Hi, I implemented picking by rendering each object with a unique color ID to a texture. A lookup in the texture on the mouse cursor position then gives the color id of the selected object. When the user performs a mouse click, I need to update the picking texture. To avoid unnecessary rendering, I want to update only the picking texture and not all other cameras. I found that this simple task (taking a picture with one RTT camera without updating the others) is difficult to implement in OSG, because GraphicsContext::runOperations renders images for all cameras attached to the context. Of course I could use a seperate context for the picking, but that shouldn't be necessary in my opinion. I managed to implement what I want by adding and removing cameras to the context on the fly, but is this a good way to do this? For example, in GraphicsContext::removeCamera the function releaseGLObjects is called and I'm not sure how this could impact performance.
Thank you! Cheers, Andreas ------------------ Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=57958#57958 _______________________________________________ osg-users mailing list [email protected] http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
