VTK系列55_VTK对几何体连通区域分析

实例55：连通区域分析

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

#include <vtkSmartPointer.h>
#include <vtkSphereSource.h>
#include <vtkConeSource.h>
#include <vtkPolyDataConnectivityFilter.h>
#include <vtkPolyDataMapper.h>
#include <vtkActor.h>
#include <vtkProperty.h>
#include <vtkRenderer.h>
#include <vtkRenderWindow.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkAppendPolyData.h>

int main(int, char *[])
{
	vtkSmartPointer<vtkSphereSource> sphereSource = 
		vtkSmartPointer<vtkSphereSource>::New();
	sphereSource->SetRadius(10);
	sphereSource->SetThetaResolution(10);
	sphereSource->SetPhiResolution(10);
	sphereSource->Update();

	vtkSmartPointer<vtkConeSource> coneSource = 
		vtkSmartPointer<vtkConeSource>::New();
	coneSource->SetRadius(5);
	coneSource->SetHeight(10);
	coneSource->SetCenter(25,0,0);
	coneSource->Update();

	vtkSmartPointer<vtkAppendPolyData> appendFilter = 
		vtkSmartPointer<vtkAppendPolyData>::New();
	appendFilter->AddInputData(sphereSource->GetOutput());
	appendFilter->AddInputData(coneSource->GetOutput());
	appendFilter->Update();

	vtkSmartPointer<vtkPolyDataConnectivityFilter> connectivityFilter = 
		vtkSmartPointer<vtkPolyDataConnectivityFilter>::New();
	connectivityFilter->SetInputData(appendFilter->GetOutput());
	connectivityFilter->SetExtractionModeToCellSeededRegions();
	connectivityFilter->AddSeed(100);
	connectivityFilter->Update();

	vtkSmartPointer<vtkPolyDataMapper> originalMapper = 
		vtkSmartPointer<vtkPolyDataMapper>::New();
	originalMapper->SetInputConnection(appendFilter->GetOutputPort());
	originalMapper->Update();

	vtkSmartPointer<vtkActor> originalActor = 
		vtkSmartPointer<vtkActor>::New();
	originalActor->SetMapper(originalMapper);

	vtkSmartPointer<vtkPolyDataMapper> extractedMapper = 
		vtkSmartPointer<vtkPolyDataMapper>::New();
	extractedMapper->SetInputConnection(connectivityFilter->GetOutputPort());
	extractedMapper->Update();

	vtkSmartPointer<vtkActor> extractedActor = 
		vtkSmartPointer<vtkActor>::New();
	extractedActor->SetMapper(extractedMapper);

	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(originalActor);
	leftRenderer->SetBackground(0.8, 0.8, 0.8);

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

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

	leftRenderer->ResetCamera();
	rightRenderer->SetActiveCamera(leftRenderer->GetActiveCamera());

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

	return EXIT_SUCCESS;
}

 

SetExtractionModeToLargestRegion()：用于提取具有最多点数的连通区域；
SetExtractionModeToAllRegions()：该模式主要用于连通区域标记，配合函数ColorRegionsOn()使用，在连通区域像是的同时，生成一个名为RegionId的点属性数据。
SetExtractionModeToSpecifiedRegions()：该模式用于提取一个或多个连通区域，在该模式下，需要通过AddSpecifiedRegion()来添加西药提取的区域号，区域号从零开始。
SetExtractionModeToClosestPointRegion()：该模式需要使用SetClosestPoint()函数设置一个空间点坐标，执行结果为离该点最近的连通区域。
SetExtractionModeToPointSeededRegions()：该模式下需要使用AddSeed()函数添加种子点，提取种子点所在的区域。
SetExtractionModeToCellSeededRegions()：该模式下需要使用AddSeed()函数调价种子单元，提取种子单元所在的区域。

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