Hi Stephen, Have a look at the osgscreencapture example for efficient streaming of rendered images to the CPU.
Robert. On Tue, Sep 23, 2008 at 5:44 PM, <[EMAIL PROTECTED]> wrote: > > I need to update an OSG based app that performs screen capture. The > existing app used OSG 1.x and readPixels. It worked but I would like to > move to 2.6+ and improve efficiency. I am looking into the alternatives, > but don't currently have the target hardware. > > Can any give insight into the benefits of the different means of getting a > screen capture that can be transferred back to CPU/main memory? > The app uses OSG to model a camera on the network and streams jpeg images > at a target of 30Hz to client nodes. > > I have looked at the old and new prerender example (the existing app is > largely based on the 1.x version of prerender). > I have researched Frame Buffers, FBOs, PBOs, and the traditional > readPixels. Which of these is likely to be best for the described use? > Is this complicated at all if this is done using MPV which uses OSG with > SDL? > > I have searched Google and the mailing list archives, read the FAQ, and > read "How-to-ask Questions the Smart Way", but have yet to find an answer I > understand. > > We also have a somewhat different usecase which grabs the depth buffer > (again with readPixels) from an orthographic projection above the current > location on the terrain. We use the depth buffer image and the linear > scale of the ortho projection to convert to distance/height values. This > provides image width*height number of samples quite quickly, which we then > have any system memory. We currently process this on the CPU and send > terrain elevation information to a separate dynamics app (potentially on a > different machine). I am starting to investigate what could be done on the > GPU to improve this process. > > Thanks for any tips. > > Stephen Haithcock > General Dynamics Land Systems > 38500 Mound Rd. > Sterling Heights, MI 48310 > MZ 436-40-15 > (586) 825-8573 > > > > > This is an e-mail from General Dynamics Land Systems. It is for the intended > recipient only and may contain confidential and privileged information. No > one else may read, print, store, copy, forward or act in reliance on it or > its attachments. If you are not the intended recipient, please return this > message to the sender and delete the message and any attachments from your > computer. Your cooperation is appreciated. > > _______________________________________________ > 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
