Hello Shuiying,
Hello, Sebastian
my model is simple 3D model like car (1MB), house(2~7MB).
That still says sort of nothing about the model ...
This application is a car simulator within the framework of OROCOS,
which is a multi-task real time toolkit. OSG is used to display the
simulator.
I took a look at the "root" code just now (I only here take over the
half done job of someone else:-( ).
it shows that there is:
a Qlist of View3D, which is derived from QOsgWidget and osgViewer.
whenever there is a new subscenegraph (osg::group node), it will be
added to a view3D(because it has a osg::group as a member);
at the same time the cameraNode of this subscenegraph will be
collected by a cameraCollector; (so that all camera will be
controlled to act coherent)
Then this view3D(as a QOsgWidget) will be added to QMainFrame.
I think this following line of source code may help explain the problem:
connect(&mTimer, SIGNAL(timeout()), this, SLOT(updateGL()));
mTimer.setInterval(30);
mTimer.start();
So the scene update rate is not controlled by GPU or something, it is
controlled by QT timer, that is disappointing.:-(
You're right.
The problem is that timer will fire every 30ms which should give you
around 33Hz maximum (effectively it will fire around twice the time your
OS schedulers minimum thread time).
Anyways, for the maximum framerate try setInterval 0 or 1.
Am I right here?
So is there a way to get higher "FPS" based on this condition?
That depends. You reported 300ms per update, which is 3 FPS, so
increasing the frame rate is not purely based on your timer.
First of all: Is your project running in debug or release mode? If it is
debug I strongly suggest measuring any timings in release only, as the
debug overhead is huge.
If you're already running release the problem is most likely in your
models. There is just no general suggestion how to improve rendering
time, as it mainly depends on the scenegraph's structure.
Maybe running an optimizer on the model will fix some of the major problems.
In order to see if there is a framework induced penalty you should try
to load a model with the osgviewer and check the framerate there (just
press 's' to see the framerate and other statistics). If the framerate
there is much higher than in your application, there most likely is a
problem in your application. If not, your model is quite heavy.
If you wont mind sharing one of the models (you can also send it to my
private address if you don't want to make it public) I can see what are
my results here with my renderer.
cheers
Sebastian
Thanks a lot in advance!
Shuiying
On 02/04/2012 09:47 PM, Sebastian Messerschmidt wrote:
Hello Shuiying
You didn't tell us what kind of models. If I would add 51 of my
terrain models i'd be happy to get 3 frames ;-)
Also you didn't tell us what your application is ... more or less
only a osgviewer?
In case you provide a little more detail you probably get some
answers/help
cheer
Sebastian
Hello,
This is somehow frustrating, if the rendering rate is the same with
update rate.
I check the update interval of the sceneNode in my application, it
turns out to be 300ms.
I only attach 51 3D models in my application.
when there is only 5 3D models, the interval is 70ms.
I just wonder whether it is normal or not?
And update rate is the same with rendering rate?
Thank you very much for any advice!
shuiying
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