GetLinearPointId

Question

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Code¶

GetLinearPointId.cxx

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

int main(int, char*[])
{
  // Create a grid
  vtkNew<vtkStructuredGrid> structuredGrid;

  // 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 3.12 FATAL_ERROR)

project(GetLinearPointId)

find_package(VTK COMPONENTS 
  CommonCore
  CommonDataModel
)

if (NOT VTK_FOUND)
  message(FATAL_ERROR "GetLinearPointId: 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(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}
)

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.