HedgeHog
VTKExamples/Cxx/Visualization/HedgeHog
Code¶
HedgeHog.cxx
#include <vtkVersion.h> #include "vtkSmartPointer.h" #include "vtkActor.h" #include "vtkCamera.h" #include "vtkFloatArray.h" #include "vtkHedgeHog.h" #include "vtkMath.h" #include "vtkPointData.h" #include "vtkPoints.h" #include "vtkPolyDataMapper.h" #include "vtkProperty.h" #include "vtkRenderWindow.h" #include "vtkRenderWindowInteractor.h" #include "vtkRenderer.h" #include "vtkStructuredGrid.h" static void CreateData(vtkStructuredGrid* sgrid); int main(int, char*[]) { // Create the structured grid. vtkSmartPointer<vtkStructuredGrid> sgrid = vtkSmartPointer<vtkStructuredGrid>::New(); CreateData(sgrid); // We create a simple pipeline to display the data. vtkSmartPointer<vtkHedgeHog> hedgehog = vtkSmartPointer<vtkHedgeHog>::New(); #if VTK_MAJOR_VERSION <= 5 hedgehog->SetInput(sgrid); #else hedgehog->SetInputData(sgrid); #endif hedgehog->SetScaleFactor(0.1); vtkSmartPointer<vtkPolyDataMapper> sgridMapper = vtkSmartPointer<vtkPolyDataMapper>::New(); sgridMapper->SetInputConnection(hedgehog->GetOutputPort()); vtkSmartPointer<vtkActor> sgridActor = vtkSmartPointer<vtkActor>::New(); sgridActor->SetMapper(sgridMapper); sgridActor->GetProperty()->SetColor(0,0,0); // Create the usual rendering stuff vtkSmartPointer<vtkRenderer> renderer = vtkSmartPointer<vtkRenderer>::New(); vtkSmartPointer<vtkRenderWindow> renWin = vtkSmartPointer<vtkRenderWindow>::New(); renWin->AddRenderer(renderer); vtkSmartPointer<vtkRenderWindowInteractor> iren = vtkSmartPointer<vtkRenderWindowInteractor>::New(); iren->SetRenderWindow(renWin); renderer->AddActor(sgridActor); renderer->SetBackground(1,1,1); renderer->ResetCamera(); renderer->GetActiveCamera()->Elevation(60.0); renderer->GetActiveCamera()->Azimuth(30.0); renderer->GetActiveCamera()->Zoom(1.25); renWin->SetSize(300,300); // interact with data renWin->Render(); iren->Start(); return EXIT_SUCCESS; } void CreateData(vtkStructuredGrid* sgrid) { int i, j, k, kOffset, jOffset, offset; float x[3], v[3], rMin=0.5, rMax=1.0, deltaRad, deltaZ; float radius, theta; static int dims[3]={13,11,11}; sgrid->SetDimensions(dims); // We also create the points and vectors. The points // form a hemi-cylinder of data. vtkSmartPointer<vtkFloatArray> vectors = vtkSmartPointer<vtkFloatArray>::New(); vectors->SetNumberOfComponents(3); vectors->SetNumberOfTuples(dims[0]*dims[1]*dims[2]); vtkSmartPointer<vtkPoints> points = vtkSmartPointer<vtkPoints>::New(); points->Allocate(dims[0]*dims[1]*dims[2]); deltaZ = 2.0 / (dims[2]-1); deltaRad = (rMax-rMin) / (dims[1]-1); v[2]=0.0; for ( k=0; k<dims[2]; k++) { x[2] = -1.0 + k*deltaZ; kOffset = k * dims[0] * dims[1]; for (j=0; j<dims[1]; j++) { radius = rMin + j*deltaRad; jOffset = j * dims[0]; for (i=0; i<dims[0]; i++) { theta = i * vtkMath::RadiansFromDegrees(15.0); x[0] = radius * cos(theta); x[1] = radius * sin(theta); v[0] = -x[1]; v[1] = x[0]; offset = i + jOffset + kOffset; points->InsertPoint(offset,x); vectors->InsertTuple(offset,v); } } } sgrid->SetPoints(points); sgrid->GetPointData()->SetVectors(vectors); }
CMakeLists.txt¶
cmake_minimum_required(VERSION 2.8) PROJECT(HedgeHog) find_package(VTK REQUIRED) include(${VTK_USE_FILE}) add_executable(HedgeHog MACOSX_BUNDLE HedgeHog.cxx) target_link_libraries(HedgeHog ${VTK_LIBRARIES})
Download and Build HedgeHog¶
Danger
The generation of tar files has not been ported to the new VTKExamples. Some tarballs may be missing or out-of-date.
Click here to download HedgeHog and its CMakeLists.txt file. Once the tarball HedgeHog.tar has been downloaded and extracted,
cd HedgeHog/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:
./HedgeHog
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.