[vtkusers] new users .. need some help for, as usual, 3D rendering

[Mathieu Malaterre]

Salut Florent,

	You can at any time print information on vtk object useing

obj->Update();  //important
obj->Print( cerr );

	I am guessing that you didn't change the contour value, so it might not 
match your data range. If you want you can print the scalar range of the 
image data:

reader->Update()
cerr << reader->GetOutput()->GetScalarRange()[0] << " "  << 
reader->GetOutput()->GetScalarRange()[1]

HTH
Mathieu

Florent.Chandelier at USherbrooke.ca wrote:
> Hi all,
> 
> my name is florent chandelier, and i'm a phd student at the university
> of Sherbrooke and I'm so new to VTK
> I have to work on a fluid mechanics and 3D modelling.
> 
> As i've been told, vtk is one of the best soft for that so here I am.
> 
> Everything's going fine with the provided medical examples but not when
> I tried to do this :
> 
> I want to render a 3D model of bone from BMP slices.
> My guess was to use the medical2.cxx, and especially the bone rendering
> section to get my model but all I have is  the empty cube rendering
> window, without any display.
> 
> here is the part of my code :
> 
> vtkRenderer *aRenderer = vtkRenderer::New();
>  vtkRenderWindow *renWin = vtkRenderWindow::New();
>    renWin->AddRenderer(aRenderer);
>  vtkRenderWindowInteractor *iren = vtkRenderWindowInteractor::New();
>    iren->SetRenderWindow(renWin);
> 
> // things I've changed
>  vtkBMPReader *v16 = vtkBMPReader::New();
>    v16->SetFilePrefix("slices"); // my files are named slices.0 to
> slices.xx
>    v16->Update ();
>    v16->SetDataExtent(0,255,0,255,0,20);
> 
> this is the only things i have changed and all I got is .. the empty
> cube window.
> 
> I have few more questions :
> does the "SetDataSpacing" refers to the voxel size ???
> do I have to filter my images first to get only the border of the bone (
> I'm working on cancelous/trabecular bone samples )
> 
> In fact I do not really understand how VTK render the voxel information ...
> 
> any sugestions, reading or else is greatfully accepted ...
> 
> flo
> 
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