OpenSceneGraph中的窗体模式运行是怎样的,很多新手对此不是很清楚,为了帮助大家解决这个难题,下面小编将为大家详细讲解,有这方面需求的人可以来学习下,希望你能有所收获。
1.使用osgViewer::Viewer代替原来的osgProducer::Viewer 2.先熟悉设计模式,比如最常用的Visitor设计模式。要不然看不懂程序不说,而且更写不出程序。 3.窗体模式运行参考Example osgWindows,在这个例子中重点在于:
osg::ref_ptr traits = new osg::GraphicsContext::Traits;
traits->x = 640;
traits->y = 0;
traits->width = 640;
traits->height = 480;
traits->windowDecoration = true;
traits->doubleBuffer = true;
traits->sharedContext = 0;
osg::ref_ptr gc = osg::GraphicsContext::createGraphicsContext(traits.get());
osg::ref_ptr camera = new osg::Camera;
camera->setGraphicsContext(gc.get());
camera->setViewport(new osg::Viewport(0,0, traits->width, traits->height));
GLenum buffer = traits->doubleBuffer ? GL_BACK : GL_FRONT;
camera->setDrawBuffer(buffer);
camera->setReadBuffer(buffer);
// add this slave camra to the viewer, with a shift right of the projection matrix
viewer.addSlave(camera.get(), osg::Matrixd::translate(-1.0,0.0,0.0), osg::Matrixd());
另外Example osgkeyboardmouse也提到了另外一种方式:
// create the window to draw to.
osg::ref_ptr traits = new osg::GraphicsContext::Traits;
traits->x = 200;
traits->y = 200;
traits->width = 800;
traits->height = 600;
traits->windowDecoration = true;
traits->doubleBuffer = true;
traits->sharedContext = 0;
osg::ref_ptr gc = osg::GraphicsContext::createGraphicsContext(traits.get());
osgViewer::GraphicsWindow* gw = dynamic_cast(gc.get());
if (!gw)
{
osg::notify(osg::NOTICE)<<"Error: unable to create graphics window."<
return 1;
}
gw->realize();
gw->makeCurrent();
// create the view of the scene.
osgViewer::SimpleViewer viewer;
viewer.setSceneData(loadedModel.get());
viewer.setEventQueue(gw->getEventQueue());
viewer.getEventQueue()->windowResize(traits->x,traits->y,traits->width,traits->height);
TODO: 1.3DS导入插件还不够完善,需要自己写。 2.更深入的了解OSG的机制。
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原文链接:https://my.oschina.net/u/4874701/blog/4909627