Hi,
I'm writing a small test program (source below) that is doing its own viewer
loop. This program runs fine if I run it using viewerWindow->show. If I run
it with my own viewer loop it crashes the fist time it calls frame with a
Segmentation fault in osg::LightModel::apply (see stack trace below).
OSG v 2.8.1
Qt 4 (Eclipse integration version 1.6.1) environment
Linux using Eclipse in debug mode
I got ViewerQT from the Qt integration example AdapterWidget.cpp.
I got the viewer loop code from the Quick Start Guide. I noticed some examples
had viewerWindow->realize in them so I tried it with and without that. It
didn't make any difference.
Any ideas of what the problem is?
ViewerQT *viewerWindow = new ViewerQT;
viewerWindow->setCameraManipulator (new osgGA::TrackballManipulator);
viewerWindow->setSceneData
(osgDB::readNodeFile("/home/zacharyh/OpenSceneGraph-Data-2.8.0/cow.osg"));
// display the scene graph /////////////////////
#define loop
#ifndef loop
viewerWindow->show ();
#else
viewerWindow->getCamera ()->setProjectionMatrixAsPerspective (40., 1., 1., 60.
* 36.);
// Create a matrix to specify a distance from the viewpoint.
osg::Matrix trans;
trans.makeTranslate (0., 0., 0.);
double angle (0.); // Rotation angle (in radians)
viewerWindow->realize (); // crashes with and without this
while ( ! viewerWindow->done ())
{ // do view loop
// Create the rotation matrix.
osg::Matrix rot;
rot.makeRotate (angle, osg::Vec3 (0., 0., 1.));
// angle += 0.01;
// Set the view matrix (the concatenation of the rotation and
// translation matrices).
viewerWindow->getCamera ()->setViewMatrix (rot * trans);
// Draw the next frame.
viewerWindow->frame ();
} // do view loop
#endif
a.connect (&a, SIGNAL (lastWindowClosed ()), &a, SLOT (quit ()));
return a.exec ();
gdb Debugger (6/9/10 10:15 AM) (Suspended)
Thread [1] (Suspended: Signal 'SIGSEGV' received. Description:
Segmentation fault.)
18 osg::LightModel::apply(osg::State&) const() 0x0027778a
17 osg::State::applyAttribute() 0x002d33b0
16 osg::State::applyAttributeList() 0x002d3613
15 osg::State::apply() 0x002ce9b1
14 osgUtil::RenderLeaf::render() 0x016f6b1e
13 osgUtil::RenderBin::drawImplementation() 0x016f0d13
12 osgUtil::RenderStage::drawImplementation() 0x016f93c4
11 osgUtil::RenderBin::draw() 0x016f09a0
10 osgUtil::RenderStage::drawInner() 0x016f9776
9 osgUtil::RenderStage::draw() 0x016fd51d
8 osgUtil::SceneView::draw() 0x017065af
7 osgViewer::Renderer::cull_draw() 0x00480cb0
6 osgViewer::Renderer::operator()() 0x0047e208
5 osg::GraphicsContext::runOperations() 0x0024b928
4 osgViewer::ViewerBase::renderingTraversals() 0x004bfb42
3 osgViewer::ViewerBase::frame() 0x004bd8dd
2 shotTrail()
/home/zacharyh/workspace/osgViewerQt/ShotTrail.cpp:86 0x0805454d
1 main() /home/zacharyh/workspace/osgViewerQt/main.cpp:40
0x0805edf5
Thank you!
Cheers,
Zachary
------------------
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http://forum.openscenegraph.org/viewtopic.php?p=28752#28752
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