> >Glad you got it working! > > >Is there a reason you didn't just attach an osg::Texture to your camera > >and set the number of samples greater than 1 in the attach call?
Well I did attach a texture to my camera and set the number of samples greater than 1...see: osg::ref_ptr<osg::TextureRectangle> offscreenTexture = new osg::TextureRectangle; offscreenTexture->setTextureSize(WIDTH, HEIGHT); offscreenTexture->setFilter(osg::TextureRectangle::MIN_FILTER,osg::Texture2D::LINEAR); offscreenTexture->setFilter(osg::TextureRectangle::MAG_FILTER,osg::Texture2D::LINEAR); offscreenTexture->setSourceFormat(GL_RGBA); offscreenTexture->setSourceType(GL_FLOAT); offscreenTexture->setInternalFormat(GL_FLOAT_RGBA32_NV); osg::Camera* camera=m_viewer->getCamera(); camera->setClearColor(osg::Vec4f(0,0.0f,0.0f,1.0f)); camera->setClearMask(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); camera->setRenderTargetImplementation(osg::Camera::FRAME_BUFFER_OBJECT); camera->attach(osg::Camera::COLOR_BUFFER0, offscreenTexture.get(),0,0,false,8,4); then in my draw call back I just get the resolved fbo that osg fills with the glBlitFramebufferEXT call. This seems to work, I don't know if there is better or "cleaner" solution to my problem. By the way I was wondering why osg do not bind the resolved fbo instead of the multisampled fbo in order to allow subsequent glReadPixels call. If not I don't understand why the glBlitFramebufferEXT is automatically performed. > > >By the way, if you change OpenGL state, be careful that you restore the > >previous state or tell OpenSceneGraph about the changes you make (via > >haveAppliedMode(), haveAppliedAttribute(), etc.); otherwise > >OpenSceneGraph will get confused about what the current OpenGL state is. > you are refering to the binding call ( fbo->apply(state,osg::FrameBufferObject::READ_FRAMEBUFFER))? As I said before I'm not sure if my approach is the best one. I just looked at the osg code and found a way to get my own working. I saw (with your held) that a resolved fbo was automatically generated when drawing to a multisampled fbo so I just get it in my draw callback (getMultisampleResolveFramebufferObject()) then bind it in order to be able to read it. Jonathan
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