[vtkusers] vtkClipPolyData with vtkBox doesn't work

Frederic Danesi frederic.danesi at dinccs.com
Mon Feb 1 10:39:38 EST 2010


And what happen when you click on inside out ? 

It seems like your box is tangent to your data_box 
 and when you clip, it
clips anything inside the box. Thus, you have a surface (without the
normals, ence the change of color).

 

HTH 

Fred.

 

Cordialement,

F.Danesi

-- 

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Email : frederic.danesi at dinccs.com

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De : Adeline Joliet [mailto:adeline_joli at hotmail.com] 
Envoyé : lundi 1 février 2010 13:41
À : frederic.danesi at dinccs.com; emonson at cs.duke.edu
Cc : vtkusers at vtk.org
Objet : RE: [vtkusers] vtkClipPolyData with vtkBox doesn't work

 

Hello again,

sorry for not having replied for such a long time...
So i used Paraview to reproduce my "simpel" pipeline.. 

Generate a Box
Apply the Clipping

And.. it doesn't work.. I have attached 2 screenshot, before and after the
apply. We can see the clipping box, but when I click on Apply
Nothing is clipped.. the cube just change a bit his color..

Howerver if I use "plane" as a clipping function.. it works...

Regards,
Adeline

  _____  

From: frederic.danesi at dinccs.com
To: adeline_joli at hotmail.com; emonson at cs.duke.edu
CC: vtkusers at vtk.org
Subject: RE: [vtkusers] vtkClipPolyData with vtkBox doesn't work
Date: Mon, 18 Jan 2010 11:01:24 +0100


 it’s not cutting 
 

Your polydata (output of a cube source) is rendered as a set of cells (quad
or triangle for example). Extracting does not cut 
 it remove some cells :
if a cell is overlapping your section plane, it will not cut the cell 
 it
will consider the cell as outside your selection 


 

However, if the problem remains while using vtkClipPolyData, then there is
another problem somewhere 
 

Hopefully, paraview will help you figure that out.

 

Fred.

 

Cordialement,

F.Danesi

-- 

Responsable Développement Informatique et Travail Collaboratif

Centre Technique DINCCS (Centre Technique Dédié à l’Ingénierie Numérique, la
Conception Collaborative et la Simulation)

MICADO / DINCCS

Pôle de Haute Technologie, BP 90005

08005 Charleville-Mézières Cedex

Tel. : +33 (0) 3.24.41.69.55 / +33 (0) 6.62.76.13.32

Email : frederic.danesi at dinccs.com

Web : www.afmicado.com / www.dinccs.com

 

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De : Adeline Joliet [mailto:adeline_joli at hotmail.com] 
Envoyé : lundi 18 janvier 2010 10:56
À : frederic.danesi at dinccs.com; emonson at cs.duke.edu
Cc : vtkusers at vtk.org
Objet : RE: [vtkusers] vtkClipPolyData with vtkBox doesn't work

 

Hello frederic,

yes I know the subject is about vtkClipPolyData but meanwhile I found the
vtkExtractPolyDataGeometry.
"vtkExtractPolyDataGeometry extracts from its input  all cells that are
either completely inside or outside of a specified implicit function."

that's exactly what I would like to do (it's a kind of cutting no ?) anyway
the problem it's the same either with vtkExtractPolyDataGeometry or
vtkClipPolyData 

not also that in the code I initialized vtkCubeSource * rectangle =
vtkCubeSource::New(); instead of simpleCube...

And thank you for the tip ! I didn't know that, I will try right now.

Regards,
Adeline

  _____  

From: frederic.danesi at dinccs.com
To: adeline_joli at hotmail.com; emonson at cs.duke.edu
CC: vtkusers at vtk.org
Subject: RE: [vtkusers] vtkClipPolyData with vtkBox doesn't work
Date: Mon, 18 Jan 2010 10:35:54 +0100

 

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

-- 

Responsable Développement Informatique et Travail Collaboratif

Centre Technique DINCCS (Centre Technique Dédié à l’Ingénierie Numérique, la
Conception Collaborative et la Simulation)

MICADO / DINCCS

Pôle de Haute Technologie, BP 90005

08005 Charleville-Mézières Cedex

Tel. : +33 (0) 3.24.41.69.55 / +33 (0) 6.62.76.13.32

Email : frederic.danesi at dinccs.com

Web : www.afmicado.com / www.dinccs.com

 

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This email and any files transmitted with it are confidential and intended
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This message contains confidential information and is intended only for the
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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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