文章目录
Qt&Vtk-Cone3
1 代码搬运
1.1 cone3.h
1.2 cone3.cpp
2 运行效果
3 知识点
★ 源码 ★
Qt&Vtk-Cone3
今天接着搬运官方实例代码，还是老朋友Cone。今天要实现的就是下图中的实例。粗略看就是两个Cone吱吱转。这个Demo主要显示了如何在一个窗口中显示多个渲染场景
1 代码搬运
看了下官方实例中的代码，就是新建了两个传染窗口，那么我也这么搞起来。还是在前面的ThirdVtk框架下搞起来。
1.1 cone3.h
#ifndef CONE3_H #define CONE3_H #include <QWidget> #include <QTimer> #include "QVTKOpenGLWidget.h" //新版本，旧版QVTKWidget #include "vtkAutoInit.h" #include "vtkConeSource.h" #include "vtkPolyDataMapper.h" #include "vtkRenderWindow.h" #include "vtkCamera.h" #include "vtkActor.h" #include "vtkRenderer.h" namespace Ui { class Cone3; } class Cone3 : public QWidget { Q_OBJECT public: explicit Cone3(QWidget *parent = 0); ~Cone3(); private: Ui::Cone3 *ui; vtkConeSource *cone = nullptr; //声明椎体 vtkPolyDataMapper *coneMapper = nullptr; //声明映射器 vtkActor *coneActor = nullptr; //声明Actor vtkRenderer *coneRender1 = nullptr,*coneRender2 = nullptr; //声明渲染器 QTimer *rotationTimer = nullptr; //声明定时器，用于旋转椎体 }; #endif // CONE3_H
1.2 cone3.cpp
#include "cone3.h" #include "ui_cone3.h" Cone3::Cone3(QWidget *parent) : QWidget(parent), ui(new Ui::Cone3) { ui->setupUi(this); cone = vtkConeSource::New(); //新建对象 cone->SetHeight(3.0); //设置高度 cone->SetRadius(1.0); //设置半径 cone->SetResolution(20); //翻译为设置分辨率，其实这个是设置椎体的面数的 coneMapper = vtkPolyDataMapper::New(); //新建映射器 coneMapper->SetInputConnection(cone->GetOutputPort()); //设置Cone输出coneMapper数据输入 //新建Actor，并设置映射器 coneActor = vtkActor::New(); coneActor->SetMapper(coneMapper); //新建渲染器并设置Actor和背景颜色 coneRender1 = vtkRenderer::New(); coneRender1->AddActor(coneActor); coneRender1->SetBackground(0.1,0.2,0.3); coneRender1->SetViewport(0.0,0.0,0.5,1.0); coneRender2 = vtkRenderer::New(); coneRender2->AddActor(coneActor); coneRender2->SetBackground(0.7,0.1,0.1); coneRender2->SetViewport(0.5,0.0,1.0,1.0); //获取渲染窗口 ui->widget_Cone1->GetRenderWindow()->AddRenderer(coneRender1); ui->widget_Cone1->GetRenderWindow()->AddRenderer(coneRender2); //旋转椎体 rotationTimer = new QTimer(); connect(rotationTimer,&QTimer::timeout,this,[=](){ coneRender1->GetActiveCamera()->Azimuth(1); coneRender2->GetActiveCamera()->Azimuth(2); ui->widget_Cone1->GetRenderWindow()->Render();//注意这句话，要加上呀，不然人不给你转，惰性渲染。 }); rotationTimer->start(25); } Cone3::~Cone3() { rotationTimer->stop(); delete ui; }
3 知识点
这个其实就是靠着两个渲染器来搞定的，两个通过不同的VIewPort（）来实现的，关键代码如下
coneRender1 = vtkRenderer::New(); coneRender1->AddActor(coneActor); coneRender1->SetBackground(0.1,0.2,0.3); coneRender1->SetViewport(0.0,0.0,0.5,1.0); coneRender2 = vtkRenderer::New(); coneRender2->AddActor(coneActor); coneRender2->SetBackground(0.7,0.1,0.1); coneRender2->SetViewport(0.5,0.0,1.0,1.0);
