GetLinearPointId

VTKExamples/Cxx/StructuredGrid/GetLinearPointId

Question

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Code

GetLinearPointId.cxx

#include <vtkSmartPointer.h>
#include <vtkStructuredData.h>
#include <vtkStructuredGrid.h>

int main(int, char *[])
{
  // Create a grid
  vtkSmartPointer<vtkStructuredGrid> structuredGrid =
    vtkSmartPointer<vtkStructuredGrid>::New();

  // Set the dimensions of the grid
  {
    int dims[3] = {5,10,1};
    structuredGrid->SetDimensions(dims);
  }

  // Retrieve the dimensions of the grid
  int dimensions[3];
  structuredGrid->GetDimensions(dimensions);

  {
  int queryPoint[3] = {4, 0, 0};
  vtkIdType pointId = vtkStructuredData::ComputePointId(dimensions, queryPoint);

  std::cout << "PointId: " << pointId << std::endl; // Outputs '4'
  }

  {
  int queryPoint[3] = {0, 1, 0};
  vtkIdType pointId = vtkStructuredData::ComputePointId(dimensions, queryPoint);

  std::cout << "PointId: " << pointId << std::endl; // Outputs '5'
  }
  return EXIT_SUCCESS;
}

CMakeLists.txt

cmake_minimum_required(VERSION 3.3 FATAL_ERROR)

project(GetLinearPointId)

find_package(VTK COMPONENTS 
  vtkCommonCore
  vtkCommonDataModel QUIET)
if (NOT VTK_FOUND)
  message("Skipping GetLinearPointId: ${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(GetLinearPointId MACOSX_BUNDLE GetLinearPointId.cxx )
  target_link_libraries(GetLinearPointId PRIVATE ${VTK_LIBRARIES})
else ()
  # include all components
  add_executable(GetLinearPointId MACOSX_BUNDLE GetLinearPointId.cxx )
  target_link_libraries(GetLinearPointId PRIVATE ${VTK_LIBRARIES})
  # vtk_module_autoinit is needed
  vtk_module_autoinit(
    TARGETS GetLinearPointId
    MODULES ${VTK_LIBRARIES}
    )
endif () 

Download and Build GetLinearPointId

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

cd GetLinearPointId/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:

./GetLinearPointId

WINDOWS USERS

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