RandomSequence

VTKExamples/Cxx/SimpleOperations/RandomSequence

Description

This is the "new" (December, 2009) VTK way to produce random numbers. It is actually a random sequence generator.

Other Languages

See (Java), (CSharp)

Question

If you have a simple question about this example contact us at VTKExamplesProject If your question is more complex and may require extended discussion, please use the VTK Discourse Forum

Code

RandomSequence.cxx

#include <vtkMinimalStandardRandomSequence.h>
#include <vtkSmartPointer.h>

int main(int, char *[])
{
  //Create a random sequence generator.
  vtkSmartPointer<vtkMinimalStandardRandomSequence> sequence = 
      vtkSmartPointer<vtkMinimalStandardRandomSequence>::New();

  // initialize the sequence
  sequence->SetSeed(1);

  //Get 3 random numbers.
  double x = sequence->GetValue();
  sequence->Next();
  double y = sequence->GetValue();
  sequence->Next();
  double z = sequence->GetValue();

  // You can also use seq->GetRangeValue(-1.0,1.0); 
  //to set a range on the random values.

  //Output the resulting random numbersl
  std::cout << "x: " << x << " y: " << y << " z: " << z << std::endl;

  return EXIT_SUCCESS;
}

CMakeLists.txt

cmake_minimum_required(VERSION 3.3 FATAL_ERROR)

project(RandomSequence)

find_package(VTK COMPONENTS 
  vtkCommonCore QUIET)
if (NOT VTK_FOUND)
  message("Skipping RandomSequence: ${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(RandomSequence MACOSX_BUNDLE RandomSequence.cxx )
  target_link_libraries(RandomSequence PRIVATE ${VTK_LIBRARIES})
else ()
  # include all components
  add_executable(RandomSequence MACOSX_BUNDLE RandomSequence.cxx )
  target_link_libraries(RandomSequence PRIVATE ${VTK_LIBRARIES})
  # vtk_module_autoinit is needed
  vtk_module_autoinit(
    TARGETS RandomSequence
    MODULES ${VTK_LIBRARIES}
    )
endif () 

Download and Build RandomSequence

Click here to download RandomSequence and its CMakeLists.txt file. Once the tarball RandomSequence.tar has been downloaded and extracted,

cd RandomSequence/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:

./RandomSequence

WINDOWS USERS

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