CameraModel1

VTKExamples/Cxx/Visualization/CameraModel1

Description

This example illustrates the camera movement around the focal point.

Note

For camera movement centered at the camera position see CameraModel2.

Note

This example corresponds to Figure 3-12 in the VTK Text.

Note

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

Code

CameraModel1.cxx

/*
   Adaptation of the code by
    Author: Chung Kai Lun Peter
    Email: hkpeterpeter@gmail.com
    File:
        demo_vtk_camera_1.cpp
    Purpose:
        Ported from camera.tcl from the VTK textbook.
                It illustrates the camera model of VTK.
*/

#include <vtkSmartPointer.h>

#include <vtkAppendFilter.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 <vtkSphereSource.h>
#include <vtkTransform.h>
#include <vtkTransformFilter.h>
#include <vtkTransformPolyDataFilter.h>
#include <vtkWarpTo.h>
#include <vtkTextActor.h>
#include <vtkTextProperty.h>

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

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

  // 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);

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

  vtkSmartPointer<vtkDataSetMapper> camMapper =
    vtkSmartPointer<vtkDataSetMapper>::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> fp =
    vtkSmartPointer<vtkPoints>::New();
  fp->InsertNextPoint(0, 1, 0);
  fp->InsertNextPoint(8, 1, 0);
  fp->InsertNextPoint(8, 2, 0);
  fp->InsertNextPoint(10, 0.01, 0);
  fp->InsertNextPoint(8, -2, 0);
  fp->InsertNextPoint(8, -1, 0);
  fp->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(fp);
  pd->SetPolys(ca);

  vtkSmartPointer<vtkPolyData> pd2 =
    vtkSmartPointer<vtkPolyData>::New();
  vtkSmartPointer<vtkCellArray> ca2 =
    vtkSmartPointer<vtkCellArray>::New();
  vtkSmartPointer<vtkPoints> fp2 =
    vtkSmartPointer<vtkPoints>::New();
  fp2->InsertNextPoint(0, 1, 0);
  fp2->InsertNextPoint(8, 1, 0);
  fp2->InsertNextPoint(8, 2, 0);
  fp2->InsertNextPoint(10, 0.01, 0);
  ca2->InsertNextCell(4);
  ca2->InsertCellPoint(0);
  ca2->InsertCellPoint(1);
  ca2->InsertCellPoint(2);
  ca2->InsertCellPoint(3);
  pd2->SetPoints(fp2);
  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->RotateZ(180);
  a1Actor->SetPosition(1, 0, -1);
  a1Actor->GetProperty()->SetColor(1,0.3, 0.3);
  a1Actor->GetProperty()->SetSpecularColor(1,1, 1);
  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->RotateZ(180);
  a2Actor->RotateX(180);
  a2Actor->SetPosition(1, 0, 1);
  a2Actor->GetProperty()->SetColor(1,0.3, 0.3);
  a2Actor->GetProperty()->SetSpecularColor(1,1, 1);
  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->RotateZ(180);
  a3Actor->RotateX(90);
  a3Actor->SetPosition(1, -1, 0);
  a3Actor->GetProperty()->SetColor(0.3,1, 0.3);
  a3Actor->GetProperty()->SetSpecularColor(1,1, 1);
  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->RotateZ(180);
  a4Actor->RotateX(-90);
  a4Actor->SetPosition(1, 1, 0);
  a4Actor->GetProperty()->SetColor(0.3,1, 0.3);
  a4Actor->GetProperty()->SetSpecularColor(1,1, 1);
  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(.3, .3, .6);
  a5Actor->RotateY(90);
  a5Actor->SetPosition(-2, 0, 0);
  a5Actor->GetProperty()->SetColor(1,0.3, 1);
  a5Actor->GetProperty()->SetAmbient(0.2);
  a5Actor->GetProperty()->SetDiffuse(0.8);

  // focal point
  vtkSmartPointer<vtkSphereSource> fps =
    vtkSmartPointer<vtkSphereSource>::New();
  fps->SetRadius(0.5);
  vtkSmartPointer<vtkPolyDataMapper> fpMapper =
    vtkSmartPointer<vtkPolyDataMapper>::New();
  fpMapper->SetInputConnection(fps->GetOutputPort());
  vtkSmartPointer<vtkLODActor> fpActor =
    vtkSmartPointer<vtkLODActor>::New();
  fpActor->SetMapper(fpMapper);
  fpActor->SetPosition(-9, 0, 0);
  fpActor->GetProperty()->SetSpecularColor(1,1, 1);
  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(1,1, 0.3);
  a6Actor->GetProperty()->SetSpecularColor(1,1, 1);
  a6Actor->GetProperty()->SetSpecular(0.3);
  a6Actor->GetProperty()->SetSpecularPower(20);
  a6Actor->GetProperty()->SetAmbient(0.2);
  a6Actor->GetProperty()->SetDiffuse(0.8);

  // 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(fpActor);
  ren1->SetBackground(0.1, 0.2, 0.4);
  ren1->SetBackground (0.4392,0.5020,0.5647);
  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 azimuth  (a1 and a2 actor's color)
  vtkSmartPointer<vtkTextActor> text =
    vtkSmartPointer<vtkTextActor>::New();
  text->SetInput("Azimuth");
  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 elevation  (a3 and a4 actor's color)
  vtkSmartPointer<vtkTextActor> text2 =
    vtkSmartPointer<vtkTextActor>::New();
  text2->SetInput("Elevation");
  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(CameraModel1)

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

add_executable(CameraModel1 MACOSX_BUNDLE CameraModel1.cxx )

target_link_libraries(CameraModel1 ${VTK_LIBRARIES})

Download and Build CameraModel1

Click here to download CameraModel1 and its CMakeLists.txt file. Once the tarball CameraModel1.tar has been downloaded and extracted,

cd CameraModel1/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:

./CameraModel1

WINDOWS USERS

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