Hi, I currently try to render a setup of multiple cameras off screen in order to read them to an osg::Image (raw data of some kind would be enough - I know how to convert it to an osg::Image). The point is, I want those cameras to be nicely arranged (the way I can arrange them on other graphics contexts like osgViewer::CompositeViewer) I tried different approaches but none worked so far. The simplest one would be:
osg::GraphicsContext::Traits* t = new osg::GraphicsContext::Traits(); t->x = 1; t->y = 1; t->width = 1024; t->height = 692; t->pbuffer = true; pb = new osgViewer::PixelBufferWin32(t); camera->setGraphicsContext(pb); camera->setRenderTargetImplementation(osg::Camera::FRAME_BUFFER); camera->setViewport(new osg::Viewport(x0,y0,w,h)); ... frame(); img->readPixels(0, 0, width, height, GL_BGRA, GL_UNSIGNED_BYTE); do_something(img); Another approached was using PBOs. Something like: img = new osg::Image; img->allocateImage(1024,692,1,GL_BGRA,GL_UNSIGNED_BYTE); osg::GraphicsContext::Traits* t = new osg::GraphicsContext::Traits(); t->x = 1; t->y = 1; t->width = 1024; t->height = 692; t->pbuffer = true; pb = new osgViewer::PixelBufferWin32(t); pb->getState()->setCurrentPixelBufferObject(img->getPixelBufferObject); camera->setGraphicsContext(pb); camera->setRenderTargetImplementation(osg::Camera::FRAME_BUFFER_OBJECT); camera->setViewport(new osg::Viewport(x0,y0,w,h)); ... pb->getState()->bindPixelBufferObject(img->getPixelBufferObject); frame(); do_something(img); pb->getState()->unbindPixelBufferObject(img->getPixelBufferObject); But this doesen't work either. Had some other approaches too, but those threw OpenGL errors claiming some operation is not supported... I'm kind of stuck with this. I know the data is some where - things like attaching an image to a camera and reading it work - but I just can't find it. I would be really thankful for at least a hint. Matthias _______________________________________________ osg-users mailing list [email protected] http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
