# BlankPoint

VTKExamples/Cxx/StructuredGrid/BlankPoint

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### Code¶

BlankPoint.cxx

#include <vtkSmartPointer.h>
#include <vtkIdList.h>
#include <vtkProperty.h>
#include <vtkStructuredGrid.h>
#include <vtkXMLStructuredGridWriter.h>
#include <vtkMath.h>
#include <vtkDataSetMapper.h>
#include <vtkActor.h>
#include <vtkRenderWindow.h>
#include <vtkRenderer.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkStructuredGridGeometryFilter.h>
#include <vtkXMLPolyDataWriter.h>
#include <vtkXMLStructuredGridWriter.h>

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

vtkSmartPointer<vtkPoints> points =
vtkSmartPointer<vtkPoints>::New();

unsigned int gridSize = 8;
unsigned int counter = 0;
// Create a 5x5 grid of points
for(unsigned int j = 0; j < gridSize; j++)
{
for(unsigned int i = 0; i < gridSize; i++)
{
if(i == 3 && j == 3) // Make one point higher than the rest
{
points->InsertNextPoint(i, j, 2);
std::cout << "The different point is number " << counter << std::endl;
}
else
{
points->InsertNextPoint(i, j, 0); // Make most of the points the same height
}
counter++;
}
}

// Specify the dimensions of the grid
structuredGrid->SetDimensions(gridSize,gridSize,1);

structuredGrid->SetPoints(points);

structuredGrid->BlankPoint(27);
structuredGrid->Modified();

// Create a mapper and actor
vtkSmartPointer<vtkDataSetMapper> gridMapper =
vtkSmartPointer<vtkDataSetMapper>::New();
gridMapper->SetInputData(structuredGrid);

vtkSmartPointer<vtkActor> gridActor =
vtkSmartPointer<vtkActor>::New();
gridActor->SetMapper(gridMapper);
gridActor->GetProperty()->EdgeVisibilityOn();
gridActor->GetProperty()->SetEdgeColor(0,0,1);

// Create a renderer, render window, and interactor
vtkSmartPointer<vtkRenderer> renderer =
vtkSmartPointer<vtkRenderer>::New();
vtkSmartPointer<vtkRenderWindow> renderWindow =
vtkSmartPointer<vtkRenderWindow>::New();
vtkSmartPointer<vtkRenderWindowInteractor> renderWindowInteractor =
vtkSmartPointer<vtkRenderWindowInteractor>::New();
renderWindowInteractor->SetRenderWindow(renderWindow);

// Add the actor to the scene
renderer->SetBackground(.3, .6, .3); // Background color green

// Render and interact
renderWindow->Render();
renderWindowInteractor->Start();

return EXIT_SUCCESS;
}


### CMakeLists.txt¶

cmake_minimum_required(VERSION 3.3 FATAL_ERROR)

project(BlankPoint)

find_package(VTK COMPONENTS
vtkCommonCore
vtkCommonDataModel
vtkFiltersGeometry
vtkIOXML
vtkInteractionStyle
vtkRenderingCore
vtkRenderingFreeType
vtkRenderingOpenGL2 QUIET)
if (NOT VTK_FOUND)
message("Skipping BlankPoint: ${VTK_NOT_FOUND_MESSAGE}") return () endif() message (STATUS "VTK_VERSION:${VTK_VERSION}")
if (VTK_VERSION VERSION_LESS "8.90.0")
# old system
include(${VTK_USE_FILE}) add_executable(BlankPoint MACOSX_BUNDLE BlankPoint.cxx ) target_link_libraries(BlankPoint PRIVATE${VTK_LIBRARIES})
else ()
# include all components
target_link_libraries(BlankPoint PRIVATE ${VTK_LIBRARIES}) # vtk_module_autoinit is needed vtk_module_autoinit( TARGETS BlankPoint MODULES${VTK_LIBRARIES}
)
endif ()


cd BlankPoint/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:

./BlankPoint


WINDOWS USERS

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