[vtkusers] vtkClipPolyData with vtkBox doesn't work

Mon Jan 18 04:35:54 EST 2010

Hi,

The subject is about vtkClipPolyData, but in your code you are using
vtkExtractPolyDataGeometry as a clipper 

This filter does not cut anything ! vtkExtractPolyDataGeometry extracts from
its input  all cells that are either completely inside or outside of a
specified implicit function.

All you have to do here is change your filter 

Just a quick tip : when I am stuck like this on common filters, I usually
try my pipeline by building it manually into Paraview. You can directly see
the results or change the filter parameters (such as the bounds, the
implicit function you’re using, 
). 

HTH,

Fred. 

Cordialement,

F.Danesi

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De : vtkusers-bounces at vtk.org [mailto:vtkusers-bounces at vtk.org] De la part
de Adeline Joliet
Envoyé : vendredi 15 janvier 2010 16:42
À : emonson at cs.duke.edu
Cc : vtkusers at vtk.org
Objet : Re: [vtkusers] vtkClipPolyData with vtkBox doesn't work

Hello,

Ok, here a simple code

// this is the futur cuted polydata..
 vtkCubeSource * rectangle = vtkCubeSource::New();

simpleCube->SetCenter(0,0,0);
simpleCube->SetXLength(150);
simpleCube->SetYLength(40);
simpleCube->SetZLength(100);

vtkBox * boxFunc = vtkBox::New();

 // a 20x20x20 box.
// I displayed a vtkCubeSource with the same bounds and it clearly intersect
with the rectangle...

 double testBounds[6];
 testBounds[0] = -10.0;
 testBounds[1] = 10.0;
 testBounds[2] = -10.0;
 testBounds[3] = 10.0;
 testBounds[4] = -10;
 testBounds[5] = 10.0;

 boxFunc->SetBounds(testBounds);

 vtkExtractPolyDataGeometry * clipper3 = vtkExtractPolyDataGeometry::New();

 clipper3->SetInput(simpleCube);
 clipper3->SetImplicitFunction(boxFunc);
 clipper3->ExtractInsideOn();
 clipper3->Update();

// Rendering stuff...
 vtkPolyDataMapper *map2 = vtkPolyDataMapper::New();
 map2->SetInput(clipper2->GetOutput());

 vtkActor* act2 = vtkActor::New();
 act2->SetMapper(map2);
 act2->SetProperty( this->CubeProperty);
 this->CurrentRenderer->AddActor(act2);

And renctangle is not displated.... if I se tExtractInsideOff rectangle is
displayed
but not cuted...

Regards,
Adeline

  _____  

Subject: Re: [vtkusers] vtkClipPolyData with vtkBox doesn't work
From: emonson at cs.duke.edu
Date: Fri, 15 Jan 2010 10:10:00 -0500
CC: vtkusers at vtk.org
To: adeline_joli at hotmail.com

Hello Adeline,

(Please reply to the whole list so others can help if they have ideas, too.)

Okay, if setting the bounds manually doesn't work, maybe you can post a more
complete code sample and someone will be able to play with it or spot the
problem.

Good luck,

-Eric

On Jan 15, 2010, at 5:00 AM, Adeline Joliet wrote:

Hello Eric,

Thank's for the answer.

"So, are you seeing nothing when you render your scene?"
Actually no, nothing appends my Polydata is not "cuted" it's exactly the
same size

Then I tried InsideOutOn() and now nothing is dislplayed.

I don't know where I can be wrong.. I will try again to set the bounds
manually, but not sure that's the problem..

Regards,
Adeline

  _____  

Subject: Re: [vtkusers] vtkClipPolyData with vtkBox doesn't work
From: emonson at cs.duke.edu
Date: Thu, 14 Jan 2010 14:28:52 -0500
CC: vtkusers at vtk.org
To: adeline_joli at hotmail.com

Hello Adeline,

So, are you seeing nothing when you render your scene? One thing to be
careful of when using a box for your clip function is which direction the
default normals of the box faces point -- this defines whether the clip
leaves the inside intact or cuts out the inside of the box. Maybe this isn't
the problem you're having, but you could try setting 

clipper->InsideOutOn();

and see if anything shows up.

Otherwise, there are examples of clipping with the vtkBoxWidget and it's
GetPlanes method in {vtksource}/Widgets/Testing/Cxx/BoxWidget.cxx and
{vtksource}/Examples/GUI/Python/BoxWidget.py in case those could help you
track down the problem or approach it in another way. 

Talk to you later,

-Eric

------------------------------------------------------

Eric E Monson

Duke Visualization Technology Group

On Jan 14, 2010, at 12:29 PM, Adeline Joliet wrote:

Hello,

I'm trying to cut un polydata using vtkClipPolyData with a vtkBox as
implicit function.

my Polydata is simply a rectangle (x = 100, y = 50, z= 20). I'd like to cut
this rectangle to obtain
only the part of the middle.. (so i'd like to cut to a right side AND a left
side...)

here is the code

 vtkBox * cuting = vtkBox::New();
  double boundy[6];

  //m_image is a vtkImageData that represent a cube (my rectangle polydata
interect this cube, so the bounds should be correct...)
  m_image->GetBounds(boundy);

  cuting->SetBounds(boundy);

vtkClipPolyData * clipper = vtkClipPolyData::New();
clipper->SetInput(newPolyData);
clipper->SetClipFunction(cuting);

// and then I display clipper->GetOutput...

the thing is that i tried with vtkPlane and it works... but the problem is
that i need if a use
vtkPlane I can cut only One side....

any help would be appreciated,
Than's

Adeline

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