hi Robert , Thanks for your help. I didn't describe my problem clearly.I want wo konw something about OSG thread model.Take the single thread model for enstance,the time of one frame is the sum of event,update,cull and draw .Does it include the GPU draw time?(I am not sure,but I think it doesn't).So ,if the first frame's draw() function is finished,the second frame's event() function will be executed immediately no matter the GPU finishes all the OpenGL commands(am I right?).And if the GPU draw time is longer than the frame time,maybe the first frame's opengl commands haven't been finished ,the second frame's opengl commands will come.Will that happen? best regards forest
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