[vtkusers] vtkClipPolyData with vtkBox doesn't work

Mon Jan 18 04:55:43 EST 2010

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

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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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