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Thanks Kenichiro! This is what i am looking for.
<div>I could run your example smoothly. However, I tried to run with my data and adjusted the transform values that i applied in Paraview, t<span style="font-size: 12pt;">here was nothing extracted. </span></div>
<div><span style="font-size: 12pt;">I tried with a larger scale but it happened to be the same.</span></div>
<div>My dataset is frontal and centre with origin.</div>
<div>Is there anything that i have to adjust to get the extracted area?</div>
<div><br>
</div>
<div>Polly<br>
<br>
<div style="color: rgb(0, 0, 0);">
<hr style="display:inline-block;width:98%" tabindex="-1">
<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> kenichiro yoshimi <rccm.kyoshimi@gmail.com><br>
<b>Sent:</b> Saturday, August 11, 2018 11:08 AM<br>
<b>To:</b> polly_sukting@hotmail.com<br>
<b>Cc:</b> vtkusers<br>
<b>Subject:</b> Re: [vtkusers] How to extract a region using a box?</font>
<div> </div>
</div>
<div class="BodyFragment"><font size="2"><span style="font-size:11pt;">
<div class="PlainText">Hi,<br>
<br>
The Filter>Extract Cells By Region in ParaView uses vtkExtractGeometry<br>
class internally. So the following example may be helpful to automate<br>
polygon extractions with a specified box.<br>
<br>
--- ExtractGeometry.cxx ---<br>
#include <vtkBox.h><br>
#include <vtkCamera.h><br>
#include <vtkDataSetMapper.h><br>
#include <vtkExtractGeometry.h><br>
#include <vtkProperty.h><br>
#include <vtkRenderer.h><br>
#include <vtkRenderWindow.h><br>
#include <vtkRenderWindowInteractor.h><br>
#include <vtkSmartPointer.h><br>
#include <vtkSphereSource.h><br>
#include <vtkTransform.h><br>
<br>
int main (int, char *[])<br>
{<br>
vtkSmartPointer<vtkSphereSource> sphere =<br>
vtkSmartPointer<vtkSphereSource>::New();<br>
sphere->SetRadius(0.5);<br>
sphere->SetPhiResolution(50);<br>
sphere->SetThetaResolution(50);<br>
sphere->Update();<br>
<br>
vtkSmartPointer<vtkTransform> transform =<br>
vtkSmartPointer<vtkTransform>::New();<br>
transform->PreMultiply();<br>
transform->RotateZ(30.0);<br>
transform->Translate(0.5, 0.0, 0.0);<br>
<br>
vtkSmartPointer<vtkBox> box =<br>
vtkSmartPointer<vtkBox>::New();<br>
box->SetBounds(-0.5, 0.5, -0.5, 0.5, -0.5, 0.5);<br>
box->SetTransform(transform);<br>
<br>
vtkSmartPointer<vtkExtractGeometry> extractGeometry =<br>
vtkSmartPointer<vtkExtractGeometry>::New();<br>
extractGeometry->SetInputData(sphere->GetOutput());<br>
extractGeometry->SetImplicitFunction(box);<br>
extractGeometry->ExtractInsideOn();<br>
extractGeometry->ExtractBoundaryCellsOn();<br>
<br>
vtkSmartPointer<vtkDataSetMapper> mapper =<br>
vtkSmartPointer<vtkDataSetMapper>::New();<br>
mapper->SetInputConnection(extractGeometry->GetOutputPort());<br>
<br>
vtkSmartPointer<vtkActor> actor =<br>
vtkSmartPointer<vtkActor>::New();<br>
actor->SetMapper(mapper);<br>
actor->GetProperty()->SetColor(0.8900, 0.8100, 0.3400);<br>
<br>
// Create graphics stuff<br>
//<br>
vtkSmartPointer<vtkRenderer> ren =<br>
vtkSmartPointer<vtkRenderer>::New();<br>
ren->SetBackground(.3, .4, .6);<br>
<br>
vtkSmartPointer<vtkRenderWindow> renWin =<br>
vtkSmartPointer<vtkRenderWindow>::New();<br>
renWin->AddRenderer(ren);<br>
renWin->SetSize(512,512);<br>
<br>
vtkSmartPointer<vtkRenderWindowInteractor> iren =<br>
vtkSmartPointer<vtkRenderWindowInteractor>::New();<br>
iren->SetRenderWindow(renWin);<br>
<br>
// Add the actors to the renderer, set the background and size<br>
//<br>
ren->AddActor(actor);<br>
<br>
// Generate an interesting view<br>
//<br>
ren->ResetCamera();<br>
ren->GetActiveCamera()->Azimuth(120);<br>
ren->GetActiveCamera()->Elevation(30);<br>
ren->GetActiveCamera()->Dolly(1.0);<br>
ren->ResetCameraClippingRange();<br>
<br>
iren->Initialize();<br>
iren->Start();<br>
<br>
return EXIT_SUCCESS;<br>
}<br>
<br>
--- CMakeLists.txt ---<br>
cmake_minimum_required(VERSION 2.8)<br>
<br>
PROJECT(ExtractGeometry)<br>
<br>
find_package(VTK REQUIRED)<br>
include(${VTK_USE_FILE})<br>
<br>
add_executable(ExtractGeometry MACOSX_BUNDLE ExtractGeometry.cxx )<br>
<br>
target_link_libraries(ExtractGeometry ${VTK_LIBRARIES})<br>
---<br>
<br>
Regards<br>
2018年8月9日(木) 16:51 Polly Pui <polly_sukting@hotmail.com>:<br>
><br>
> Hi,<br>
><br>
> Can anyone please tell me how can I do extract a region by providing a box (which we can set the size of it) on a polydata?<br>
><br>
> I could do it manually in Paraview by selecting the Filter>Extract Cells By Region.<br>
><br>
> However, I have more than 1000 dataset. It is time consuming if I apply it manually for each dataset.<br>
><br>
><br>
> Thanks!<br>
><br>
><br>
> Best,<br>
><br>
> Polly<br>
><br>
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