DataBounds

Description¶

This examples gets the bounds of a dataset. Note that Update() must be applied to create the output of the filter.

Question

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Code¶

DataBounds.cxx

#include <vtkNew.h>
#include <vtkPolyData.h>
#include <vtkSphereSource.h>
#include <vtkXMLPolyDataReader.h>

int main(int argc, char* argv[])
{
  vtkSmartPointer<vtkPolyData> polyData;

  if (argc > 1)
  {
    vtkNew<vtkXMLPolyDataReader> reader;
    reader->SetFileName(argv[1]);
    reader->Update();
    polyData = reader->GetOutput();
  }
  else
  {
    vtkNew<vtkSphereSource> modelSource;
    modelSource->Update();
    polyData = modelSource->GetOutput();
  }

  double bounds[6];
  polyData->GetBounds(bounds);

  std::cout << "xmin: " << bounds[0] << " "
            << "xmax: " << bounds[1] << std::endl
            << "ymin: " << bounds[2] << " "
            << "ymax: " << bounds[3] << std::endl
            << "zmin: " << bounds[4] << " "
            << "zmax: " << bounds[5] << std::endl;

  return EXIT_SUCCESS;
}

CMakeLists.txt¶

cmake_minimum_required(VERSION 3.12 FATAL_ERROR)

project(DataBounds)

find_package(VTK COMPONENTS 
)

if (NOT VTK_FOUND)
  message(FATAL_ERROR "DataBounds: Unable to find the VTK build folder.")
endif()

# Prevent a "command line is too long" failure in Windows.
set(CMAKE_NINJA_FORCE_RESPONSE_FILE "ON" CACHE BOOL "Force Ninja to use response files.")
add_executable(DataBounds MACOSX_BUNDLE DataBounds.cxx )
  target_link_libraries(DataBounds PRIVATE ${VTK_LIBRARIES}
)
# vtk_module_autoinit is needed
vtk_module_autoinit(
  TARGETS DataBounds
  MODULES ${VTK_LIBRARIES}
)

Download and Build DataBounds¶

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

cd DataBounds/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:

./DataBounds

WINDOWS USERS

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