[vtkusers] 3D Rendering of an sliced object

Fri Nov 11 15:31:15 EST 2005

Hello Sylvain, thanks a lot for your help in this matter.

Well, i finally can do the thing of the "extend", but i get to another
problem... i obtain the image that i attach to this message, but i need to
be otherwise, i mean, the "hole" part to be "tapped" and the outside part to
be open... i hope i express well, cause the english are not my natural
language.

Thanks 

  _____  

De: Sylvain Jaume [mailto:sylvain.jaume at kitware.com] 
Enviado el: Miércoles, 09 de Noviembre de 2005 13:24
Para: OnezerO
CC: vtkusers at vtk.org
Asunto: Re: [vtkusers] 3D Rendering of an sliced object

Hi OnezerO,

You can find the manpages for every VTK class here:
http://www.vtk.org/doc/nightly/html/classes.html

and here for vtkContourFilter:
http://www.vtk.org/doc/nightly/html/classvtkContourFilter.html

For more information, check the VTK book:
http://www.kitware.com/products/vtktextbook.html

Cheers,
Sylvain

OnezerO wrote: 

Meanwhile i do this, do you know where i can find the theory of the

vtkContour, to add to my final report.

Saludos,

OnezerO 

-----Mensaje original-----

De: Sylvain Jaume [mailto:sylvain.jaume at kitware.com] 

Enviado el: Martes, 08 de Noviembre de 2005 17:46

Para: OnezerO

CC: vtkusers at vtk.org

Asunto: Re: [vtkusers] 3D Rendering of an sliced object

Hi OnezerO,

What is wrong with showing part of a cube during your final examination?

Alternatively you could try this:

double scalarRange[2];

importer->GetOutput()->GetScalarRange(scalarRange);

[snip]

imageConstantPad->SetConstant(scalarRange[0]);

Cheers,

Sylvain

OnezerO wrote:

Ok, but the extent thing dindt work, even make another kind of image, 

like a part of a cube, didnt, work

-----Mensaje original-----

De: Sylvain Jaume [mailto:sylvain.jaume at kitware.com]

Enviado el: Martes, 08 de Noviembre de 2005 17:04

Para: OnezerO

CC: vtkusers at vtk.org

Asunto: Re: [vtkusers] 3D Rendering of an sliced object

Hi OnezerO,

Before your final examination, make these changes to your code:

// executing the filter

m_vtkImporter->Update();

// getting the extent of the input image m_vtkImporter->GetWholeExtent( 

extent );

// creating the extent for an image that has one more 'slice'

// in the 6 directions around the input image

	extent[0]--;

	extent[1]++;

	extent[2]--;

	extent[3]++;

	extent[4]--;

	extent[5]++;

// creating the extended image, so the input image is padded with zeros 

// i.e. black voxels vtkImageConstantPad  *m_vtkConstant = 

vtkImageConstantPad::New(); m_vtkConstant->SetInput(

m_vtkImporter->GetOutput() ); m_vtkConstant->SetOutputWholeExtent( 

extent );

Cheers,

Sylvain

OnezerO wrote:

Can you explain me that uses of this "extent"? 

Because if this get to work i have to present this in a final 

examination and i have to know how to works every part of the code 

Thanks

-----Mensaje original-----

De: Sylvain Jaume [mailto:sylvain.jaume at kitware.com]

Enviado el: Martes, 08 de Noviembre de 2005 13:41

Para: OnezerO

CC: vtkusers at vtk.org

Asunto: Re: [vtkusers] 3D Rendering of an sliced object

Hi OnezerO,

Could you try the code I sent you in my previous email (see below)?

Cheers,

Sylvain

OnezerO wrote:

Dont work

I did that:

ConnectPipelines(m_itkExporter , m_vtkImporter );

m_vtkImporter->Update();     

vtkImageConstantPad  *m_vtkConstant = vtkImageConstantPad::New(); 

m_vtkConstant->SetInput( m_vtkImporter->GetOutput() );

vtkContourFilter *m_vtkContour = vtkContourFilter::New(); 

m_vtkContour->SetInput( m_vtkConstant->GetOutput() );

The 3d image obtained its equals to the previous one

You say i should try this extent thing ?

-----Mensaje original-----

De: Sylvain Jaume [mailto:sylvain.jaume at kitware.com]

Enviado el: Martes, 08 de Noviembre de 2005 13:06

Para: OnezerO

CC: vtkusers at vtk.org

Asunto: Re: [vtkusers] 3D Rendering of an sliced object

Hi OnezerO,

The filter vtkImageConstantPad is in the Imaging directory:

http://www.vtk.org/doc/nightly/html/classvtkImageConstantPad.html

int extent[6];

image->GetWholeExtent( extent )

extent[0]--;

extent[1]++;

extent[2]--;

extent[3]++;

extent[4]--;

extent[5]++;

vtkImageConstantPad *constantPad = vtkImageConstantPad::New();

constantPad->SetInput(image);

constantPad->SetOutputWholeExtent(extent);

vtkContourFilter *contourFilter = vtkContourFilter::New();

contourFilter->SetInput(constantPad->GetOutput());

Cheers,

Sylvain

OnezerO wrote:

i didnt find this filter :(

-----Mensaje original-----

De: Sylvain Jaume [mailto:sylvain.jaume at kitware.com]

Enviado el: Martes, 08 de Noviembre de 2005 12:15

Para: OnezerO

CC: vtkusers at vtk.org

Asunto: Re: [vtkusers] 3D Rendering of an sliced object

Hi OnezerO,

Did you use vtkConstantPadFilter before applying vtkContourFilter as 

it was answered previously?

Cheers,

Sylvain

OnezerO wrote:

Hello, i'm send this post again because i think that i dont explain 

my problem very well... I have a series of images that represents a 

3d figure, this images was preprocesing with itk i'm receiving it 

with a Importer from vtk, i pass the data throught a Contourfilter 

and then by a SmoothFilter, the resulting 3d images has openings 

upside and downside, i wanna close this holes... how i do it???

Regards

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