BoxClipUnstructuredGrid
VTKExamples/Cxx/Visualization/BoxClipUnstructuredGrid
Description
This example uses the data hexa.vtk
Code
BoxClipUnstructuredGrid.cxx
#include <vtkSmartPointer.h>
#include <vtkBoxClipDataSet.h>
#include <vtkLookupTable.h>
#include <vtkUnstructuredGridReader.h>
#include <vtkUnstructuredGrid.h>
#include <vtkDataSetSurfaceFilter.h>
#include <vtkDataSetMapper.h>
#include <vtkCamera.h>
#include <vtkActor.h>
#include <vtkRenderWindow.h>
#include <vtkRenderer.h>
#include <vtkRenderWindowInteractor.h>
int main(int argc, char *argv[])
{
if (argc < 2)
{
std::cout << "Usage: " << argv[0] << " file.vtk" << endl;
return EXIT_FAILURE;
}
// Read the data
vtkSmartPointer<vtkUnstructuredGridReader> reader =
vtkSmartPointer<vtkUnstructuredGridReader>::New();
reader->SetFileName (argv[1]);
reader->Update();
double bounds[6];
reader->GetOutput()->GetBounds(bounds);
double range[2];
reader->GetOutput()->GetScalarRange(range);
double minBoxPoint[3];
double maxBoxPoint[3];
minBoxPoint[0] = (bounds[1] - bounds[0]) / 2.0 + bounds[0];
minBoxPoint[1] = (bounds[3] - bounds[2]) / 2.0 + bounds[2];
minBoxPoint[2] = (bounds[5] - bounds[4]) / 2.0 + bounds[4];
maxBoxPoint[0] = bounds[1];
maxBoxPoint[1] = bounds[3];
maxBoxPoint[2] = bounds[5];
vtkSmartPointer<vtkBoxClipDataSet> boxClip =
vtkSmartPointer<vtkBoxClipDataSet>::New();
boxClip->SetInputConnection (reader->GetOutputPort());
boxClip->GenerateClippedOutputOn();
const double minusx[] = { -1.0, -0.5, 0.0 };
const double minusy[] = { 0.0, -1.0, 0.0 };
const double minusz[] = { 0.0, 0.0, -1.0 };
const double plusx[] = { 1.0, 0.0, 0.0 };
const double plusy[] = { 0.0, 1.0, 0.0 };
const double plusz[] = { 0.0, 0.0, 1.0 };
boxClip->SetBoxClip(minusx, minBoxPoint,
minusy, minBoxPoint,
minusz, minBoxPoint,
plusx, maxBoxPoint,
plusy, maxBoxPoint,
plusz, maxBoxPoint);
// Define a lut
vtkSmartPointer<vtkLookupTable> lut1 =
vtkSmartPointer<vtkLookupTable>::New();
lut1->SetHueRange (.667, 0);
vtkSmartPointer<vtkDataSetSurfaceFilter> surfaceIn =
vtkSmartPointer<vtkDataSetSurfaceFilter>::New();
surfaceIn->SetInputConnection (boxClip->GetOutputPort(0));
vtkSmartPointer<vtkDataSetMapper> mapperIn =
vtkSmartPointer<vtkDataSetMapper>::New();
mapperIn->SetInputConnection(surfaceIn->GetOutputPort());
mapperIn->SetScalarRange(reader->GetOutput()->GetScalarRange());
mapperIn->SetLookupTable(lut1);
mapperIn->SetColorModeToMapScalars();
vtkSmartPointer<vtkActor> actorIn =
vtkSmartPointer<vtkActor>::New();
actorIn->SetMapper(mapperIn);
vtkSmartPointer<vtkDataSetSurfaceFilter> surfaceOut =
vtkSmartPointer<vtkDataSetSurfaceFilter>::New();
surfaceOut->SetInputConnection (boxClip->GetOutputPort(1));
vtkSmartPointer<vtkDataSetMapper> mapperOut =
vtkSmartPointer<vtkDataSetMapper>::New();
mapperOut->SetInputConnection(surfaceOut->GetOutputPort());
mapperOut->SetScalarRange(reader->GetOutput()->GetScalarRange());
mapperOut->SetLookupTable(lut1);
mapperOut->SetColorModeToMapScalars();
vtkSmartPointer<vtkActor> actorOut =
vtkSmartPointer<vtkActor>::New();
actorOut->SetMapper(mapperOut);
actorOut->AddPosition(-.5 * (maxBoxPoint[0] - minBoxPoint[0]),
-.5 * (maxBoxPoint[1] - minBoxPoint[1]),
-.5 * (maxBoxPoint[2] - minBoxPoint[2]));
// Create a renderer, render window, and interactor
vtkSmartPointer<vtkRenderer> renderer =
vtkSmartPointer<vtkRenderer>::New();
renderer->SetBackground(.5, .5, .5);
vtkSmartPointer<vtkRenderWindow> renderWindow =
vtkSmartPointer<vtkRenderWindow>::New();
renderWindow->AddRenderer(renderer);
vtkSmartPointer<vtkRenderWindowInteractor> renderWindowInteractor =
vtkSmartPointer<vtkRenderWindowInteractor>::New();
renderWindowInteractor->SetRenderWindow(renderWindow);
// Add the actor to the scene
renderer->AddActor(actorIn);
renderer->AddActor(actorOut);
// Generate an interesting view
renderer->ResetCamera();
renderer->GetActiveCamera()->Azimuth(120);
renderer->GetActiveCamera()->Elevation(30);
renderer->GetActiveCamera()->Dolly(1.0);
renderer->ResetCameraClippingRange();
// Render and interact
renderWindow->Render();
renderWindowInteractor->Start();
return EXIT_SUCCESS;
}
CMakeLists.txt
cmake_minimum_required(VERSION 2.8)
PROJECT(BoxClipUnstructuredGrid)
find_package(VTK REQUIRED)
include(${VTK_USE_FILE})
add_executable(BoxClipUnstructuredGrid MACOSX_BUNDLE BoxClipUnstructuredGrid.cxx)
target_link_libraries(BoxClipUnstructuredGrid ${VTK_LIBRARIES})
Download and Build BoxClipUnstructuredGrid
Click here to download BoxClipUnstructuredGrid and its CMakeLists.txt file. Once the tarball BoxClipUnstructuredGrid.tar has been downloaded and extracted,
cd BoxClipUnstructuredGrid/build
If VTK is installed:
cmake ..
If VTK is not installed but compiled on your system, you will need to specify the path to your VTK build:
cmake -DVTK_DIR:PATH=/home/me/vtk_build ..
Build the project:
make
and run it:
./BoxClipUnstructuredGrid
WINDOWS USERS PLEASE NOTE: Be sure to add the VTK bin directory to your path. This will resolve the VTK dll's at run time.