CameraModel2

VTKEx/Cxx/Visualization/CameraModel2

Description

This example illustrates the camera movement centered at the camera position.

Note

For camera movement around the focal point see CameraModel1.

Note

This is an adaptation of the code written by Chung Kai Lun Pete.

Info

See Figure 3-13 in Chapter 3 the VTK Textbook.

Other languages

See (Python)

Question

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

Code

CameraModel2.cxx

/*
   Adaptation of the code by
        Author: Chung Kai Lun Peter
        Email: hkpeterpeter@gmail.com
        File:
            demo_vtk_camera_2.cpp
        Purpose:
                Ported from camera2.tcl.
                It illustrates the camera model of VTK.
*/

#include <vtkAppendPolyData.h>
#include <vtkCellArray.h>
#include <vtkConeSource.h>
#include <vtkContourFilter.h>
#include <vtkCubeSource.h>
#include <vtkDataSetMapper.h>
#include <vtkImplicitModeller.h>
#include <vtkLODActor.h>
#include <vtkPoints.h>
#include <vtkPolyData.h>
#include <vtkPolyDataMapper.h>
#include <vtkRenderWindow.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkRenderer.h>
#include <vtkRotationalExtrusionFilter.h>
#include <vtkSmartPointer.h>
#include <vtkSphereSource.h>
#include <vtkTextActor.h>
#include <vtkTextProperty.h>
#include <vtkTransform.h>
#include <vtkTransformFilter.h>
#include <vtkTransformPolyDataFilter.h>
#include <vtkWarpTo.h>

#include <vtkCamera.h>
#include <vtkNamedColors.h>
#include <vtkProperty.h>

#include <algorithm>
#include <array>

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

  vtkSmartPointer<vtkNamedColors> colors =
    vtkSmartPointer<vtkNamedColors>::New();

  // Set the colors.
  std::array<unsigned char , 4> azArrowColor{{255, 77, 77}};
    colors->SetColor("AzimuthArrowColor", azArrowColor.data());
  std::array<unsigned char , 4> elevArrowColor{{77, 255, 77}};
    colors->SetColor("ElevationArrowColor", elevArrowColor.data());
  std::array<unsigned char , 4> rollArrowColor{{255, 255, 77}};
    colors->SetColor("RollArrowColor", rollArrowColor.data());
  std::array<unsigned char , 4> spikeColor{{255, 77, 255}};
    colors->SetColor("SpikeColor", spikeColor.data());
  std::array<unsigned char , 4> upSpikeColor{{77, 255, 255}};
    colors->SetColor("UpSpikeColor", upSpikeColor.data());

  // create a camera model
  vtkSmartPointer<vtkConeSource> camCS = vtkSmartPointer<vtkConeSource>::New();
  camCS->SetHeight(1.5);
  camCS->SetResolution(12);
  camCS->SetRadius(0.4);

  vtkSmartPointer<vtkCubeSource> camCBS = vtkSmartPointer<vtkCubeSource>::New();
  camCBS->SetXLength(1.5);
  camCBS->SetZLength(0.8);
  camCBS->SetCenter(0.4, 0, 0);

  vtkSmartPointer<vtkAppendPolyData> camAPD =
    vtkSmartPointer<vtkAppendPolyData>::New();
  camAPD->AddInputConnection(camCBS->GetOutputPort());
  camAPD->AddInputConnection(camCS->GetOutputPort());

  vtkSmartPointer<vtkPolyDataMapper> camMapper =
    vtkSmartPointer<vtkPolyDataMapper>::New();
  camMapper->SetInputConnection(camAPD->GetOutputPort());
  vtkSmartPointer<vtkLODActor> camActor = vtkSmartPointer<vtkLODActor>::New();
  camActor->SetMapper(camMapper);
  camActor->SetScale(2, 2, 2);

  // draw the arrows
  vtkSmartPointer<vtkPolyData> pd = vtkSmartPointer<vtkPolyData>::New();
  vtkSmartPointer<vtkCellArray> ca = vtkSmartPointer<vtkCellArray>::New();
  vtkSmartPointer<vtkPoints> pts = vtkSmartPointer<vtkPoints>::New();
  pts->InsertNextPoint(0, 1, 0);
  pts->InsertNextPoint(8, 1, 0);
  pts->InsertNextPoint(8, 2, 0);
  pts->InsertNextPoint(10, 0, 0);
  pts->InsertNextPoint(8, -2, 0);
  pts->InsertNextPoint(8, -1, 0);
  pts->InsertNextPoint(0, -1, 0);
  ca->InsertNextCell(7);
  ca->InsertCellPoint(0);
  ca->InsertCellPoint(1);
  ca->InsertCellPoint(2);
  ca->InsertCellPoint(3);
  ca->InsertCellPoint(4);
  ca->InsertCellPoint(5);
  ca->InsertCellPoint(6);
  pd->SetPoints(pts);
  pd->SetPolys(ca);

  vtkSmartPointer<vtkPolyData> pd2 = vtkSmartPointer<vtkPolyData>::New();
  vtkSmartPointer<vtkCellArray> ca2 = vtkSmartPointer<vtkCellArray>::New();
  vtkSmartPointer<vtkPoints> pts2 = vtkSmartPointer<vtkPoints>::New();
  pts2->InsertNextPoint(0, 1, 0);
  pts2->InsertNextPoint(8, 1, 0);
  pts2->InsertNextPoint(8, 2, 0);
  pts2->InsertNextPoint(10, 0.01, 0);
  ca2->InsertNextCell(4);
  ca2->InsertCellPoint(0);
  ca2->InsertCellPoint(1);
  ca2->InsertCellPoint(2);
  ca2->InsertCellPoint(3);
  pd2->SetPoints(pts2);
  pd2->SetLines(ca2);

  vtkSmartPointer<vtkImplicitModeller> arrowIM =
    vtkSmartPointer<vtkImplicitModeller>::New();
  arrowIM->SetInputData(pd);
  arrowIM->SetSampleDimensions(50, 20, 8);

  vtkSmartPointer<vtkContourFilter> arrowCF =
    vtkSmartPointer<vtkContourFilter>::New();
  arrowCF->SetInputConnection(arrowIM->GetOutputPort());
  arrowCF->SetValue(0, 0.2);

  vtkSmartPointer<vtkWarpTo> arrowWT = vtkSmartPointer<vtkWarpTo>::New();
  arrowWT->SetInputConnection(arrowCF->GetOutputPort());
  arrowWT->SetPosition(5, 0, 5);
  arrowWT->SetScaleFactor(0.85);
  arrowWT->AbsoluteOn();

  vtkSmartPointer<vtkTransform> arrowT = vtkSmartPointer<vtkTransform>::New();
  arrowT->RotateY(60);
  arrowT->Translate(-1.33198, 0, -1.479);
  arrowT->Scale(1, 0.5, 1);

  vtkSmartPointer<vtkTransformFilter> arrowTF =
    vtkSmartPointer<vtkTransformFilter>::New();
  arrowTF->SetInputConnection(arrowWT->GetOutputPort());
  arrowTF->SetTransform(arrowT);

  vtkSmartPointer<vtkDataSetMapper> arrowMapper =
    vtkSmartPointer<vtkDataSetMapper>::New();
  arrowMapper->SetInputConnection(arrowTF->GetOutputPort());
  arrowMapper->ScalarVisibilityOff();

  // draw the azimuth arrows
  vtkSmartPointer<vtkLODActor> a1Actor = vtkSmartPointer<vtkLODActor>::New();
  a1Actor->SetMapper(arrowMapper);
  a1Actor->SetPosition(-9, 0, -1);
  a1Actor->GetProperty()->SetColor(
    colors->GetColor3d("AzimuthArrowColor").GetData());
  a1Actor->GetProperty()->SetSpecularColor(
    colors->GetColor3d("White").GetData());
  a1Actor->GetProperty()->SetSpecular(0.3);
  a1Actor->GetProperty()->SetSpecularPower(20);
  a1Actor->GetProperty()->SetAmbient(0.2);
  a1Actor->GetProperty()->SetDiffuse(0.8);

  vtkSmartPointer<vtkLODActor> a2Actor = vtkSmartPointer<vtkLODActor>::New();
  a2Actor->SetMapper(arrowMapper);
  a2Actor->RotateX(180);
  a2Actor->SetPosition(-9, 0, 1);
  a2Actor->GetProperty()->SetColor(
    colors->GetColor3d("AzimuthArrowColor").GetData());
  a2Actor->GetProperty()->SetSpecularColor(
    colors->GetColor3d("White").GetData());
  a2Actor->GetProperty()->SetSpecular(0.3);
  a2Actor->GetProperty()->SetSpecularPower(20);
  a2Actor->GetProperty()->SetAmbient(0.2);
  a2Actor->GetProperty()->SetDiffuse(0.8);

  // draw the elevation arrows
  vtkSmartPointer<vtkLODActor> a3Actor = vtkSmartPointer<vtkLODActor>::New();
  a3Actor->SetMapper(arrowMapper);
  a3Actor->RotateX(-90);
  a3Actor->SetPosition(-9, -1, 0);
  a3Actor->GetProperty()->SetColor(
    colors->GetColor3d("ElevationArrowColor").GetData());
  a3Actor->GetProperty()->SetSpecularColor(
    colors->GetColor3d("White").GetData());
  a3Actor->GetProperty()->SetSpecular(0.3);
  a3Actor->GetProperty()->SetSpecularPower(20);
  a3Actor->GetProperty()->SetAmbient(0.2);
  a3Actor->GetProperty()->SetDiffuse(0.8);

  vtkSmartPointer<vtkLODActor> a4Actor = vtkSmartPointer<vtkLODActor>::New();
  a4Actor->SetMapper(arrowMapper);
  a4Actor->RotateX(90);
  a4Actor->SetPosition(-9, 1, 0);
  a4Actor->GetProperty()->SetColor(
    colors->GetColor3d("ElevationArrowColor").GetData());
  a4Actor->GetProperty()->SetSpecularColor(
    colors->GetColor3d("White").GetData());
  a4Actor->GetProperty()->SetSpecular(0.3);
  a4Actor->GetProperty()->SetSpecularPower(20);
  a4Actor->GetProperty()->SetAmbient(0.2);
  a4Actor->GetProperty()->SetDiffuse(0.8);

  // draw the DOP
  vtkSmartPointer<vtkTransform> arrowT2 = vtkSmartPointer<vtkTransform>::New();
  arrowT2->Scale(1, 0.6, 1);
  arrowT2->RotateY(90);

  vtkSmartPointer<vtkTransformPolyDataFilter> arrowTF2 =
    vtkSmartPointer<vtkTransformPolyDataFilter>::New();
  arrowTF2->SetInputData(pd2);
  arrowTF2->SetTransform(arrowT2);

  vtkSmartPointer<vtkRotationalExtrusionFilter> arrowREF =
    vtkSmartPointer<vtkRotationalExtrusionFilter>::New();
  arrowREF->SetInputConnection(arrowTF2->GetOutputPort());
  arrowREF->CappingOff();
  arrowREF->SetResolution(30);

  vtkSmartPointer<vtkPolyDataMapper> spikeMapper =
    vtkSmartPointer<vtkPolyDataMapper>::New();
  spikeMapper->SetInputConnection(arrowREF->GetOutputPort());

  vtkSmartPointer<vtkLODActor> a5Actor = vtkSmartPointer<vtkLODActor>::New();
  a5Actor->SetMapper(spikeMapper);
  a5Actor->SetScale(0.3, 0.3, 0.6);
  a5Actor->RotateY(-90);
  a5Actor->SetPosition(-8, 0, 0);
  a5Actor->GetProperty()->SetColor(colors->GetColor3d("SpikeColor").GetData());
  a5Actor->GetProperty()->SetSpecularColor(
    colors->GetColor3d("White").GetData());
  a5Actor->GetProperty()->SetSpecular(0.3);
  a5Actor->GetProperty()->SetAmbient(0.2);
  a5Actor->GetProperty()->SetDiffuse(0.8);
  a5Actor->GetProperty()->SetSpecularPower(20);

  vtkSmartPointer<vtkLODActor> a7Actor = vtkSmartPointer<vtkLODActor>::New();
  a7Actor->SetMapper(spikeMapper);
  a7Actor->SetScale(0.2, 0.2, 0.7);
  a7Actor->RotateZ(90);
  a7Actor->RotateY(-90);
  a7Actor->SetPosition(-9, 1, 0);
  a7Actor->GetProperty()->SetColor(
    colors->GetColor3d("UpSpikeColor").GetData());
  a7Actor->GetProperty()->SetSpecularColor(
    colors->GetColor3d("White").GetData());
  a7Actor->GetProperty()->SetSpecular(0.3);
  a7Actor->GetProperty()->SetAmbient(0.2);
  a7Actor->GetProperty()->SetDiffuse(0.8);
  a7Actor->GetProperty()->SetSpecularPower(20);

  // focal point
  vtkSmartPointer<vtkSphereSource> ss = vtkSmartPointer<vtkSphereSource>::New();
  ss->SetRadius(0.5);
  vtkSmartPointer<vtkPolyDataMapper> fpMapper =
    vtkSmartPointer<vtkPolyDataMapper>::New();
  fpMapper->SetInputConnection(ss->GetOutputPort());
  vtkSmartPointer<vtkLODActor> fpActor = vtkSmartPointer<vtkLODActor>::New();
  fpActor->SetMapper(fpMapper);
  fpActor->SetPosition(-9, 0, 0);
  fpActor->GetProperty()->SetSpecularColor(
    colors->GetColor3d("White").GetData());
  fpActor->GetProperty()->SetSpecular(0.3);
  fpActor->GetProperty()->SetAmbient(0.2);
  fpActor->GetProperty()->SetDiffuse(0.8);
  fpActor->GetProperty()->SetSpecularPower(20);

  // create the roll arrows
  vtkSmartPointer<vtkWarpTo> arrowWT2 = vtkSmartPointer<vtkWarpTo>::New();
  arrowWT2->SetInputConnection(arrowCF->GetOutputPort());
  arrowWT2->SetPosition(5, 0, 2.5);
  arrowWT2->SetScaleFactor(0.95);
  arrowWT2->AbsoluteOn();

  vtkSmartPointer<vtkTransform> arrowT3 = vtkSmartPointer<vtkTransform>::New();
  arrowT3->Translate(-2.50358, 0, -1.70408);
  arrowT3->Scale(0.5, 0.3, 1);

  vtkSmartPointer<vtkTransformFilter> arrowTF3 =
    vtkSmartPointer<vtkTransformFilter>::New();
  arrowTF3->SetInputConnection(arrowWT2->GetOutputPort());
  arrowTF3->SetTransform(arrowT3);

  vtkSmartPointer<vtkDataSetMapper> arrowMapper2 =
    vtkSmartPointer<vtkDataSetMapper>::New();
  arrowMapper2->SetInputConnection(arrowTF3->GetOutputPort());
  arrowMapper2->ScalarVisibilityOff();

  // draw the roll arrows
  vtkSmartPointer<vtkLODActor> a6Actor = vtkSmartPointer<vtkLODActor>::New();
  a6Actor->SetMapper(arrowMapper2);
  a6Actor->RotateZ(90);
  a6Actor->SetPosition(-4, 0, 0);
  a6Actor->SetScale(1.5, 1.5, 1.5);
  a6Actor->GetProperty()->SetColor(
    colors->GetColor3d("RollArrowColor").GetData());
  a6Actor->GetProperty()->SetSpecularColor(
    colors->GetColor3d("White").GetData());
  a6Actor->GetProperty()->SetSpecular(0.3);
  a6Actor->GetProperty()->SetSpecularPower(20);
  a6Actor->GetProperty()->SetAmbient(0.2);
  a6Actor->GetProperty()->SetDiffuse(0.8);

  // Create the RenderWindow, Renderer and both Actors
  //
  vtkSmartPointer<vtkRenderer> ren1 = vtkSmartPointer<vtkRenderer>::New();
  vtkSmartPointer<vtkRenderWindow> renWin =
    vtkSmartPointer<vtkRenderWindow>::New();
  renWin->AddRenderer(ren1);
  vtkSmartPointer<vtkRenderWindowInteractor> iren =
    vtkSmartPointer<vtkRenderWindowInteractor>::New();
  iren->SetRenderWindow(renWin);

  // Add the actors to the renderer, set the background and size
  ren1->AddActor(camActor);
  ren1->AddActor(a1Actor);
  ren1->AddActor(a2Actor);
  ren1->AddActor(a3Actor);
  ren1->AddActor(a4Actor);
  ren1->AddActor(a5Actor);
  ren1->AddActor(a6Actor);
  ren1->AddActor(a7Actor);
  ren1->AddActor(fpActor);
  ren1->SetBackground(colors->GetColor3d("SlateGray").GetData());
  renWin->SetSize(640, 480);

  // render the image

  vtkCamera* cam1 = (ren1->GetActiveCamera());
  ren1->ResetCamera();
  cam1->Azimuth(150);
  cam1->Elevation(30);
  cam1->Dolly(1.5);
  ren1->ResetCameraClippingRange();

  // Create a TextActor for Yaw  (a1 and a2 actor's color)
  vtkSmartPointer<vtkTextActor> text = vtkSmartPointer<vtkTextActor>::New();
  text->SetInput("Yaw");
  vtkTextProperty* tprop = text->GetTextProperty();
  tprop->SetFontFamilyToArial();
  tprop->ShadowOff();
  tprop->SetLineSpacing(1.0);
  tprop->SetFontSize(36);
  tprop->SetColor(a1Actor->GetProperty()->GetColor());
  text->SetDisplayPosition(20, 50);
  ren1->AddActor2D(text);

  // Create a TextActor for Pitch  (a3 and a4 actor's color)
  vtkSmartPointer<vtkTextActor> text2 = vtkSmartPointer<vtkTextActor>::New();
  text2->SetInput("Pitch");
  tprop = text2->GetTextProperty();
  tprop->SetFontFamilyToArial();
  tprop->ShadowOff();
  tprop->SetLineSpacing(1.0);
  tprop->SetFontSize(36);
  tprop->SetColor(a3Actor->GetProperty()->GetColor());
  text2->SetDisplayPosition(20, 100);
  ren1->AddActor2D(text2);

  // Create a TextActor for roll (a6 actor's color)
  vtkSmartPointer<vtkTextActor> text3 = vtkSmartPointer<vtkTextActor>::New();
  text3->SetInput("Roll");
  tprop = text3->GetTextProperty();
  tprop->SetFontFamilyToArial();
  tprop->ShadowOff();
  tprop->SetLineSpacing(1.0);
  tprop->SetFontSize(36);
  tprop->SetColor(a6Actor->GetProperty()->GetColor());
  text3->SetDisplayPosition(20, 150);
  ren1->AddActor2D(text3);

  renWin->Render();
  iren->Initialize();
  iren->Start();

  return EXIT_SUCCESS;
}

CMakeLists.txt

cmake_minimum_required(VERSION 3.3 FATAL_ERROR)

project(CameraModel2)

find_package(VTK COMPONENTS 
  vtkvtkCommonColor
  vtkvtkCommonCore
  vtkvtkCommonDataModel
  vtkvtkCommonTransforms
  vtkvtkFiltersCore
  vtkvtkFiltersGeneral
  vtkvtkFiltersHybrid
  vtkvtkFiltersModeling
  vtkvtkFiltersSources
  vtkvtkInteractionStyle
  vtkvtkRenderingContextOpenGL2
  vtkvtkRenderingCore
  vtkvtkRenderingFreeType
  vtkvtkRenderingGL2PSOpenGL2
  vtkvtkRenderingLOD
  vtkvtkRenderingOpenGL2 QUIET)
if (NOT VTK_FOUND)
  message("Skipping CameraModel2: ${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(CameraModel2 MACOSX_BUNDLE CameraModel2.cxx )
  target_link_libraries(CameraModel2 PRIVATE ${VTK_LIBRARIES})
else ()
  # include all components
  add_executable(CameraModel2 MACOSX_BUNDLE CameraModel2.cxx )
  target_link_libraries(CameraModel2 PRIVATE ${VTK_LIBRARIES})
  # vtk_module_autoinit is needed
  vtk_module_autoinit(
    TARGETS CameraModel2
    MODULES ${VTK_LIBRARIES}
    )
endif ()

Download and Build CameraModel2

Click here to download CameraModel2 and its CMakeLists.txt file. Once the tarball CameraModel2.tar has been downloaded and extracted,

cd CameraModel2/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:

./CameraModel2

WINDOWS USERS

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