Hi Brad, I haven't tried this myself, but it might work. Create a separate context/thread that renders the scene to a texture. Once it finishes rendering, use the NV_copy_image extension ( http://developer.download.nvidia.com/opengl/specs/GL_NV_copy_image.txt) to copy the image into the main context containing the HUD. I haven't used the NV_copy_image extension myself, but from my understanding it allows copying texture data between different contexts. I'm not sure if ATI has a similar extension.
Cheers, Farshid On Thu, Apr 28, 2011 at 8:39 AM, Brad Huber <br...@procerus.com> wrote: > Hello, > > > > We currently have an OSG based application which renders at 30-60+ fps on > our development hardware with discrete gpus. Unfortunately we have to be > able to deploy on a wide range of hardware including stuff that is > significantly less capable (Intel GPUs, etc). On some of these slower > platforms we are seeing framerates that are 10-15 fps. This is actually ok > for us with one exception, live video. > > > > We show live video in the scene graph (for now strictly in the HUD). We > have a requirement to make the video render at native speed (~30 fps). I am > looking for a way to make the HUD/video render at 30 fps and let the rest of > the scene graph render at a floating rate (whatever the machine can handle). > > > > How might this be accomplished? Since this is a HUD, obviously it must > ultimately render to the same graphics context, however it doesn’t really > need to respect the depth buffer, etc of the rest of the scene (it should > always render on top). > > > > PS Should I be thinking about render to texture? > > > > Related threads I came across: > > http://forum.openscenegraph.org/viewtopic.php?t=7858 > > > http://lists.openscenegraph.org/pipermail/osg-users-openscenegraph.org/2008-January/006000.html > > http://forum.openscenegraph.org/viewtopic.php?t=7117 > > > > Thanks > > -Brad > > _______________________________________________ > osg-users mailing list > osg-users@lists.openscenegraph.org > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org > >
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