我一直都想把vtk显示这一块做成一个封装的静态lib，然后别的类只需要我暴露出的头文件和lib文件就可以了，这次我实现的是对一个放stl文件的文件夹下的stl文件做显示，用的是vs2017+qt,实现的主要效果如下：

因为qt自身带的标题栏显示有点单调，我们这里使用了自定义标题栏。
stl模型主要是这样被显示的：

封装的代码：

#pragma once

#include <vtkAutoInit.h>
#include <vtkPolyDataMapper.h>
#include <vtkProperty.h>
#include <vtkRenderWindow.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkRenderer.h>
#include <vtkSTLReader.h>
#include <vtkSmartPointer.h>
#include <QVTKWidget.h>
#include <QtWidgets/QWidget>
#include <QtWidgets/qpushbutton.h>
#include <QtWidgets/qlayout.h>
#include <QtWidgets/qlabel.h>
#include <QtGui/qevent.h>
VTK_MODULE_INIT(vtkRenderingOpenGL2);
VTK_MODULE_INIT(vtkInteractionStyle);


#pragma once


class STLVTK : public QWidget
{
    Q_OBJECT

public:
    STLVTK(QWidget *parent = nullptr);
    ~STLVTK();
	void OpenSTLFiles(QString stlfolder);
	void STLShow();
private:
	void initWidget();
	QVTKWidget* m_vtkWidget = nullptr;
	QPoint m_dragPosition;
	QPushButton *m_closeButton = nullptr;
	QLabel *m_mainContent = nullptr;
protected:
	void mousePressEvent(QMouseEvent *event) override;
	void mouseMoveEvent(QMouseEvent *event) override;
};

对外只有两个函数，一个是显示一个是指定文件夹下模型路径

#include "STLVTK.h"
#include <QtWidgets/qfiledialog.h>
#include <vtkCornerAnnotation.h>
#include <vtkTextProperty.h>
#include <vtkTextActor.h>

STLVTK::STLVTK(QWidget *parent)
    : QWidget(parent)
{
	initWidget();
}

STLVTK::~STLVTK()
{}

void STLVTK::OpenSTLFiles(QString stlfolder){
	QDir dir(stlfolder);
	QStringList stlFiles = dir.entryList(QStringList() << "*.stl", QDir::Files);
	for (int i = 0; i < stlFiles.size(); ++i) {
		vtkSmartPointer<vtkSTLReader> reader = vtkSmartPointer<vtkSTLReader>::New();
		reader->SetFileName(dir.filePath(stlFiles[i]).toStdString().c_str());
		reader->Update();

		vtkSmartPointer<vtkPolyDataMapper> mapper = vtkSmartPointer<vtkPolyDataMapper>::New();
		mapper->SetInputConnection(reader->GetOutputPort());

		vtkSmartPointer<vtkActor> actor = vtkSmartPointer<vtkActor>::New();
		actor->SetMapper(mapper);

		vtkSmartPointer<vtkRenderer> renderer = vtkSmartPointer<vtkRenderer>::New();
		renderer->AddActor(actor);

		
		// 计算合适的位置布局
		int numRows = std::ceil(std::sqrt(stlFiles.size()));
		int numCols = std::ceil((float)stlFiles.size() / numRows);

		double width = 1.0 / numCols;
		double height = 1.0 / numRows;

		double xIndex = i % numCols;
		double yIndex = i / numCols;

		renderer->SetViewport(xIndex * width, (numRows - yIndex - 1) * height, (xIndex + 1) * width, (numRows - yIndex) * height);

		m_vtkWidget->GetRenderWindow()->AddRenderer(renderer);
	}
#if 0
	vtkSmartPointer<vtkSTLReader> reader = vtkSmartPointer<vtkSTLReader>::New();
	reader->SetFileName(stlfolder.toStdString().c_str());
	reader->Update();

	//将source转换成mapper
	vtkSmartPointer<vtkPolyDataMapper> mapper = vtkSmartPointer<vtkPolyDataMapper>::New();
	mapper->SetInputConnection(reader->GetOutputPort());

	//送入渲染引擎进行显示
	vtkSmartPointer<vtkActor> actor = vtkSmartPointer<vtkActor>::New();
	actor->SetMapper(mapper);

	//渲染
	vtkSmartPointer<vtkRenderer> renderer = vtkSmartPointer<vtkRenderer>::New();
	renderer->AddActor(actor);
	renderer->SetBackground(.0, .0, .0);

	//设置渲染窗口
	vtkSmartPointer<vtkRenderWindow> window = vtkSmartPointer<vtkRenderWindow>::New();
	m_vtkWidget->SetRenderWindow(window);
	m_vtkWidget->GetRenderWindow()->AddRenderer(renderer);
#endif
}

void STLVTK::STLShow()
{
	this->show();
}

void STLVTK::initWidget()
{
	setWindowFlags(Qt::FramelessWindowHint);
	QHBoxLayout* hlayout1 = new QHBoxLayout;
	QHBoxLayout* hlayout2 = new QHBoxLayout;
	m_mainContent = new QLabel;
	m_mainContent->setStyleSheet("background-color: rgb(0, 0, 139);");
	m_mainContent->setFixedHeight(50);

	m_closeButton = new QPushButton;
	m_closeButton->setObjectName("CloseButton");
	m_closeButton->setStyleSheet("QPushButton {"
		"background-image:url(:/sysButton/sysbutton/close.png);"
		"background-repeat: no-repeat;"
		"background-position: center;"
		"}");
	QLabel* label = new QLabel(QString::fromLocal8Bit("预览打印"));
	label->setStyleSheet("color: #FDF5E6;");
	hlayout1->addWidget(label);
	hlayout1->addStretch();
	hlayout1->addWidget(m_closeButton);

	m_mainContent->setLayout(hlayout1);
	m_mainContent->setMargin(0);
	connect(m_closeButton, &QPushButton::clicked, this, &QWidget::hide);

	QWidget *widget = new QWidget();
	widget->setObjectName("modelwidget");
	widget->setStyleSheet("#modelwidget {"
		"background-image:url(:/BackGround/background/center_bg.png);"
		"}");

	m_vtkWidget = new QVTKWidget;
	m_vtkWidget->setFixedSize(1300, 800);

	hlayout2->addWidget(m_vtkWidget);
	widget->setLayout(hlayout2);

	QVBoxLayout *mainLayout = new QVBoxLayout();
	mainLayout->setMargin(3);
	mainLayout->addWidget(m_mainContent);
	mainLayout->addWidget(widget);


	setLayout(mainLayout);
	this->setStyleSheet("background-color: rgb(250, 255, 250)");
}

void STLVTK::mousePressEvent(QMouseEvent * event){
	if (event->button() == Qt::LeftButton)
	{
		m_dragPosition = event->globalPos() - frameGeometry().topLeft();
		event->accept();
	}
}

void STLVTK::mouseMoveEvent(QMouseEvent * event)
{
	if (event->buttons() == Qt::LeftButton)
	{
		move(event->globalPos() - m_dragPosition);
		event->accept();
	}
}