vtk 9.0 で表示(6) ライトを追加

//VTK_MODULE_INITに必要
#include <vtkAutoInit.h>


#include <vtkSmartPointer.h>
#include <vtkRenderer.h>
#include <vtkRenderWindow.h>
#include <vtkRenderWindowInteractor.h>

//円筒とその表示に必要
#include <vtkCylinderSource.h>
#include <vtkPolyDataMapper.h>

//ライトに必要
#include <vtkLight.h>
#include <vtkLightCollection.h>

#pragma comment(lib,"vtkCommonCore-9.0.lib")
#pragma comment(lib,"vtkRenderingCore-9.0.lib")
#pragma comment(lib,"vtkInteractionStyle-9.0.lib")
#pragma comment(lib,"vtkFiltersSources-9.0.lib")
#pragma comment(lib,"vtkCommonExecutionModel-9.0.lib")

//必須
#pragma comment(lib,"vtkRenderingOpenGL2-9.0.lib")

//必須
VTK_MODULE_INIT(vtkRenderingOpenGL2);
VTK_MODULE_INIT(vtkInteractionStyle);

vtkSmartPointer<vtkActor> create_cylinder_and_map();

vtkSmartPointer<vtkLight> mylight() {

  double lightPosition[3] = { 0, 0, 3 };

  // Create a light
  double lightFocalPoint[3] = { 0,0,0 };
  vtkSmartPointer<vtkLight> light = vtkSmartPointer<vtkLight>::New();
  light->SetLightTypeToSceneLight();
  light->SetPosition(lightPosition[0], lightPosition[1], lightPosition[2]);
  light->SetFocalPoint(lightFocalPoint[0], lightFocalPoint[1], lightFocalPoint[2]);
  light->SetDiffuseColor(1, 0, 0);
  light->SetAmbientColor(0, 1, 0);
  light->SetSpecularColor(0, 0, 1);

  //light->SetConeAngle(10);
  //light->SetPositional(true); // required for vtkLightActor below

  return light;
}

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

  //////////////////////////////////////
  auto renderer = vtkSmartPointer<vtkRenderer>::New();
  renderer->ResetCamera();

  //////////////////////////////////////
  vtkSmartPointer<vtkActor> cylinder_actor = create_cylinder_and_map();
  renderer->AddActor(cylinder_actor);
  //////////////////////////////////////
  vtkSmartPointer<vtkLight> light = mylight();


  //////////////////////////////////////
  auto interactor = vtkSmartPointer<vtkRenderWindowInteractor>::New();

  //////////////////////////////////////
  auto renderWindow = vtkSmartPointer<vtkRenderWindow>::New();

  renderWindow->AddRenderer(renderer);
  renderWindow->SetInteractor(interactor);

  renderWindow->Render();

  // 効果がない（？）
  renderer->LightFollowCameraOff();

  vtkLightCollection* originalLights = renderer->GetLights();
  std::cout << "Originally there are " << originalLights->GetNumberOfItems() << " lights." << std::endl;
  //renderer->RemoveLight((vtkLight*)originalLights->GetItemAsObject(0));
  renderer->RemoveAllLights();// デフォルトのライトを消すために入れている

  // renderWindow->Render() の後にAddLightする
  renderer->AddLight(light);

  interactor->Start(); //イベントループへ入る

  return 0;
}

vtkSmartPointer<vtkActor> create_cylinder_and_map() {
  // Create a vtkCylinderSource
  vtkSmartPointer<vtkCylinderSource> cylinderSource = vtkSmartPointer<vtkCylinderSource>::New();
  cylinderSource->SetCenter(0.0, 0.0, 0.0);
  cylinderSource->SetRadius(5.0);
  cylinderSource->SetHeight(7.0);
  cylinderSource->SetResolution(100);

  // Create a mapper and actor
  vtkSmartPointer<vtkPolyDataMapper> mapper = vtkSmartPointer<vtkPolyDataMapper>::New();
  mapper->SetInputConnection(cylinderSource->GetOutputPort());
  vtkSmartPointer<vtkActor> actor = vtkSmartPointer<vtkActor>::New();
  actor->SetMapper(mapper);

  return actor;

}