vtk实现三维数据的点拾取

#include <vtkSmartPointer.h>
#include <vtkRendererCollection.h>
#include <vtkPointPicker.h>
#include <vtkSphereSource.h>
#include <vtkPolyDataMapper.h>
#include <vtkRenderer.h>
#include <vtkRenderWindow.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkActor.h>
#include <vtkInteractorStyleTrackballCamera.h>
#include <vtkObjectFactory.h>
#include <vtkProperty.h>
#include <vtkSTLReader.h>
#include <vtkAutoInit.h> 
VTK_MODULE_INIT(vtkRenderingOpenGL2);
VTK_MODULE_INIT(vtkInteractionStyle);
VTK_MODULE_INIT(vtkRenderingFreeType)


// PointPickerInteractorStyle
class PointPickerInteractorStyle : public vtkInteractorStyleTrackballCamera
{
public:
	static PointPickerInteractorStyle* New();
	vtkTypeMacro(PointPickerInteractorStyle, vtkInteractorStyleTrackballCamera);

	virtual void OnLeftButtonDown()
	{
		std::cout << "Picking pixel: " << this->Interactor->GetEventPosition()[0] << " " << this->Interactor->GetEventPosition()[1] << std::endl;
		this->Interactor->GetPicker()->Pick(this->Interactor->GetEventPosition()[0],
			this->Interactor->GetEventPosition()[1],
			0,  // always zero.
			this->Interactor->GetRenderWindow()->GetRenderers()->GetFirstRenderer());
		double picked[3];
		this->Interactor->GetPicker()->GetPickPosition(picked);
		std::cout << "Picked value: " << picked[0] << " " << picked[1] << " " << picked[2] << std::endl;

		vtkSmartPointer<vtkSphereSource> sphereSource =
			vtkSmartPointer<vtkSphereSource>::New();
		sphereSource->Update();

		vtkSmartPointer<vtkPolyDataMapper> mapper =
			vtkSmartPointer<vtkPolyDataMapper>::New();
		mapper->SetInputConnection(sphereSource->GetOutputPort());
		vtkSmartPointer<vtkActor> actor = vtkSmartPointer<vtkActor>::New();
		actor->SetMapper(mapper);
		actor->SetPosition(picked);
		actor->SetScale(0.8);//设置显示点的大小
		actor->GetProperty()->SetColor(1.0, 0.0, 0.0);
		this->Interactor->GetRenderWindow()->GetRenderers()->GetFirstRenderer()->AddActor(actor);

		vtkInteractorStyleTrackballCamera::OnLeftButtonDown();
	}
};

vtkStandardNewMacro(PointPickerInteractorStyle);

int main(int, char *[])
{
	// Read a stl file.
	vtkSmartPointer<vtkPolyData> input1 = vtkSmartPointer<vtkPolyData>::New();
	vtkSmartPointer<vtkSTLReader> reader1 = vtkSmartPointer<vtkSTLReader>::New();
	reader1->SetFileName("test.stl");
	reader1->Update();
	input1->DeepCopy(reader1->GetOutput());

	// Create a mapper and actor
	vtkSmartPointer<vtkPolyDataMapper> mapper =
		vtkSmartPointer<vtkPolyDataMapper>::New();
	mapper->SetInputConnection(reader1->GetOutputPort());
	vtkSmartPointer<vtkActor> actor =
		vtkSmartPointer<vtkActor>::New();
	actor->SetMapper(mapper);

	// Create a renderer, render window, and interactor
	vtkSmartPointer<vtkRenderer> renderer =
		vtkSmartPointer<vtkRenderer>::New();
	vtkSmartPointer<vtkRenderWindow> renderWindow =
		vtkSmartPointer<vtkRenderWindow>::New();
	renderWindow->Render();
	renderWindow->SetWindowName("PointPicker");
	renderWindow->AddRenderer(renderer);

	vtkSmartPointer<vtkPointPicker> pointPicker =
		vtkSmartPointer<vtkPointPicker>::New();

	vtkSmartPointer<vtkRenderWindowInteractor> renderWindowInteractor =
		vtkSmartPointer<vtkRenderWindowInteractor>::New();
	renderWindowInteractor->SetPicker(pointPicker);
	renderWindowInteractor->SetRenderWindow(renderWindow);

	vtkSmartPointer<PointPickerInteractorStyle> style =
		vtkSmartPointer<PointPickerInteractorStyle>::New();
	renderWindowInteractor->SetInteractorStyle(style);

	// Add the actor to the scene
	renderer->AddActor(actor);
	renderer->SetBackground(1, 1, 1);

	// Render and interact
	renderWindow->Render();
	renderWindowInteractor->Start();

	return EXIT_SUCCESS;
}