Hi Justin -- Are you clearing the depth buffer before rendering the HUD?
camera->setClearMask(GL_DEPTH_BUFFER_BIT);
-Paul
> 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-opensce
negraph.or
> g
>
_______________________________________________
osg-users mailing list
[email protected]
http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
