VTK/Tutorials/TriangleGeometryPolygon: Difference between revisions

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m (Write a file of a triangle moved to Triangle - Geometry + Polygon: Changed structure of polydata examples)
 
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==TrianglePolygon.cxx==
<source lang="cpp">
<source lang="cpp">
#include <iostream>
#include <vtkCellArray.h>
#include <vector>
#include <vtkSmartPointer.h>
#include <vtkPoints.h>
#include <vtkXMLPolyDataWriter.h>
#include <vtkPolyData.h>
#include <vtkTriangle.h>


#include "vtkCellArray.h"
int main(int argc, char *argv[])
#include "vtkPoints.h"
{
#include "vtkXMLPolyDataWriter.h"
  //setup points (geometry)
#include "vtkPolyData.h"
  vtkSmartPointer<vtkPoints> points = vtkSmartPointer<vtkPoints>::New();
#include "vtkTriangle.h"
  points->InsertNextPoint ( 1.0, 0.0, 0.0 );
  points->InsertNextPoint ( 0.0, 0.0, 0.0 );
  points->InsertNextPoint ( 0.0, 1.0, 0.0 );
 
  vtkSmartPointer<vtkCellArray> triangles = vtkSmartPointer<vtkCellArray>::New();
 
  //create a triangle on the three points in the polydata
  vtkSmartPointer<vtkTriangle> triangle = vtkSmartPointer<vtkTriangle>::New();
 
  //Unfortunately in this simple example the following lines are ambiguous.
  //The first 0 is the index of the triangle vertex which is ALWAYS 0-2.
  //The second 0 is the index into the point (geometry) array, so this can range from 0-(NumPoints-1)
  //i.e. a more general statement is triangle->GetPointIds()->SetId(0, PointId);
  triangle->GetPointIds()->SetId ( 0, 0 );
  triangle->GetPointIds()->SetId ( 1, 1 );
  triangle->GetPointIds()->SetId ( 2, 2 );


struct Point
  //add the triangle to the list of triangles (in this case there is only 1)
{
  triangles->InsertNextCell ( triangle );
double x,y,z;
Point(const double xin, const double yin, const double zin) : x(xin), y(yin), z(zin) {}
};


int main()
  //create a polydata object
{
  vtkSmartPointer<vtkPolyData> polydata = vtkSmartPointer<vtkPolyData>::New();
//setup points
std::vector<Point> Coords;
Coords.push_back(Point(1.0, 0.0, 0.0));
Coords.push_back(Point(0.0, 0.0, 0.0));
Coords.push_back(Point(0.0, 1.0, 0.0));
vtkPoints* Points = vtkPoints::New();
for ( unsigned int i = 0; i < Coords.size(); ++i )
{
Point P = Coords[i];
Points->InsertNextPoint(P.x, P.y, P.z);
}
std::vector<int> VertexList;
vtkCellArray* triangles = vtkCellArray::New();
vtkTriangle* triangle = vtkTriangle::New();
triangle->GetPointIds()->SetId(0, 0);
triangle->GetPointIds()->SetId(1, 1);
triangle->GetPointIds()->SetId(2, 2);
triangles->InsertNextCell(triangle);
vtkPolyData* polydata = vtkPolyData::New();


polydata->SetPoints(Points);
  //add the geometry and topology to the polydata
polydata->SetPolys(triangles);
  polydata->SetPoints ( points );
  polydata->SetPolys ( triangles );


vtkXMLPolyDataWriter* writer = vtkXMLPolyDataWriter::New();
  //write the polydata to a file
writer->SetFileName("Triangle.vtp");
  vtkSmartPointer<vtkXMLPolyDataWriter> writer = vtkSmartPointer<vtkXMLPolyDataWriter>::New();
writer->SetInput(polydata);
  writer->SetFileName ( "Triangle.vtp" );
writer->Write();
#if VTK_MAJOR_VERSION <= 5
  writer->SetInput ( polydata );
#else
  writer->SetInputData ( polydata );
#endif
  writer->Write();


  return EXIT_SUCCESS;
}
}
</source>
==CMakeLists.txt==
<source lang="cmake">
cmake_minimum_required(VERSION 2.6)
project(TrianglePolygon)
find_package(VTK REQUIRED)
include(${VTK_USE_FILE})
add_executable(TrianglePolygon TrianglePolygon.cxx)
if(VTK_LIBRARIES)
  target_link_libraries(TrianglePolygon ${VTK_LIBRARIES})
else()
  target_link_libraries(TrianglePolygon vtkHybrid)
endif()
</source>
</source>

Latest revision as of 19:29, 25 April 2014

TrianglePolygon.cxx

<source lang="cpp">

  1. include <vtkCellArray.h>
  2. include <vtkSmartPointer.h>
  3. include <vtkPoints.h>
  4. include <vtkXMLPolyDataWriter.h>
  5. include <vtkPolyData.h>
  6. include <vtkTriangle.h>

int main(int argc, char *argv[]) { 

 //setup points (geometry)
 vtkSmartPointer<vtkPoints> points = vtkSmartPointer<vtkPoints>::New();
 points->InsertNextPoint ( 1.0, 0.0, 0.0 );
 points->InsertNextPoint ( 0.0, 0.0, 0.0 );
 points->InsertNextPoint ( 0.0, 1.0, 0.0 );

 vtkSmartPointer<vtkCellArray> triangles = vtkSmartPointer<vtkCellArray>::New();

 //create a triangle on the three points in the polydata
 vtkSmartPointer<vtkTriangle> triangle = vtkSmartPointer<vtkTriangle>::New();

 //Unfortunately in this simple example the following lines are ambiguous.
 //The first 0 is the index of the triangle vertex which is ALWAYS 0-2.
 //The second 0 is the index into the point (geometry) array, so this can range from 0-(NumPoints-1)
 //i.e. a more general statement is triangle->GetPointIds()->SetId(0, PointId);
 triangle->GetPointIds()->SetId ( 0, 0 );
 triangle->GetPointIds()->SetId ( 1, 1 );
 triangle->GetPointIds()->SetId ( 2, 2 );

 //add the triangle to the list of triangles (in this case there is only 1)
 triangles->InsertNextCell ( triangle );

 //create a polydata object
 vtkSmartPointer<vtkPolyData> polydata = vtkSmartPointer<vtkPolyData>::New();

 //add the geometry and topology to the polydata
 polydata->SetPoints ( points );
 polydata->SetPolys ( triangles );

 //write the polydata to a file
 vtkSmartPointer<vtkXMLPolyDataWriter> writer = vtkSmartPointer<vtkXMLPolyDataWriter>::New();
 writer->SetFileName ( "Triangle.vtp" );
  1. if VTK_MAJOR_VERSION <= 5
 writer->SetInput ( polydata );
  1. else
 writer->SetInputData ( polydata );
  1. endif
 writer->Write();

 return EXIT_SUCCESS;

}

</source>

CMakeLists.txt

<source lang="cmake"> cmake_minimum_required(VERSION 2.6)

project(TrianglePolygon)

find_package(VTK REQUIRED) include(${VTK_USE_FILE})

add_executable(TrianglePolygon TrianglePolygon.cxx) if(VTK_LIBRARIES) 

 target_link_libraries(TrianglePolygon ${VTK_LIBRARIES})

else() 

 target_link_libraries(TrianglePolygon vtkHybrid)

endif()

</source>

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