TriangulateTerrainMap
VTKExamples/Cxx/Filtering/TriangulateTerrainMap
Description
This example generates heights (z value) on a 10x10 grid (a terrain map) and triangulates the points.
Code
TriangulateTerrainMap.cxx
#include <vtkVersion.h>
#include <vtkSmartPointer.h>
#include <vtkProperty.h>
#include <vtkPoints.h>
#include <vtkPolyData.h>
#include <vtkPointData.h>
#include <vtkDelaunay2D.h>
#include <vtkMath.h>
#include <vtkPolyDataMapper.h>
#include <vtkActor.h>
#include <vtkRenderWindow.h>
#include <vtkRenderer.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkVertexGlyphFilter.h>
int main(int, char *[])
{
// Create points on an XY grid with random Z coordinate
vtkSmartPointer<vtkPoints> points =
vtkSmartPointer<vtkPoints>::New();
unsigned int gridSize = 10;
for(unsigned int x = 0; x < gridSize; x++)
{
for(unsigned int y = 0; y < gridSize; y++)
{
points->InsertNextPoint(x, y, vtkMath::Random(0.0, 3.0));
}
}
// Add the grid points to a polydata object
vtkSmartPointer<vtkPolyData> polydata =
vtkSmartPointer<vtkPolyData>::New();
polydata->SetPoints(points);
vtkSmartPointer<vtkVertexGlyphFilter> glyphFilter =
vtkSmartPointer<vtkVertexGlyphFilter>::New();
#if VTK_MAJOR_VERSION <= 5
glyphFilter->SetInputConnection(polydata->GetProducerPort());
#else
glyphFilter->SetInputData(polydata);
#endif
glyphFilter->Update();
// Create a mapper and actor
vtkSmartPointer<vtkPolyDataMapper> pointsMapper =
vtkSmartPointer<vtkPolyDataMapper>::New();
pointsMapper->SetInputConnection(glyphFilter->GetOutputPort());
vtkSmartPointer<vtkActor> pointsActor =
vtkSmartPointer<vtkActor>::New();
pointsActor->SetMapper(pointsMapper);
pointsActor->GetProperty()->SetPointSize(3);
pointsActor->GetProperty()->SetColor(1,0,0);
// Triangulate the grid points
vtkSmartPointer<vtkDelaunay2D> delaunay =
vtkSmartPointer<vtkDelaunay2D>::New();
#if VTK_MAJOR_VERSION <= 5
delaunay->SetInput(polydata);
#else
delaunay->SetInputData(polydata);
#endif
delaunay->Update();
// Create a mapper and actor
vtkSmartPointer<vtkPolyDataMapper> triangulatedMapper =
vtkSmartPointer<vtkPolyDataMapper>::New();
triangulatedMapper->SetInputConnection(delaunay->GetOutputPort());
vtkSmartPointer<vtkActor> triangulatedActor =
vtkSmartPointer<vtkActor>::New();
triangulatedActor->SetMapper(triangulatedMapper);
// Create a renderer, render window, and interactor
vtkSmartPointer<vtkRenderer> renderer =
vtkSmartPointer<vtkRenderer>::New();
vtkSmartPointer<vtkRenderWindow> renderWindow =
vtkSmartPointer<vtkRenderWindow>::New();
renderWindow->AddRenderer(renderer);
vtkSmartPointer<vtkRenderWindowInteractor> renderWindowInteractor =
vtkSmartPointer<vtkRenderWindowInteractor>::New();
renderWindowInteractor->SetRenderWindow(renderWindow);
// Add the actor to the scene
renderer->AddActor(pointsActor);
renderer->AddActor(triangulatedActor);
renderer->SetBackground(.3, .6, .3); // Background color green
// Render and interact
renderWindow->Render();
renderWindowInteractor->Start();
return EXIT_SUCCESS;
}
CMakeLists.txt
cmake_minimum_required(VERSION 2.8)
PROJECT(TriangulateTerrainMap)
find_package(VTK REQUIRED)
include(${VTK_USE_FILE})
add_executable(TriangulateTerrainMap MACOSX_BUNDLE TriangulateTerrainMap.cxx)
target_link_libraries(TriangulateTerrainMap ${VTK_LIBRARIES})
Download and Build TriangulateTerrainMap
Click here to download TriangulateTerrainMap and its CMakeLists.txt file. Once the tarball TriangulateTerrainMap.tar has been downloaded and extracted,
cd TriangulateTerrainMap/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:
./TriangulateTerrainMap
WINDOWS USERS PLEASE NOTE: Be sure to add the VTK bin directory to your path. This will resolve the VTK dll's at run time.