[vtkusers] Bad image rendering with vtkImageToPolyDataFilter

[Christophe Franco]

Hi everybody,

I'm trying to display an image taken from a PNG file. For that, I'm 
using a vtkImageToPolyDataFilter to convert it in order to be able to 
display it with other 3D objects. Here is my C++ code fragment :


vtkPNGReader* reader = vtkPNGReader::New();
reader->SetFileName("test.png"); // File in AmsaView directory
reader->Update();

vtkImageToPolyDataFilter* filter = vtkImageToPolyDataFilter::New();
filter->SetInput(reader->GetOutput());

vtkPolyDataMapper* imageMapper = vtkPolyDataMapper::New();
imageMapper->SetInput(filter->GetOutput());

vtkActor* imageActor = vtkActor::New();
imageActor->SetMapper(imageMapper);
imageActor->SetPosition(0, 0, 0);

[...]

The result is awful : there are always black lines across the image. See 
the source file (test.png) and a screen capture of the result (result.png).

What can I do ? Is there a proper way to use a vtkImageToPolyDataFilter 
that I didn't understand ? Or maybe another way to display the image ? 
What I want to do (later) is to images as glyphs to allow users to 
customize representation of points with their images.

Thank you in advance.
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