Featured program examples

VS+QT+VTK three-dimensional surface mesh point selection cutting

If you need to install the operating environment or remote debugging, see the personal QQ business card at the bottom of the article, and professional and technical personnel will assist remotely!

foreword

This blog writes code for <<VS+QT+VTK 3D surface mesh point selection>>, the code is neat, regular and easy to read. The first choice for learning and application recommendation.

Function: Read 3D grid data, and select the part to be cut by clicking on the grid surface .

Article directory

1. Required tool software

2. Use steps

1. Import library

2. Code implementation

3. Running results

3. Online assistance

1. Required tool software

1. VS, Qt

2. VTK

2. Use steps

1. Import library

#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. Code implementation

code show as below:

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;
}

3. Running results

3. Online assistance:

If you need to install the operating environment or remote debugging, see the personal QQ business card at the bottom of the article, and professional and technical personnel will assist remotely!
1) Remote installation and operation environment, code debugging
2) Qt, C++, Python entry guide
3) Interface beautification
4) Software production