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ContourQuadric

VTKEx/Cxx/VisualizationAlgorithms/ContourQuadric

Description¶

Contouring quadric function. Pipeline topology, and C++ code

Info

See Figure 6-39 in Chapter 6 the VTK Textbook.

Other languages

See (Python)

Question

If you have a simple question about this example contact us at VTKExProject If your question is more complex and may require extended discussion, please use the VTK Discourse Forum

Code¶

ContourQuadric.cxx

#include <vtkActor.h>
#include <vtkCamera.h>
#include <vtkContourFilter.h>
#include <vtkNamedColors.h>
#include <vtkOutlineFilter.h>
#include <vtkPolyDataMapper.h>
#include <vtkProperty.h>
#include <vtkQuadric.h>
#include <vtkRenderWindow.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkRenderer.h>
#include <vtkSampleFunction.h>

int main( int, char *[] )
{
  vtkSmartPointer<vtkNamedColors> colors =
    vtkSmartPointer<vtkNamedColors>::New();

  vtkSmartPointer<vtkRenderer> aren =
    vtkSmartPointer<vtkRenderer>::New();

  vtkSmartPointer<vtkRenderWindow> renWin =
    vtkSmartPointer<vtkRenderWindow>::New();
  renWin->AddRenderer(aren);

  vtkSmartPointer<vtkRenderWindowInteractor> iren =
    vtkSmartPointer<vtkRenderWindowInteractor>::New();
  iren->SetRenderWindow(renWin);

//
// Create surfaces F(x,y,z) = constant
//
  // Sample quadric function
  vtkSmartPointer<vtkQuadric> quadric =
    vtkSmartPointer<vtkQuadric>::New();
  quadric->SetCoefficients(.5,1,.2,0,.1,0,0,.2,0,0);
  vtkSmartPointer<vtkSampleFunction> sample =
    vtkSmartPointer<vtkSampleFunction>::New();
  sample->SetSampleDimensions(50,50,50);
  sample->SetImplicitFunction(quadric);

  vtkSmartPointer<vtkContourFilter> contour =
    vtkSmartPointer<vtkContourFilter>::New();
  contour->SetInputConnection(sample->GetOutputPort());
  contour->GenerateValues(5,0,1.2);

  vtkSmartPointer<vtkPolyDataMapper> contourMapper =
    vtkSmartPointer<vtkPolyDataMapper>::New();
  contourMapper->SetInputConnection(contour->GetOutputPort());
  contourMapper->SetScalarRange(0,1.2);

  vtkSmartPointer<vtkActor> contourActor =
    vtkSmartPointer<vtkActor>::New();
  contourActor->SetMapper(contourMapper);

  // Create outline
  vtkSmartPointer<vtkOutlineFilter> outline =
    vtkSmartPointer<vtkOutlineFilter>::New();
  outline->SetInputConnection(sample->GetOutputPort());

  vtkSmartPointer<vtkPolyDataMapper> outlineMapper =
    vtkSmartPointer<vtkPolyDataMapper>::New();
  outlineMapper->SetInputConnection(outline->GetOutputPort());

  vtkSmartPointer<vtkActor> outlineActor =
    vtkSmartPointer<vtkActor>::New();
  outlineActor->SetMapper(outlineMapper);
  outlineActor->GetProperty()->SetColor(colors->GetColor3d("Brown").GetData());
  outlineActor->GetProperty()->SetLineWidth(3.0);

//
// Rendering stuff
//
  aren->SetBackground(colors->GetColor3d("SlateGray").GetData());
  aren->AddActor(contourActor);
  aren->AddActor(outlineActor);

  aren->ResetCamera();
  aren->GetActiveCamera()->Azimuth(30);
  aren->GetActiveCamera()->Elevation(30);

  renWin->SetSize(640, 512);
  renWin->Render();

  // interact with data
  iren->Start();

  return EXIT_SUCCESS;
}

CMakeLists.txt¶

cmake_minimum_required(VERSION 3.3 FATAL_ERROR)

project(ContourQuadric)

find_package(VTK COMPONENTS 
  vtkvtkCommonColor
  vtkvtkCommonDataModel
  vtkvtkFiltersCore
  vtkvtkFiltersModeling
  vtkvtkImagingHybrid
  vtkvtkInteractionStyle
  vtkvtkRenderingContextOpenGL2
  vtkvtkRenderingCore
  vtkvtkRenderingFreeType
  vtkvtkRenderingGL2PSOpenGL2
  vtkvtkRenderingOpenGL2 QUIET)
if (NOT VTK_FOUND)
  message("Skipping ContourQuadric: ${VTK_NOT_FOUND_MESSAGE}")
  return ()
endif()
message (STATUS "VTK_VERSION: ${VTK_VERSION}")
if (VTK_VERSION VERSION_LESS "8.90.0")
  # old system
  include(${VTK_USE_FILE})
  add_executable(ContourQuadric MACOSX_BUNDLE ContourQuadric.cxx )
  target_link_libraries(ContourQuadric PRIVATE ${VTK_LIBRARIES})
else ()
  # include all components
  add_executable(ContourQuadric MACOSX_BUNDLE ContourQuadric.cxx )
  target_link_libraries(ContourQuadric PRIVATE ${VTK_LIBRARIES})
  # vtk_module_autoinit is needed
  vtk_module_autoinit(
    TARGETS ContourQuadric
    MODULES ${VTK_LIBRARIES}
    )
endif ()

Download and Build ContourQuadric¶

Click here to download ContourQuadric and its CMakeLists.txt file. Once the tarball ContourQuadric.tar has been downloaded and extracted,

cd ContourQuadric/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:

./ContourQuadric

WINDOWS USERS

Be sure to add the VTK bin directory to your path. This will resolve the VTK dll's at run time.