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osgQt创建场景数据并显示

news 来源：原创 2025/6/17 3:05:28

一、流程

使用 ‌osgQt‌ 创建并显示场景的核心流程：
1、配置Qt项目配置‌（*.pro文件）

QT += core gui opengl widgets
LIBS += -losg -losgQt -losgViewer -losgGA -losgDB

2、创建场景数据。

osg::Node* createCube() {
    osg::ref_ptr<osg::Geode> geode = new osg::Geode;
    osg::ref_ptr<osg::Geometry> geometry = new osg::Geometry;

    // 定义8个顶点（立方体）
    osg::Vec3Array* vertices = new osg::Vec3Array;
    vertices->push_back(osg::Vec3(-1.0f, -1.0f,  1.0f)); // 前左下
    vertices->push_back(osg::Vec3( 1.0f, -1.0f,  1.0f)); // 前右下
    vertices->push_back(osg::Vec3( 1.0f,  1.0f,  1.0f)); // 前右上
    vertices->push_back(osg::Vec3(-1.0f,  1.0f,  1.0f)); // 前左上
    vertices->push_back(osg::Vec3(-1.0f, -1.0f, -1.0f)); // 后左下
    vertices->push_back(osg::Vec3( 1.0f, -1.0f, -1.0f)); // 后右下
    vertices->push_back(osg::Vec3( 1.0f,  1.0f, -1.0f)); // 后右上
    vertices->push_back(osg::Vec3(-1.0f,  1.0f, -1.0f)); // 后左上
    geometry->setVertexArray(vertices);

    // 定义法线
    osg::Vec3Array* normals = new osg::Vec3Array;
    normals->push_back(osg::Vec3( 0.0f,  0.0f,  1.0f)); // 前
    normals->push_back(osg::Vec3( 0.0f,  0.0f, -1.0f)); // 后
    normals->push_back(osg::Vec3( 1.0f,  0.0f,  0.0f)); // 右
    normals->push_back(osg::Vec3(-1.0f,  0.0f,  0.0f)); // 左
    normals->push_back(osg::Vec3( 0.0f,  1.0f,  0.0f)); // 上
    normals->push_back(osg::Vec3( 0.0f, -1.0f,  0.0f)); // 下
    geometry->setNormalArray(normals, osg::Array::BIND_PER_PRIMITIVE_SET);

    // 定义6个面（12个三角形）
    osg::DrawElementsUInt* faces = new osg::DrawElementsUInt(osg::PrimitiveSet::TRIANGLES, 0);

    // 前面
    faces->push_back(0); faces->push_back(1); faces->push_back(2);
    faces->push_back(2); faces->push_back(3); faces->push_back(0);

    // 后面
    faces->push_back(5); faces->push_back(4); faces->push_back(7);
    faces->push_back(7); faces->push_back(6); faces->push_back(5);

    // 右面
    faces->push_back(1); faces->push_back(5); faces->push_back(6);
    faces->push_back(6); faces->push_back(2); faces->push_back(1);

    // 左面
    faces->push_back(4); faces->push_back(0); faces->push_back(3);
    faces->push_back(3); faces->push_back(7); faces->push_back(4);

    // 上面
    faces->push_back(3); faces->push_back(2); faces->push_back(6);
    faces->push_back(6); faces->push_back(7); faces->push_back(3);

    // 下面
    faces->push_back(4); faces->push_back(5); faces->push_back(1);
    faces->push_back(1); faces->push_back(0); faces->push_back(4);

    geometry->addPrimitiveSet(faces);
    geode->addDrawable(geometry);

    return geode.release();
}

3、初始化Viewer与QT窗口绑定。

osgWidget = findChild<osgQOpenGLWidget*>("openGLWidget");

    osgViewer::Viewer *viewer = osgWidget->getOsgViewer();
    viewer->setSceneData(createCube());
    viewer->setCameraManipulator(new osgGA::TrackballManipulator);
    viewer->getCamera()->setViewport(0, 0, osgWidget->width(), osgWidget->height());
    viewer->getCamera()->setClearColor(osg::Vec4(0.1, 0.1, 0.3, 1.0));  // 深蓝色背景

    // 设置摄像机视角
    viewer->getCamera()->setViewMatrixAsLookAt(
           osg::Vec3d(0,5,5),  // 视点
           osg::Vec3d(0,0,0),  // 中心点
           osg::Vec3d(0,0,1)   // 上方向
    );

二、代码示例

mainwindow.h

#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>
#include <osgQOpenGL/osgQOpenGLWidget>
#include <osg/ref_ptr>
#include <osgGA/TrackballManipulator>

QT_BEGIN_NAMESPACE
namespace Ui { class MainWindow; }
QT_END_NAMESPACE

class MainWindow : public QMainWindow
{
    Q_OBJECT

public:
    MainWindow(QWidget *parent = nullptr);
    ~MainWindow();

private slots:
    void on_pushButton_clicked();

private:
    Ui::MainWindow *ui;

private:
    osgQOpenGLWidget *osgWidget;

    // QWidget interface
protected:
    void showEvent(QShowEvent *event);
};
#endif // MAINWINDOW_H

mainwindow.cpp

#include "mainwindow.h"
#include "ui_mainwindow.h"
#include <osgDB/ReadFile>
#include <osg/PositionAttitudeTransform>
#include <osg/Node>
#include <osgViewer/Viewer>
#include <QDebug>

#include <osg/Geode>
#include <osg/Geometry>
#include <osgDB/WriteFile>

osg::Node* createCube() {
    osg::ref_ptr<osg::Geode> geode = new osg::Geode;
    osg::ref_ptr<osg::Geometry> geometry = new osg::Geometry;

    // 定义8个顶点（立方体）
    osg::Vec3Array* vertices = new osg::Vec3Array;
    vertices->push_back(osg::Vec3(-1.0f, -1.0f,  1.0f)); // 前左下
    vertices->push_back(osg::Vec3( 1.0f, -1.0f,  1.0f)); // 前右下
    vertices->push_back(osg::Vec3( 1.0f,  1.0f,  1.0f)); // 前右上
    vertices->push_back(osg::Vec3(-1.0f,  1.0f,  1.0f)); // 前左上
    vertices->push_back(osg::Vec3(-1.0f, -1.0f, -1.0f)); // 后左下
    vertices->push_back(osg::Vec3( 1.0f, -1.0f, -1.0f)); // 后右下
    vertices->push_back(osg::Vec3( 1.0f,  1.0f, -1.0f)); // 后右上
    vertices->push_back(osg::Vec3(-1.0f,  1.0f, -1.0f)); // 后左上
    geometry->setVertexArray(vertices);

    // 定义法线
    osg::Vec3Array* normals = new osg::Vec3Array;
    normals->push_back(osg::Vec3( 0.0f,  0.0f,  1.0f)); // 前
    normals->push_back(osg::Vec3( 0.0f,  0.0f, -1.0f)); // 后
    normals->push_back(osg::Vec3( 1.0f,  0.0f,  0.0f)); // 右
    normals->push_back(osg::Vec3(-1.0f,  0.0f,  0.0f)); // 左
    normals->push_back(osg::Vec3( 0.0f,  1.0f,  0.0f)); // 上
    normals->push_back(osg::Vec3( 0.0f, -1.0f,  0.0f)); // 下
    geometry->setNormalArray(normals, osg::Array::BIND_PER_PRIMITIVE_SET);

    // 定义6个面（12个三角形）
    osg::DrawElementsUInt* faces = new osg::DrawElementsUInt(osg::PrimitiveSet::TRIANGLES, 0);

    // 前面
    faces->push_back(0); faces->push_back(1); faces->push_back(2);
    faces->push_back(2); faces->push_back(3); faces->push_back(0);

    // 后面
    faces->push_back(5); faces->push_back(4); faces->push_back(7);
    faces->push_back(7); faces->push_back(6); faces->push_back(5);

    // 右面
    faces->push_back(1); faces->push_back(5); faces->push_back(6);
    faces->push_back(6); faces->push_back(2); faces->push_back(1);

    // 左面
    faces->push_back(4); faces->push_back(0); faces->push_back(3);
    faces->push_back(3); faces->push_back(7); faces->push_back(4);

    // 上面
    faces->push_back(3); faces->push_back(2); faces->push_back(6);
    faces->push_back(6); faces->push_back(7); faces->push_back(3);

    // 下面
    faces->push_back(4); faces->push_back(5); faces->push_back(1);
    faces->push_back(1); faces->push_back(0); faces->push_back(4);

    geometry->addPrimitiveSet(faces);
    geode->addDrawable(geometry);

    return geode.release();
}

MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent)
    , ui(new Ui::MainWindow)
{
    ui->setupUi(this);

    osgWidget = findChild<osgQOpenGLWidget*>("openGLWidget");
}

MainWindow::~MainWindow()
{
    delete ui;
}


void MainWindow::on_pushButton_clicked()
{
    osgViewer::Viewer *viewer = osgWidget->getOsgViewer();
    viewer->setSceneData(createCube());
    viewer->setCameraManipulator(new osgGA::TrackballManipulator);
    viewer->getCamera()->setViewport(0, 0, osgWidget->width(), osgWidget->height());
    viewer->getCamera()->setClearColor(osg::Vec4(0.1, 0.1, 0.3, 1.0));  // 深蓝色背景

    // 设置摄像机视角
    viewer->getCamera()->setViewMatrixAsLookAt(
           osg::Vec3d(0,5,5),  // 视点
           osg::Vec3d(0,0,0),  // 中心点
           osg::Vec3d(0,0,1)   // 上方向
    );
}


void MainWindow::showEvent(QShowEvent *event)
{
    on_pushButton_clicked();
}

main.cpp

#include "mainwindow.h"

#include <QApplication>

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    MainWindow w;
    w.show();
    return a.exec();
}

xxx.pro

QT       += core gui

greaterThan(QT_MAJOR_VERSION, 4): QT += widgets

CONFIG += c++11

# The following define makes your compiler emit warnings if you use
# any Qt feature that has been marked deprecated (the exact warnings
# depend on your compiler). Please consult the documentation of the
# deprecated API in order to know how to port your code away from it.
DEFINES += QT_DEPRECATED_WARNINGS

# You can also make your code fail to compile if it uses deprecated APIs.
# In order to do so, uncomment the following line.
# You can also select to disable deprecated APIs only up to a certain version of Qt.
#DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000    # disables all the APIs deprecated before Qt 6.0.0

SOURCES += \
    main.cpp \
    mainwindow.cpp

HEADERS += \
    mainwindow.h

FORMS += \
    mainwindow.ui

INCLUDEPATH += F:/develop/OpenSceneGraph-3.6.5/include
INCLUDEPATH += F:/develop/osgQt/include

win32:CONFIG(release, debug|release): LIBS += -LF:/develop/OpenSceneGraph-3.6.5/lib/ -LF:/develop/osgQt/lib-x64/release/ -losg -lOpenThreads -losgDB -losgGA -losgText -losgUtil -losgWidget -losgViewer -losgQt
else: LIBS += -LF:/develop/OpenSceneGraph-3.6.5/lib/ -LF:/develop/osgQt/lib-x64/debug/ -losgd -lOpenThreadsd -losgDBd -losgGAd -losgTextd -losgUtild -losgWidgetd -losgViewerd -losgQt

# Default rules for deployment.
qnx: target.path = /tmp/$${TARGET}/bin
else: unix:!android: target.path = /opt/$${TARGET}/bin
!isEmpty(target.path): INSTALLS += target

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