HyperStreamline

VTKExamples/Cxx/VisualizationAlgorithms/HyperStreamline


Description

This is an example of hyperstreamlines. The data is from a point load applied to semi-infinite domain. Compare this image to TensorEllipsoids that used tensor ellipsoids to visualize the same data. Notice that there is less clutter and more information available from the hyperstreamline visualization.

Code

HyperStreamline.cxx

#include <vtkActor.h>
#include <vtkCamera.h>
#include <vtkConeSource.h>
#include <vtkHyperStreamline.h>
#include <vtkImageData.h>
#include <vtkImageDataGeometryFilter.h>
#include <vtkLogLookupTable.h>
#include <vtkNamedColors.h>
#include <vtkOutlineFilter.h>
#include <vtkPointLoad.h>
#include <vtkPolyDataMapper.h>
#include <vtkProperty.h>
#include <vtkRenderWindow.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkRenderer.h>

int main (int, char *[])
{
// Create the RenderWindow, Renderer and interactive renderer
//
  vtkSmartPointer<vtkNamedColors> colors =
    vtkSmartPointer<vtkNamedColors>::New();

  vtkSmartPointer<vtkRenderer> ren1 =
    vtkSmartPointer<vtkRenderer>::New();
  vtkSmartPointer<vtkRenderWindow> renWin =
    vtkSmartPointer<vtkRenderWindow>::New();
  renWin->SetMultiSamples(0);
  renWin->AddRenderer(ren1);

  vtkSmartPointer<vtkRenderWindowInteractor> iren =
    vtkSmartPointer<vtkRenderWindowInteractor>::New();
  iren->SetRenderWindow(renWin);

//set VTK_INTEGRATE_BOTH_DIRECTIONS 2

//
// generate tensors
  vtkSmartPointer<vtkPointLoad> ptLoad =
    vtkSmartPointer<vtkPointLoad>::New();
  ptLoad->SetLoadValue(100.0);
  ptLoad->SetSampleDimensions(20, 20, 20);
  ptLoad->ComputeEffectiveStressOn();
  ptLoad->SetModelBounds(-10, 10, -10, 10, -10, 10);
  ptLoad->Update();

// Generate hyperstreamlines
  vtkSmartPointer<vtkHyperStreamline> s1 =
    vtkSmartPointer<vtkHyperStreamline>::New();
  s1->SetInputData(ptLoad->GetOutput());
  s1->SetStartPosition(9, 9, -9);
  s1->IntegrateMinorEigenvector();
  s1->SetMaximumPropagationDistance(18.0);
  s1->SetIntegrationStepLength(0.1);
  s1->SetStepLength(0.01);
  s1->SetRadius(0.25);
  s1->SetNumberOfSides(18);
  s1->SetIntegrationDirectionToIntegrateBothDirections();
  s1->Update();

// Map hyperstreamlines
  vtkSmartPointer<vtkLogLookupTable> lut =
    vtkSmartPointer<vtkLogLookupTable>::New();
  lut->SetHueRange(.6667, 0.0);

  vtkSmartPointer<vtkPolyDataMapper> s1Mapper =
    vtkSmartPointer<vtkPolyDataMapper>::New();
  s1Mapper->SetInputConnection(s1->GetOutputPort());
  s1Mapper->SetLookupTable(lut);
  s1Mapper->SetScalarRange(ptLoad->GetOutput()->GetScalarRange());

  vtkSmartPointer<vtkActor> s1Actor =
    vtkSmartPointer<vtkActor>::New();
  s1Actor->SetMapper(s1Mapper);

  vtkSmartPointer<vtkHyperStreamline> s2 =
    vtkSmartPointer<vtkHyperStreamline>::New();
  s2->SetInputData(ptLoad->GetOutput());
  s2->SetStartPosition(-9, -9, -9);
  s2->IntegrateMinorEigenvector();
  s2->SetMaximumPropagationDistance(18.0);
  s2->SetIntegrationStepLength(0.1);
  s2->SetStepLength(0.01);
  s2->SetRadius(0.25);
  s2->SetNumberOfSides(18);
  s2->SetIntegrationDirectionToIntegrateBothDirections();
  s2->Update();

  vtkSmartPointer<vtkPolyDataMapper> s2Mapper =
    vtkSmartPointer<vtkPolyDataMapper>::New();
  s2Mapper->SetInputConnection(s2->GetOutputPort());
  s2Mapper->SetLookupTable(lut);
  s2Mapper->SetScalarRange(ptLoad->GetOutput()->GetScalarRange());

  vtkSmartPointer<vtkActor> s2Actor =
    vtkSmartPointer<vtkActor>::New();
  s2Actor->SetMapper(s2Mapper);

  vtkSmartPointer<vtkHyperStreamline> s3 =
    vtkSmartPointer<vtkHyperStreamline>::New();
  s3->SetInputData(ptLoad->GetOutput());
  s3->SetStartPosition(9, -9, -9);
  s3->IntegrateMinorEigenvector();
  s3->SetMaximumPropagationDistance(18.0);
  s3->SetIntegrationStepLength(0.1);
  s3->SetStepLength(0.01);
  s3->SetRadius(0.25);
  s3->SetNumberOfSides(18);
  s3->SetIntegrationDirectionToIntegrateBothDirections();
  s3->Update();

  vtkSmartPointer<vtkPolyDataMapper> s3Mapper =
    vtkSmartPointer<vtkPolyDataMapper>::New();
  s3Mapper->SetInputConnection(s3->GetOutputPort());
  s3Mapper->SetLookupTable(lut);
  s3Mapper->SetScalarRange(ptLoad->GetOutput()->GetScalarRange());

  vtkSmartPointer<vtkActor> s3Actor =
    vtkSmartPointer<vtkActor>::New();
  s3Actor->SetMapper(s3Mapper);

  vtkSmartPointer<vtkHyperStreamline> s4 =
    vtkSmartPointer<vtkHyperStreamline>::New();
  s4->SetInputData(ptLoad->GetOutput());
  s4->SetStartPosition(-9, 9, -9);
  s4->IntegrateMinorEigenvector();
  s4->SetMaximumPropagationDistance(18.0);
  s4->SetIntegrationStepLength(0.1);
  s4->SetStepLength(0.01);
  s4->SetRadius(0.25);
  s4->SetNumberOfSides(18);
  s4->SetIntegrationDirectionToIntegrateBothDirections();
  s4->Update();

  vtkSmartPointer<vtkPolyDataMapper> s4Mapper =
    vtkSmartPointer<vtkPolyDataMapper>::New();
  s4Mapper->SetInputConnection(s4->GetOutputPort());
  s4Mapper->SetLookupTable(lut);
  s4Mapper->SetScalarRange(ptLoad->GetOutput()->GetScalarRange());

  vtkSmartPointer<vtkActor> s4Actor =
    vtkSmartPointer<vtkActor>::New();
  s4Actor->SetMapper(s4Mapper);

// plane for context
//
  vtkSmartPointer<vtkImageDataGeometryFilter> g =
    vtkSmartPointer<vtkImageDataGeometryFilter>::New();
  g->SetInputData(ptLoad->GetOutput());
  g->SetExtent(0, 100, 0, 100, 0, 0);
  g->Update(); //for scalar range

  vtkSmartPointer<vtkPolyDataMapper> gm =
    vtkSmartPointer<vtkPolyDataMapper>::New();
  gm->SetInputConnection(g->GetOutputPort());
  gm->SetScalarRange(g->GetOutput()->GetScalarRange());

  vtkSmartPointer<vtkActor> ga =
    vtkSmartPointer<vtkActor>::New();
  ga->SetMapper(gm);

// Create outline around data
//
  vtkSmartPointer<vtkOutlineFilter> outline =
    vtkSmartPointer<vtkOutlineFilter>::New();
  outline->SetInputData(ptLoad->GetOutput());

  vtkSmartPointer<vtkPolyDataMapper> outlineMapper =
    vtkSmartPointer<vtkPolyDataMapper>::New();
  outlineMapper->SetInputConnection(outline->GetOutputPort());

  vtkSmartPointer<vtkActor> outlineActor =
    vtkSmartPointer<vtkActor>::New();
  outlineActor->SetMapper(outlineMapper);
  outlineActor->GetProperty()->SetColor(colors->GetColor3d("Black").GetData());

// Create cone indicating application of load
//
  vtkSmartPointer<vtkConeSource> coneSrc =
    vtkSmartPointer<vtkConeSource>::New();
  coneSrc->SetRadius(.5);
  coneSrc->SetHeight(2);

  vtkSmartPointer<vtkPolyDataMapper> coneMap =
    vtkSmartPointer<vtkPolyDataMapper>::New();
  coneMap->SetInputConnection(coneSrc->GetOutputPort());

  vtkSmartPointer<vtkActor> coneActor =
    vtkSmartPointer<vtkActor>::New();
  coneActor->SetMapper(coneMap);
  coneActor->SetPosition(0, 0, 11);
  coneActor->RotateY(90);
  coneActor->GetProperty()->SetColor(colors->GetColor3d("Tomato").GetData());

  vtkSmartPointer<vtkCamera> camera =
    vtkSmartPointer<vtkCamera>::New();
  camera->SetFocalPoint(0.113766, -1.13665, -1.01919);
  camera->SetPosition(-29.4886, -63.1488, 26.5807);
  camera->SetViewAngle(24.4617);
  camera->SetViewUp(0.17138, 0.331163, 0.927879);
  camera->SetClippingRange(1, 100);

  ren1->AddActor(s1Actor);
  ren1->AddActor(s2Actor);
  ren1->AddActor(s3Actor);
  ren1->AddActor(s4Actor);
  ren1->AddActor(outlineActor);
  ren1->AddActor(coneActor);
  ren1->AddActor(ga);
  ren1->SetBackground(colors->GetColor3d("SlateGray").GetData());
  ren1->SetActiveCamera(camera);

  renWin->SetSize(640, 480);
  renWin->Render();
  iren->Start();

  return EXIT_SUCCESS;
}

CMakeLists.txt

cmake_minimum_required(VERSION 2.8)

PROJECT(HyperStreamline)

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

add_executable(HyperStreamline MACOSX_BUNDLE HyperStreamline.cxx )

target_link_libraries(HyperStreamline ${VTK_LIBRARIES})

Download and Build HyperStreamline

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

cd HyperStreamline/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:

./HyperStreamline

WINDOWS USERS

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