VTK系列56_VTK对几何体网格抽取（多分辨率处理）

实例56：网格抽取（多分辨率处理）

#include <vtkAutoInit.h>
VTK_MODULE_INIT(vtkRenderingOpenGL2);
VTK_MODULE_INIT(vtkRenderingFreeType);
VTK_MODULE_INIT(vtkInteractionStyle);

#include <vtkPolyData.h>
#include <vtkSphereSource.h>
#include <vtkDecimatePro.h>
#include <vtkQuadricDecimation.h>
#include <vtkQuadricClustering.h>
#include <vtkSmartPointer.h>
#include <vtkPolyDataMapper.h>
#include <vtkProperty.h>
#include <vtkRenderWindow.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkRenderer.h>
#include <vtkPolydataReader.h>
#include <vtkCamera.h>

//测试文件：../data/fran_cut.vtk
int main(int argc, char * argv[])
{
	vtkSmartPointer<vtkPolyDataReader> reader = 
		vtkSmartPointer<vtkPolyDataReader>::New();
	reader->SetFileName("C:\\Users\\Administrator\\Desktop\\VTK2\\hellovtk\\vtk_图像处理学习\\第六章_图像处理\\data\\fran_cut.vtk");
	reader->Update();
	vtkSmartPointer<vtkPolyData> original  =  reader->GetOutput();

	std::cout << "抽取前：" << std::endl << "------------" << std::endl;
	std::cout << "模型点数为： " << original->GetNumberOfPoints() << std::endl;
	std::cout << "模型面数为： " << original->GetNumberOfPolys() << std::endl;

	vtkSmartPointer<vtkDecimatePro> decimate =
		vtkSmartPointer<vtkDecimatePro>::New();
	decimate->SetInputData(original);
	decimate->SetTargetReduction(.80); //80%的三角面片被移除
	decimate->Update();

	vtkSmartPointer<vtkPolyData> decimated = decimate->GetOutput();
	std::cout << "抽取后" << std::endl << "------------" << std::endl;
	std::cout << "模型点数为：" << decimated->GetNumberOfPoints()<< std::endl;
	std::cout << "模型面数为：" << decimated->GetNumberOfPolys()<< std::endl;

	vtkSmartPointer<vtkPolyDataMapper> origianlMapper =
		vtkSmartPointer<vtkPolyDataMapper>::New();
	origianlMapper->SetInputData(original);

	vtkSmartPointer<vtkActor> origianlActor =
		vtkSmartPointer<vtkActor>::New();
	origianlActor->SetMapper(origianlMapper);

	vtkSmartPointer<vtkPolyDataMapper> decimatedMapper =
		vtkSmartPointer<vtkPolyDataMapper>::New();
	decimatedMapper->SetInputData(decimated);

	vtkSmartPointer<vtkActor> decimatedActor =
		vtkSmartPointer<vtkActor>::New();
	decimatedActor->SetMapper(decimatedMapper);

	double leftViewport[4] = {0.0, 0.0, 0.5, 1.0};
	double rightViewport[4] = {0.5, 0.0, 1.0, 1.0};

	vtkSmartPointer<vtkRenderer> leftRenderer =
		vtkSmartPointer<vtkRenderer>::New();
	leftRenderer->SetViewport(leftViewport);
	leftRenderer->AddActor(origianlActor);
	leftRenderer->SetBackground(1.0, 1.0, 1.0);

	vtkSmartPointer<vtkRenderer> rightRenderer =
		vtkSmartPointer<vtkRenderer>::New();
	rightRenderer->SetViewport(rightViewport);
	rightRenderer->AddActor(decimatedActor);
	rightRenderer->SetBackground(1.0, 1.0, 1.0);

	leftRenderer->GetActiveCamera()->SetPosition(0, -1, 0);
	leftRenderer->GetActiveCamera()->SetFocalPoint(0, 0, 0);
	leftRenderer->GetActiveCamera()->SetViewUp(0, 0, 1);
	leftRenderer->GetActiveCamera()->Azimuth(30);
	leftRenderer->GetActiveCamera()->Elevation(30);
	leftRenderer->ResetCamera();
	rightRenderer->SetActiveCamera(leftRenderer->GetActiveCamera());

	vtkSmartPointer<vtkRenderWindow> renderWindow =
		vtkSmartPointer<vtkRenderWindow>::New();
	renderWindow->AddRenderer(leftRenderer);
	renderWindow->AddRenderer(rightRenderer);
	renderWindow->SetSize(640, 320);
	renderWindow->Render();
	renderWindow->SetWindowName("PolyDataDecimation");

	vtkSmartPointer<vtkRenderWindowInteractor> interactor =
		vtkSmartPointer<vtkRenderWindowInteractor>::New();
	interactor->SetRenderWindow(renderWindow);

	renderWindow->Render();
	interactor->Start();

	return EXIT_SUCCESS;
}

 

VTK系列目录：

1 VTK基本概念

2 VTK图像处理

3 VTK图形处理

4 VTK体绘制