OSG在QT的中显示之二

最新推荐文章于 2024-10-03 19:13:18 发布

wb175208

最新推荐文章于 2024-10-03 19:13:18 发布

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分类专栏： osg 文章标签： QT

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本文介绍如何使用QT显示OSG(OpenSceneGraph)模型。通过创建一个QT窗口，并利用OSG进行三维场景渲染，实现模型的加载与显示。文中详细展示了设置OpenGL上下文、相机配置及模型加载的过程。

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利用QT在界面显示OSG模型，之前写过一篇文章OSG在QT的中显示，现在更新一下。
在这里插入图片描述

#include <QtWidgets/QMainWindow>
#include "ui_QtGuiOSG.h"
#include "osgInc.h"


class QtGuiOSG : public QMainWindow {
	Q_OBJECT

public:
	QtGuiOSG(QWidget *parent = Q_NULLPTR);

private:
	void init();

	osg::LightSource* createLight();

private slots:
	void slotTimeUpdate();
private:
	Ui::QtGuiOSGClass ui;

	osgViewer::Viewer* _viewer = nullptr;
	unsigned int _screenW, _screenH;
	QTimer* _timer;
};

#include "QtGuiOSG.h"
#include <osg/GraphicsContext>
#include "GraphicsWindowQt.h"
#include <QTimer>

QtGuiOSG::QtGuiOSG(QWidget *parent)
	: QMainWindow(parent) {
	ui.setupUi(this);
	init();

}

void QtGuiOSG::init() {
	osg::GraphicsContext::WindowingSystemInterface* wsi = osg::GraphicsContext::getWindowingSystemInterface();
	if (!wsi) {
		osg::notify(osg::NOTICE) << "Error, no WindowSystemInterface available, cannot create windows." << std::endl;
		return ;
	}

	wsi->getScreenResolution(osg::GraphicsContext::ScreenIdentifier(0), _screenW, _screenH);
	

	osg::DisplaySettings* ds = osg::DisplaySettings::instance().get();

	osg::ref_ptr<osg::GraphicsContext::Traits> traits = new osg::GraphicsContext::Traits;
	traits->x = 0;
	traits->y = 0;
	traits->width = _screenW;
	traits->height = _screenH;
	traits->windowDecoration = false;
	traits->doubleBuffer = true;
	traits->sharedContext = 0;

	traits->alpha = ds->getMinimumNumAlphaBits();
	traits->stencil = ds->getMinimumNumStencilBits();
	traits->sampleBuffers = ds->getMultiSamples();

	traits->samples = 16;
	traits->vsync = false;

	osg::GraphicsContext* gc = new GraphicsWindowQt(traits.get());

	osg::ref_ptr<osg::Camera> camera = new osg::Camera;
	camera->setGraphicsContext(gc);
	camera->setClearMask(GL_DEPTH_BUFFER_BIT | GL_COLOR_BUFFER_BIT);
	camera->setViewport(new osg::Viewport(0, 0, _screenW, _screenH));
	camera->setClearColor(osg::Vec4(128.0 / 255.0, 128.0 / 255.0, 128.0 / 255.0, 0.8));
	camera->setProjectionMatrixAsPerspective(30.0, static_cast<double>(_screenW) / static_cast<double>(_screenH), 1.0, 10000.0);

	_viewer = new osgViewer::Viewer;
	osg::ref_ptr<osg::Group> root = new osg::Group;
	root->addChild(osgDB::readNodeFile("cow.osgt"));//注意：这两句话的先后顺序 先添加模型在添加相机
	root->addChild(createLight());
	_viewer->setCamera(camera);//这两句话的先后顺序
	_viewer->setSceneData(root);
	_viewer->setThreadingModel(osgViewer::Viewer::SingleThreaded);
	_viewer->setCameraManipulator(new osgGA::TrackballManipulator);
	_viewer->addEventHandler(new osgViewer::WindowSizeHandler());

	GraphicsWindowQt* gcQT = dynamic_cast<GraphicsWindowQt*>(gc);
	if (gcQT){
		QWidget *pWgt = gcQT->getGLWidget();
		ui.verticalLayout->addWidget(pWgt);
	}
	

	_timer = new QTimer;
	connect(_timer, SIGNAL(timeout()), this, SLOT(slotTimeUpdate()));
	_timer->start(5);
}

osg::LightSource* QtGuiOSG::createLight() {
	osg::LightSource* ls = new osg::LightSource;

	osg::ref_ptr<osg::Light> light = new osg::Light;
	light->setLightNum(0);
	light->setPosition(osg::Vec4(0.0, -3.0, 0.0, 0.0));
	light->setDirection(osg::Vec3(0.0, -1.0, 0.0));
	light->setDiffuse(osg::Vec4(0.0, 0.0, 1.0, 1.0));
	ls->setLight(light);
	return ls;
}

void QtGuiOSG::slotTimeUpdate() {
	_viewer->frame();
}

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