ProgrammableSource
VTKExamples/Cxx/Filtering/ProgrammableSource
Description
Use a programmable source to generate the points for the Lorenz System
Code
ProgrammableSource.cxx
#include <vtkVersion.h>
#include "vtkSmartPointer.h"
#include "vtkProgrammableSource.h"
#include "vtkPolyData.h"
#include "vtkVertexGlyphFilter.h"
#include "vtkPoints.h"
#include <vtkPolyDataMapper.h>
#include <vtkActor.h>
#include <vtkRenderWindow.h>
#include <vtkRenderer.h>
#include <vtkRenderWindowInteractor.h>
// https://en.wikipedia.org/wiki/Lorenz_system
static void Lorenz(void *arg)
{
double sigma = 10.0; /* The Lorenz paramaters */
double beta = 8.0 / 3.0;
double rho = 28.0;
double h = .001; /* Integration step size */
double x, y, z;
double xx, yy, zz;
x = 0.1;
y = 0.1;
z = 0.1;
vtkSmartPointer<vtkPoints> points =
vtkSmartPointer<vtkPoints>::New();
// Get to a stable starting point
for (int i = 0; i < 1000; ++i)
{
xx = x + h * sigma * (y - x);
yy = y + h * (x * (rho - z) - y);
zz = z + h * (x * y - (beta * z));
x = xx; y = yy; z = zz;
}
for (int i = 0; i < 500000; ++i)
{
xx = x + h * sigma * (y - x);
yy = y + h * (x * (rho - z) - y);
zz = z + h * (x * y - (beta * z));
points->InsertNextPoint(xx, yy, zz);
x = xx; y = yy; z = zz;
}
vtkSmartPointer<vtkPolyData> pointsPolydata =
vtkSmartPointer<vtkPolyData>::New();
pointsPolydata->SetPoints(points);
vtkSmartPointer<vtkVertexGlyphFilter> vertexFilter =
vtkSmartPointer<vtkVertexGlyphFilter>::New();
#if VTK_MAJOR_VERSION <= 5
vertexFilter->SetInputConnection(pointsPolydata->GetProducerPort());
#else
vertexFilter->SetInputData(pointsPolydata);
#endif
vertexFilter->Update();
vtkProgrammableSource * ps =
static_cast<vtkProgrammableSource *>(arg);
vtkPolyData *output = ps->GetPolyDataOutput();
output->DeepCopy(vertexFilter->GetOutput());
}
int main (int, char *[])
{
vtkSmartPointer<vtkProgrammableSource> source =
vtkSmartPointer<vtkProgrammableSource>::New();
source->SetExecuteMethod(Lorenz, source);
source->Update();
vtkSmartPointer<vtkPolyDataMapper> mapper =
vtkSmartPointer<vtkPolyDataMapper>::New();
#if VTK_MAJOR_VERSION <= 5
mapper->SetInput(source->GetPolyDataOutput());
#else
mapper->SetInputData(source->GetPolyDataOutput());
#endif
vtkSmartPointer<vtkActor> actor =
vtkSmartPointer<vtkActor>::New();
actor->SetMapper(mapper);
// Setup render window, renderer, 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);
renderer->AddActor(actor);
renderer->SetBackground(.4, .5, .7);
renderWindow->Render();
renderWindowInteractor->Start();
return EXIT_SUCCESS;
}
CMakeLists.txt
cmake_minimum_required(VERSION 2.8)
PROJECT(ProgrammableSource)
find_package(VTK REQUIRED)
include(${VTK_USE_FILE})
add_executable(ProgrammableSource MACOSX_BUNDLE ProgrammableSource.cxx)
target_link_libraries(ProgrammableSource ${VTK_LIBRARIES})
Download and Build ProgrammableSource
Click here to download ProgrammableSource and its CMakeLists.txt file. Once the tarball ProgrammableSource.tar has been downloaded and extracted,
cd ProgrammableSource/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:
./ProgrammableSource
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.