VTK/Examples/Cxx/SimpleOperations/UniformRandomNumber

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This example generates 3 random numbers between 0 and 2 from a uniform distribution.

UniformRandomNumber.cxx

#include <vtkMath.h>
#include <time.h>

int main(int, char *[])
{
  // Set the number of random numbers we wish to produce to 3.
  unsigned int numRand = 3;
  
  // Without this line, the random numbers will be the same every iteration.
  vtkMath::RandomSeed(time(NULL));
  
  // Generate numRand random numbers from a uniform distribution between 0.0 and 2.0
  for(unsigned int i = 0; i < numRand; i++)
    {
    double a = vtkMath::Random(0.0,2.0);
    std::cout << a << std::endl;
    }
  
  return EXIT_SUCCESS;
}

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CMakeLists.txt

cmake_minimum_required(VERSION 2.8)

PROJECT(UniformRandomNumber)

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

add_executable(UniformRandomNumber MACOSX_BUNDLE UniformRandomNumber.cxx)

if(VTK_LIBRARIES)
  target_link_libraries(UniformRandomNumber ${VTK_LIBRARIES})
else()
  target_link_libraries(UniformRandomNumber vtkHybrid vtkWidgets)
endif()

Download and Build UniformRandomNumber

Click here to download UniformRandomNumber. and its CMakeLists.txt file.

Once the tarball UniformRandomNumber.tar has been downloaded and extracted,

cd UniformRandomNumber/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:

./UniformRandomNumber

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.