Hi, I am looking to use OpenSceneGraph to simulate multi-camera images in real time, but my frame rates are not great with the number of cameras I need. I currently have 6 cameras rendering to 640x480 images and I see ~8fps max, with a lot of jitter.
The osg examples have been a great help, but I wanted to ask for general advice before I dig too much deeper. Everything I have read indicates that GPU->CPU is a very slow operation, but I am wondering if I am actually maxed out or just doing something dumb. Here is my setup for N cameras: 0. Populate the scene with objects 1. Create the N osg::Cameras with RenderTargetImplementation of FRAME_BUFFER_OBJECT (PIXEL_BUFFER doesn't work for me yet) 2. Create N rgb 640x480 osg::Images and attach to the cameras 3. Add my scene to each camera 4. Add draw callbacks to each camera. 5. Add each camera to a root scene. 6. Create a viewer with the root scene. Now in a custom main loop, I do the following: 0. Read the requested camera poses from a message queue 1. Adjust the pose of each camera 2. Viewer.frame() 3. Each camera callback will fire 4. When all camera callbacks have fired, I read .data() from each Image. 5. Publish the N images in a single message, which gets serialized and sent over UDP to other processes. I still need to profile this to see where the bottleneck is, but my hunch is that I can speed up by rendering and reading the data from each camera independently instead of simultaneously. I am not sure how to do it yet, but I assume "Pixel Buffer Objects" will be part of the answer. Any suggestions on where to start would be appreciated! Cheers, Matt ------------------ Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=63398#63398 _______________________________________________ osg-users mailing list [email protected] http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
