1、建模平台效果

2、三维控件OCCWidget

  将V3d_View视图与控件句柄绑定即可实现3d视图嵌入Qt中，为了方便也可以基于QOpenGLWidget控件进行封装，方便嵌入各种窗体使用并自由缩放。

#ifndef OCCTWIDGET_H
#define OCCTWIDGET_H#include <QWidget>
#include <QMouseEvent>
#include <QWheelEvent>
#include <QKeyEvent>
#include <QApplication>
#include <AIS_InteractiveContext.hxx>
#include <OpenGl_GraphicDriver.hxx>
#include <V3d_View.hxx>
#include <Aspect_Handle.hxx>
#include <Aspect_DisplayConnection.hxx>
#include <Graphic3d_GraphicDriver.hxx>
#include <QOpenGLWidget>
#include <WNT_Window.hxx>//三维显示窗口class OCCTWidget : public QOpenGLWidget
{Q_OBJECTpublic:explicit OCCTWidget(QWidget *parent = nullptr);//  获取三维环境交互对象Handle(AIS_InteractiveContext) getInteractiveContext(){return m_InteractiveContext;}//  获取三维显示界面Handle(V3d_View)  get3dView(){return m_3dView;}private:// 初始化交互环境void initializeInteractiveContext();// 交互式上下文能够管理一个或多个查看器(viewer)中的图形行为和交互式对象的选择Handle(AIS_InteractiveContext) m_InteractiveContext;// 定义查看器(viewer)类型对象上的服务Handle(V3d_Viewer) m_3dViewer;// 创建一个视图Handle(V3d_View) m_3dView;// 创建3d接口定义图形驱动程序Handle(Graphic3d_GraphicDriver) m_graphicDriver;protected:// 覆写绘图事件void paintEvent(QPaintEvent *);// 覆写窗口尺寸变化事件void resizeEvent(QResizeEvent *);// 覆写鼠标按键按下事件void mousePressEvent(QMouseEvent *event);// 覆写鼠标按键释放事件void mouseReleaseEvent(QMouseEvent *event);// 覆写鼠标移动事件void mouseMoveEvent(QMouseEvent *event);// 覆写鼠标滚轮事件void wheelEvent(QWheelEvent *event);
private:Standard_Integer m_xValue;    // 记录鼠标平移坐标XStandard_Integer m_yValue;    // 记录鼠标平移坐标YCurrentAction3d m_currentMode; // 三维场景转换模式
};#endif // OCCTWIDGET_H

void OCCTWidget::initializeInteractiveContext()
{//若交互式上下文为空，则创建对象if (m_InteractiveContext.IsNull()){//此对象提供与X server的连接，在Windows和Mac OS中不起作用Handle(Aspect_DisplayConnection) m_display_donnection = new Aspect_DisplayConnection();//创建OpenGl图形驱动if (m_graphicDriver.IsNull()){m_graphicDriver = new OpenGl_GraphicDriver(m_display_donnection);}//获取QWidget的窗口系统标识符WId window_handle = (WId) winId();// 创建Windows NT 窗口Handle(WNT_Window) wind = new WNT_Window((Aspect_Handle) window_handle);//创建3D查看器m_3dViewer = new V3d_Viewer(m_graphicDriver);//创建视图m_3dView = m_3dViewer->CreateView();m_3dView->SetWindow(wind);//打开窗口if (!wind->IsMapped()){wind->Map();}//创建交互式上下文m_InteractiveContext = new AIS_InteractiveContext(m_3dViewer);  …………………………………………………………………………}
}

3、三维建模类OCCModeling

  对OCC提供的各种建模函数进行验证，并实现较为复杂的水瓶建模。

#include <BRepPrimAPI_MakeSphere.hxx>
#include <BRepPrimAPI_MakeCone.hxx>
#include <BRepPrimAPI_MakeTorus.hxx>
#include <BRepPrimAPI_MakeBox.hxx>
#include <BRepOffsetAPI_MakePipe.hxx>  
#include <AIS_Shape.hxx>#include <Geom_TrimmedCurve.hxx>
#include <GC_MakeArcOfCircle.hxx>
#include <GC_MakeSegment.hxx>
#include <BRepBuilderAPI_MakeEdge.hxx>
#include <TopoDS_Wire.hxx>
#include <BRepBuilderAPI_MakeWire.hxx>
#include <BRepBuilderAPI_Transform.hxx>
#include <BRepBuilderAPI_MakeFace.hxx>
#include <BRepBuilderAPI_MakeEdge.hxx>
#include <TopoDS.hxx>
#include <BRepPrimAPI_MakePrism.hxx>
#include <BRepFilletAPI_MakeFillet.hxx>
#include <TopExp_Explorer.hxx>
#include <BRepPrimAPI_MakeCylinder.hxx>
#include <BRepAlgoAPI_Fuse.hxx>
#include <Geom_Plane.hxx>
#include <TopoDS_Edge.hxx>
#include <BRepOffsetAPI_MakeThickSolid.hxx>
#include <Geom_CylindricalSurface.hxx>
#include <Geom2d_Ellipse.hxx>
#include <Geom2d_TrimmedCurve.hxx>
#include <GCE2d_MakeSegment.hxx>
#include <BRepLib.hxx>
#include <BRepOffsetAPI_ThruSections.hxx>
#include <Geom_BezierCurve.hxx>class OCCTModeling
{
public://  生成立方体static TopoDS_Shape CreateBoxModel(Standard_Real _dx = 1.0, Standard_Real _dy = 1.0, Standard_Real _dz = 1.0);//  生成圆柱static TopoDS_Shape CreateCylinder(Standard_Real _R = 0.5, Standard_Real _H = 2.0);//  球体static TopoDS_Shape CreateSphere(Standard_Real _R = 1.0);//  生成圆锥static TopoDS_Shape CreateCone(Standard_Real _R1 = 1.0, Standard_Real _R2 = 0.0, Standard_Real _H = 2.0);//  生成圆环体static TopoDS_Shape CreateTorus(Standard_Real _R1 = 2.0, Standard_Real _R2 = 0.5);//  生成水瓶 static TopoDS_Shape CreateBottle(Standard_Real _Width = 60.0, Standard_Real _Height = 40.0, Standard_Real _Thickness = 20.0);//  生成直管static TopoDS_Shape CreatePipe(const Standard_Real dRadius = 20.0, const Standard_Real dThickness = 2.0, const Standard_Real dLength = 100.0);
};

4、源码地址