CameraModel2

VTKExamples/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 example corresponds to Figure 3-13 in the VTK Text.

Note

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

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);

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

  return EXIT_SUCCESS;
}

CMakeLists.txt

cmake_minimum_required(VERSION 2.8)

PROJECT(CameraModel2)

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

add_executable(CameraModel2 MACOSX_BUNDLE CameraModel2.cxx )

target_link_libraries(CameraModel2 ${VTK_LIBRARIES})

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.