Hello:
Which Qt are you using? I was using 4.1.4 and the rate was good but
when I upgraded to 4.2.x the rate was very bad. So this made me move
back to 4.1.4. The other problem is we are going through timer
events which have has it's own overhead and have no control over this
within the application. I made a similar statement a few weeks ago
and was suggested to maybe try to re-write using a threaded loop.
This would give the control you need to achieve the framewrate
desired since it elliminates the GUI overhead of Timer events. Just
haven't tested the safety of this within Qt and it's QGlWidget and to
see what needs to be locked for entry. I think the updates and culls
are Ok but am unclear how the effect of the draw routine within this
type of setup until I try it.
Take care
Garrett
On Dec 19, 2006, at 7:11 AM, xiaoshuxing wrote:
Hi, everyone
I found that simplerviewerQT4 can’t show the framerate like
osgProducer::viewer, so I wrote one myself, it’s basically a
GUIEventHandler.
But, it’s so weird that the text just don’t show out.
The calculation is finished, which I have traced down.
I have set a breakpoint in the drawimplementation of osgText::text,
however, it seems that this drawimplementation is not executed.
The source code of my eventhandler is as following:
bool MyEventHandler::handle(const osgGA::GUIEventAdapter &ea,
osgGA::GUIActionAdapter &aa)
{
if(!_firstFrame.valid())
{
_firstFrame = new osg::FrameStamp;
*_firstFrame = *(_sceneView->getFrameStamp());
_lastFrame = new osg::FrameStamp;
*_lastFrame = *_firstFrame;
}
if(true) // make the display or not an user interface later
{
if(ea.getEventType()==osgGA::GUIEventAdapter::FRAME)
{
char frText[128];
osg::ref_ptr<osg::FrameStamp> currentFrame =
new osg::FrameStamp;
*currentFrame = *(_sceneView->getFrameStamp());
if (currentFrame->getFrameNumber()==_lastFrame-
>getFrameNumber())
{
return false;
}
double timePerFrame = currentFrame-
>getReferenceTime() - _lastFrame->getReferenceTime();
sprintf(frText,"%4.2f",1.0/timePerFrame);
_frameRateCounterText->setText(frText);
_frameRateLabelText->drawImplementation
(_sceneView->getRenderInfo());
_frameRateCounterText->drawImplementation
(_sceneView->getRenderInfo());
//std::cout << 1.0/timePerFrame << std::endl;
_lastFrame = currentFrame;
}
}
return false;
}
And there’s another weird thing, I put my frame rate result to the
console, and I found that the highest framerate is only 40 fps even
when I’m not drawing anything.
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