前言

这篇博客针对<<VS+QT+VTK三维曲面网格点选切割>>编写代码，代码整洁，规则，易读。学习与应用推荐首选。

功能：读取三维网格数据，通过单击网格表面点选需要切除的部分。

文章目录

一、所需工具软件

二、使用步骤

1. 引入库

2. 代码实现

3. 运行结果

三、在线协助

一、所需工具软件

1. VS, Qt

2. VTK

二、使用步骤

1.引入库

#include <iostream>
#include <fstream>
#include <vtkSelectPolyData.h>
#include <vtkSmartPointer.h>
#include <vtkPolyDataMapper.h>
#include <vtkDataSetMapper.h>
#include <vtkActor.h>
#include <vtkRenderWindow.h>
#include <vtkRenderer.h>
#include <vtkRendererCollection.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkIdTypeArray.h>
#include <vtkPolyData.h>
#include <vtkCellArray.h>
#include <vtkSphereSource.h>
#include <vtkCellPicker.h>
#include <vtkInteractorStyleTrackballCamera.h>
#include <vtkProperty.h>
#include <vtkSelectionNode.h>
#include <vtkSelection.h>
#include <vtkExtractSelection.h>
#include <vtkObjectFactory.h>
#include <vtkPointData.h>
#include <iostream>
#include <vector>

2. 代码实现

代码如下:

class CellPickerInteractorStyle : public vtkInteractorStyleTrackballCamera
{
public:
	static CellPickerInteractorStyle* New();

	CellPickerInteractorStyle()
	{
		selectedMapper = vtkSmartPointer<vtkDataSetMapper>::New();
		selectedActor = vtkSmartPointer<vtkActor>::New();
		polyData = vtkPolyData::New();

		//xvec.resize(5);
		//yvec.resize(5);
		//zvec.resize(5);
		last_picked_actor = NULL;
	}

	virtual void OnLeftButtonDown()
	{
		//打印鼠标左键像素位置
		if (this->Interactor->GetControlKey())
		{
			std::cout << "Picking pixel: " << this->Interactor->GetEventPosition()[0]
				<< " " << this->Interactor->GetEventPosition()[1] << std::endl;
			//注册拾取点函数
			this->Interactor->GetPicker()->Pick(
				this->Interactor->GetEventPosition()[0],
				this->Interactor->GetEventPosition()[1], 0,  // always zero.
				this->Interactor->GetRenderWindow()->GetRenderers()->GetFirstRenderer()
			);
			//打印拾取点空间位置
			this->Interactor->GetPicker()->GetPickPosition(picked);
			cout << "Picked value: " << picked[0] << " " << picked[1] << " " << picked[2] << endl;

			//获取此次的标记点。
			this->last_picked_actor = GetActor();
			markPoint.push_back(last_picked_actor);
			if (this->last_picked_actor)
			{
				//标记出来
				this->last_picked_actor->SetScale(0.02);
				this->last_picked_actor->GetProperty()->SetColor(1.0, 0.0, 0.0);
				this->Interactor->GetRenderWindow()->GetRenderers()->GetFirstRenderer()->AddActor(this->last_picked_actor);
			}

		}
		vtkInteractorStyleTrackballCamera::OnLeftButtonDown();
	}


};

int main(int, char* [])
{

	// Read a stl file.
	reader1->SetFileName("bunny.stl");
	reader1->Update();
	TheStlPoly->DeepCopy(reader1->GetOutput());

	// Create a mapper and actor
	vtkSmartPointer<vtkPolyDataMapper> mapper =
		vtkSmartPointer<vtkPolyDataMapper>::New();
	mapper->SetInputData(TheStlPoly);

	actor->SetMapper(mapper);
	actor->GetProperty()->SetOpacity(1);

	// 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);
	vtkNew<vtkNamedColors> colors;
	renderer->SetBackground(colors->GetColor3d("CadetBlue").GetData());
	vtkSmartPointer<CellPickerInteractorStyle> pointPicker = vtkSmartPointer<CellPickerInteractorStyle>::New();
	vtkSmartPointer<vtkRenderWindowInteractor> renderWindowInteractor = vtkSmartPointer<vtkRenderWindowInteractor>::New();
	renderWindowInteractor->SetInteractorStyle(pointPicker);
	renderWindowInteractor->SetRenderWindow(renderWindow);


	// Add the actor to the scene
	renderer->AddActor(actor);
	//renderer->SetBackground(0, 0, 0);

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

	return EXIT_SUCCESS;
}