Ümit Uzun,
I would suspect that the problem you described is related more with you
graphics card then with the size of the window you are rendering into. It
sounds like, in your case, the larger window size would cause more raster
operations to be performed, while decreasing the size of the window would cause
fewer raster operation to be performed.
Forest,
I cannot give you much advice on how to improve the performance when I do not
know much about your current implementation. I will assume that your MFC
application is trying to get to 60 FPS. With this assumption, your application
will only have ~16 ms to do even, update, cull, and draw traversals and merge
any databases, assuming you are using the pager. If your event traversal is
taking longer than you want, you might think of adding a worker thread at a
lower priority that can process the data and report to the render thread,
several frames later, when the job has finished and can be merged. This
assumes you are not working on an active part of the scene graph already.
Also, you are working with two different threads. This means you will have a
GUI thread and the rendering thread. There might be extra safeguards ( mutex
locks ) that are going on behind the scenes. The best thing to do is move the
creation of the window to the rendering thread. By doing this, all messages
that are sent to this window will be on the same thread as the rendering
thread. This way you can manipulate the scene graph without having to push
data into the event handler, but this will also break portability if you decide
to have cross platform code.
Ryan H. Kawicki
The Boeing Company
Training Systems & Services
Software Engineer
________________________________
From: Ümit Uzun [mailto:umituzu...@gmail.com]
Sent: Friday, July 10, 2009 7:53 AM
To: OpenSceneGraph Users
Subject: Re: [osg-users] what is the thread difference between MFC
andconsole?
Hi Forest;
We have same problem and I find that threading isn't actual problem.
real one is rendering on specified HWND. And frame rate always gets down while
enlarging the HWND size contrary if you collapse the HWND size you can see
easily that frame rate gets upper degree than wide one. I suspect that low
frame rate is caused by rendering on specified HWND. If you really need to
render on MFC control(i.e PictureBox) you should narrow you HWND control size
to get high frame rate.
Regards.
Ümit Uzun
2009/7/10 forest <fores...@163.com>
hi all,
I have a problem with OSG in MFC program:When I run my
program in console, I get 60 frames per second .However,When I move my program
into MFC, I get slow frames.I do this as the example osgviewerMFC does,
creating a new thread for OSG drawing. One thing I have to mention is that
there is some time-consuming algorithms in my event handler .
What should I do to improve my program in MFC?
Thanks in advance.
Best regards.
forest
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