Hi again, I should problably add one note here: One may say that Camera has getView method. This method returns NULL for graph nested cameras. I pressume its valid only for main views and slaves.
Cheers, Wojtek -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Behalf Of Wojciech Lewandowski Sent: Thursday, February 28, 2008 9:07 PM To: OpenSceneGraph Users Subject: Re: [osg-users] Camera POST_RENDER vs. postDrawCallback ... whowins? Hi Justin, Look at void osgUtil::RenderStage::draw(osg::RenderInfo& renderInfo,RenderLeaf*& previous) method.(Line 825 in currnt SVN src/osgUtil/RenderStage.cpp). Its all there. 1: Prerender cameras add Prerender stages. Prerender stages are drawn first. Line 833: drawPreRenderStages(renderInfo,previous); 2: Camera::preDrawCallback is called later Line 880: if (_camera && _camera->getPreDrawCallback()) { // if we have a camera with a post draw callback invoke it. (*(_camera->getPreDrawCallback()))(*_camera); } 3: Then Camera graph (its RenderStage) is drawn Lines 891-921: (it has two paths for multithreaded and singlethreaded drawing) Single Threader case is located in: Line 913: drawInner( useRenderInfo, previous, doCopyTexture); 4: Camera::postDrawCallback gets called Line: 943 if (_camera && _camera->getPostDrawCallback()) { // if we have a camera with a post draw callback invoke it. (*(_camera->getPostDrawCallback()))(*_camera); } 5: Post Render stages from PostRender Cameras are drawn (post render HUD is usually drawn as a result of this call): Line: 979 (last line of the method) drawPostRenderStages(renderInfo,previous); So reassuming: Main camera postDrawCallback is always called before your postrender HUD camera preDraw & postDraw callbacks. So you need to use HUD callback but there is a problem of recognizing which view has called it. I agree with you here. I had similar problem recently: there is not enough information passed to DrawCamera callback. Only one parameter - Camera refernce does not allow to identify view nor identify gl context (I was unable to call some GL extension functions in this callback). It sounds like some aditional parameters should be added to Camera::DrawCallback (RenderInfo ?) or Camera should have methods to find cooresponding state and view objects. I am afraid Robert is the only one who can solve this issue. Cheers, Wojtek Lewandowski -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Behalf Of Vican, Justin E. Sent: Thursday, February 28, 2008 6:40 PM To: OpenSceneGraph Users Subject: Re: [osg-users] Camera POST_RENDER vs. postDrawCallback ... whowins? Hi Robert, Thanks for getting back to me. I still seem to be having an issue with this. I've attached 3 simple images illustrating the issue. The text overly should say "MOOOOOOOOOOOO!". When I use a post render HUD camera, it shows up visually correct at runtime (POST_RENDER_Screenshot.jpg), but I can get the overlay text into the frame grab (POST_RENDER_FrameGrab.jpg). However, any combination of NESTED_RENDER and render bins gives me the problem illustrated in NESTED_RENDER_FrameGrab.jpg. The "world space" objects can obscure the HUD items. 1.) I have a viewer (osg::Viewer named "viewer1") with a camera (osg::Camera named "ViewCamera"), and a scene graph that includes a HUD camera (osg::Camera named "HUDCamera") which has its rendering order set to POST_RENDER, and I have added a postDrawCallback to the first camera ("ViewCamera"). This is the frame grabbing callback. Your response to question 1 would indicate to me that the subgraph inside of "HUDCamera" is supposed to draw before the "ViewCamera" postDrawCallback is called. It looks like this is happening in the reverse order. The postDrawCallback of "ViewCamera" is being called before the "HUDCamera" subgraph is rendering which is why I can't see the text in the frame grab. osg::Viewer("viewer1") | osg::View("view1") | osg::Camera("ViewCamera") ->setPostDrawCallback(foo). | osg::Group("SceenRootNode") / \ / \ osg::Group("OtherStuff") osg::Camera("HUDCamera") ->setRenderOrder(POST_RENDER) 2.) I've tried adding a postDrawCallback to the HUD camera, but I'm using the CompositeViewer class so I have potentially N views into the scene. These callbacks are doing pixel reads and saving them to images (frame capturing), so I need the viewport dimensions of the current viewer's camera (not the HUD camera). I'm also controlling the frame grabbing on a per-view basis. At present, the osg::Camera class only allows me to add 1 postDrawCallback, so the HUD cannot support any more than a single callback. I'm trying to work something out with nested callbacks, but I'm having trouble figuring out which viewer has finished rendering by the time the HUD callback is called. Is there any way to know which viewer is currently rendering the scene inside of the osg:Camera::DrawCallback::operator(const osg::camera&) method?. osg::CompositeViewer("CompView") / \ / \ osg::Viewer("viewer1") osg::Viewer("viewer2") | | osg::View("view1") osg::View("view2") | | osg::Camera("ViewCamera1") osg::Camera("ViewCamera2") <- postDrawCallbacks attached to each camera. \ / \ / osg::Group("SceenRootNode") / \ / \ osg::Group("OtherStuff") osg::Camera("HUDCamera") ->setRenderOrder(POST_RENDER) Sorry for the Novel, Justin -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Robert Osfield Sent: Thursday, February 28, 2008 4:22 AM To: OpenSceneGraph Users Subject: Re: [osg-users] Camera POST_RENDER vs. postDrawCallback ... whowins? On Thu, Feb 28, 2008 at 1:05 AM, Vican, Justin E. <[EMAIL PROTECTED]> wrote: Hi Justin, > 1.) Are postDrawCallbacks supposed to be called before the POST_RENDER > camera sub graphs are rendered? A camera post draw callback should be called after its whole subgraph is rendered. > 2.) Is there a way to ensure that the HUD displays are always drawn on > top of the world space objects and make sure that the postDrawCallback will > be called after they are rendered? If the HUD is drawn last why not attach the callback to it? Robert. _______________________________________________ osg-users mailing list [email protected] http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.or g _______________________________________________ osg-users mailing list [email protected] http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org _______________________________________________ osg-users mailing list [email protected] http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
