If I setRunMaxFrameRate() when using GraphicsWindowQt and setViewer(), frame()
never gets called in GraphicsWindowQt's HeartBeat::timerEvent(). The code for
this method follows:
Code:
if( viewer->getRunMaxFrameRate() > 0.0)
{
double dt = _lastFrameStartTime.time_s();
double minFrameTime = 1.0 / viewer->getRunMaxFrameRate();
if (dt < minFrameTime)
OpenThreads::Thread::microSleep(static_cast<unsigned
int>(1000000.0*(minFrameTime-dt)));
}
else
{
// avoid excessive CPU loading when no frame is required in ON_DEMAND
mode
if( viewer->getRunFrameScheme() == osgViewer::ViewerBase::ON_DEMAND )
{
double dt = _lastFrameStartTime.time_s();
if (dt < 0.01)
OpenThreads::Thread::microSleep(static_cast<unsigned
int>(1000000.0*(0.01-dt)));
}
// record start frame time
_lastFrameStartTime.setStartTick();
// make frame
if( viewer->getRunFrameScheme() == osgViewer::ViewerBase::ON_DEMAND )
{
if( viewer->checkNeedToDoFrame() )
{
viewer->frame();
}
}
else
{
viewer->frame();
}
}
Notice that if the first if-statement is true, frame() can never be called!
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Read this topic online here:
http://forum.openscenegraph.org/viewtopic.php?p=44281#44281
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