, offset_y, 0);
image_data->SetDimensions(size_x, size_y, 1);
image_data->AllocateScalars();

//Fill the image with the data.
BYTE* destination_data =
reinterpret_cast<BYTE*>(image_data->GetScalarPointer());
memcpy(destination_data, source_data.mPointer, size_x * size_y * sizeof(float));

 //Create the image map to colors.
vtkImageMapToRGBA* image_map = vtkImageMapToRGBA::New();
image_map->SetInput(image_data);
image_map->SetLookupTable(m_LookUpTable);
image_map->Update();

vtkImageActor* actor = vtkImageActor::New();
actor->SetInput(image_map->GetOutput());

actor->SetInterpolate(TRUE);

//Add the actor to the scene.
renderer->AddProp(actor.GetPointer());

Thanx a lot!
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