[vtkusers] vtkClipPolyData with vtkBox doesn't work
Frederic Danesi
frederic.danesi at dinccs.com
Mon Jan 18 05:01:24 EST 2010
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
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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
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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
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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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