自定义vtkActor动画场景及事件

开发环境：

Windows 11 家庭中文版
Microsoft Visual Studio Community 2019
VTK-9.3.0.rc0
vtk-example
参考代码

demo解决问题：自定义vtkActor动画场景及事件

vtkAnimationScene表示动画的场景或设置，它由单个线索或其他场景组成，设置动画场景的开始时间，结束时间，添加监听事件类型vtkCommand::AnimationCueTickEvent。因为scene->SetEndTime(20)短于cue1->SetEndTime(23);，所以很明显看到动画最后第二十秒的时候，scene动画事件结束了，tick事件不起作用了，sphere没有平滑移动，最后变成了结束事件vtkCommand::EndAnimationCueEvent，sphere直接移动到了最终的位置

cpp

  scene->SetLoop(0);//Enable/Disable animation loop.
  scene->SetFrameRate(5);
  scene->SetStartTime(0);
  scene->SetEndTime(20);
  scene->AddObserver(vtkCommand::AnimationCueTickEvent, renWin.GetPointer(),
                     &vtkWindow::Render);

vtkAnimationCue表示随时间变化/动画的实体，设置开始事件、结束时间，并添加到动画场景中AddCue

cpp

  // Create an Animation Cue for each actor
  vtkNew<vtkAnimationCue> cue1;
  cue1->SetStartTime(5);
  cue1->SetEndTime(23);
  scene->AddCue(cue1);

  vtkNew<vtkAnimationCue> cue2;
  cue2->SetStartTime(1);
  cue2->SetEndTime(10);
  scene->AddCue(cue2);

ActorAnimator ：自定义根据时间（开始时间、结束时间、中间滴答时间）vtkActor变换，添加对应时间到cue的观察者列表中

cpp

  void AddObserversToCue(vtkAnimationCue* cue)
  {
    cue->AddObserver(vtkCommand::StartAnimationCueEvent, this,
                     &ActorAnimator::Start);
    cue->AddObserver(vtkCommand::EndAnimationCueEvent, this,
                     &ActorAnimator::End);
    cue->AddObserver(vtkCommand::AnimationCueTickEvent, this,
                     &ActorAnimator::Tick);
  }

prj name: AnimateActors

cpp

# include "AnimateActors.h"

# include <vtkAnimationCue.h>
# include <vtkAnimationScene.h>
# include <vtkCamera.h>
# include <vtkCommand.h>
# include <vtkConeSource.h>
# include <vtkLogger.h>
# include <vtkNamedColors.h>
# include <vtkNew.h>
# include <vtkPolyDataMapper.h>
# include <vtkProperty.h>
# include <vtkRenderWindow.h>
# include <vtkRenderWindowInteractor.h>
# include <vtkRenderer.h>
# include <vtkSphereSource.h>

int main(int argc, char* argv[])
{
  vtkLogger::Init(argc, argv);

  // Colors
  vtkNew<vtkNamedColors> colors;
  vtkColor3d coneColor = colors->GetColor3d("Tomato");
  vtkColor3d sphereColor = colors->GetColor3d("Banana");
  vtkColor3d backgroundColor = colors->GetColor3d("Peacock");

  // Create the graphics structure. The renderer renders into the
  // render window.
  vtkNew<vtkRenderWindowInteractor> iren;
  vtkNew<vtkRenderer> ren1;
  ren1->SetBackground(backgroundColor.GetData());

  vtkNew<vtkRenderWindow> renWin;
  iren->SetRenderWindow(renWin);
  renWin->AddRenderer(ren1);

  // Generate a sphere
  vtkNew<vtkSphereSource> sphereSource;
  sphereSource->SetPhiResolution(31);
  sphereSource->SetThetaResolution(31);

  vtkNew<vtkPolyDataMapper> sphereMapper;
  sphereMapper->SetInputConnection(sphereSource->GetOutputPort());
  vtkNew<vtkActor> sphere;
  sphere->SetMapper(sphereMapper);
  sphere->GetProperty()->SetDiffuseColor(sphereColor.GetData());
  sphere->GetProperty()->SetDiffuse(.7);
  sphere->GetProperty()->SetSpecular(.3);
  sphere->GetProperty()->SetSpecularPower(30.0);

  ren1->AddActor(sphere);

  // Generate a cone
  vtkNew<vtkConeSource> coneSource;
  coneSource->SetResolution(31);

  vtkNew<vtkPolyDataMapper> coneMapper;
  coneMapper->SetInputConnection(coneSource->GetOutputPort());
  // auto cone = vtkSmartPointer<vtkActor>::New();
  vtkNew<vtkActor> cone;
  cone->SetMapper(coneMapper);
  cone->GetProperty()->SetDiffuseColor(coneColor.GetData());

  ren1->AddActor(cone);

  // Create an Animation Scene
  vtkNew<vtkAnimationScene> scene;
  if (argc >= 2 && strcmp(argv[1], "-real") == 0)
  {
    vtkLogF(INFO, "real-time mode");
    scene->SetModeToRealTime();
  }
  else
  {
    vtkLogF(INFO, "sequence mode");
    scene->SetModeToSequence();
  }
  scene->SetLoop(0);
  scene->SetFrameRate(5);
  scene->SetStartTime(0);
  scene->SetEndTime(20);
  scene->AddObserver(vtkCommand::AnimationCueTickEvent, renWin.GetPointer(),
                     &vtkWindow::Render);

  // Create an Animation Cue for each actor
  vtkNew<vtkAnimationCue> cue1;
  cue1->SetStartTime(5);
  cue1->SetEndTime(23);
  scene->AddCue(cue1);

  vtkNew<vtkAnimationCue> cue2;
  cue2->SetStartTime(1);
  cue2->SetEndTime(10);
  scene->AddCue(cue2);

  // Create an ActorAnimator for each actor;
  ActorAnimator animateSphere;
  animateSphere.SetActor(sphere);
  animateSphere.AddObserversToCue(cue1);

  ActorAnimator animateCone;
  animateCone.SetEndPosition(vtkVector3d(-1, -1, -1));
  animateCone.SetActor(cone);
  animateCone.AddObserversToCue(cue2);

  renWin->SetWindowName("AnimateActors");

  renWin->Render();
  ren1->ResetCamera();
  ren1->GetActiveCamera()->Dolly(.5);
  ren1->ResetCameraClippingRange();

  // Create Cue observer.
  scene->Play();
  scene->Stop();

  iren->Start();
  return EXIT_SUCCESS;
}

自定义vtkActor动画场景及事件 ​

自定义vtkActor动画场景及事件