Hi J-S,
Try this:
void QOsgScene::drawBackground ( QPainter * painter, const QRectF & rect )
{
if (m_redrawEnabled == false){
return;
}
emit aboutToDraw();
// Only works with OpenGL
if( painter->paintEngine()->type() == QPaintEngine::OpenGL )
{
GLenum errorNo;
// Qt OpenGL State Initialization takes
// place before we get here, on every frame.
// We can assume that OpenGL state is reset to
// default on every frame.
// Push initialized state onto the stack so that we can
// Recover it later for further Qt Drawing.
glPushAttrib(GL_ALL_ATTRIB_BITS);
glPushClientAttrib(GL_CLIENT_ALL_ATTRIB_BITS);
// Fixup stuff that Qt Modifies from default state that
// OSG expects.
glShadeModel(GL_SMOOTH);
// Push matricies
glMatrixMode(GL_TEXTURE);
glPushMatrix();
glLoadIdentity();
glMatrixMode(GL_PROJECTION);
glPushMatrix();
glLoadIdentity();
glMatrixMode(GL_MODELVIEW);
glPushMatrix();
glLoadIdentity();
// Make sure that OSG's state is prepared based on the last
state
// recorded (if available). The first frame is different.
osg::State *state =
getCamera()->getGraphicsContext()->getState();
state->reset();
state->apply(m_lastStateSet.get());
// Run a frame: this is where the action happens.
frame();
// Store the OSG state for restoration in the next frame.
getCamera()->getGraphicsContext()->getState()->captureCurrentState(*m_lastStateSet);
// Pop matricies.
glMatrixMode(GL_PROJECTION);
glPopMatrix();
glMatrixMode(GL_TEXTURE);
glPopMatrix();
glMatrixMode(GL_MODELVIEW);
glPopMatrix();
// Pop Attribs, now we're ready to continue
// Drawing with OpenGL.
glPopAttrib();
glPopClientAttrib();
errorNo = glGetError();
if (errorNo!=GL_NO_ERROR)
{
LOG_MSG(logERROR) <<"Post-Frame: Detected OpenGL error
(frame " <<
m_frameNo << ") '" <<gluErrorString(errorNo) << "'";
}
++m_frameNo;
}
else
{
qWarning("QOsgScene: drawBackground needs a QGLWidget to be set
as
viewport on the graphics view.");
}
}
_________________________________________________________
Sean Spicer
Executive Vice President & Chief Technology Officer
Aqumin (www.aqumin.com)
Office....+1.281.466.4848
Mobile...+1.713.447.2706
Fax.......+1.281.466.4849
On Tue, Apr 21, 2009 at 1:28 PM, Jean-Sébastien Guay
<[email protected]> wrote:
> Hello Christian,
>
>> I have run into another problem. With my current approach the scene
>> loses all lighting after
>> the first frame has been drawn. All polygons appear in flat shading. I
>> have currently no idea what is causing this. At first I was not
>> noticing this because I rendered cow.osg which uses a metallic effect
>> (environment maps?). But on other scenes the loss of lighting is
>> apparent.
>
> This suggests that when pushing and popping state in order for Qt to draw
> its widgets, something is not pushed/popped correctly, probably GL_LIGHTING,
> GL_LIGHT0-GL_LIGHT7 or something like that? Perhaps glShadeModel? ...
>
> Just a possible avenue for investigation. I know it sounds obvious, but the
> error is obviously caused by something you overlooked, so listing things
> that should not be overlooked seems like the only way I can help... :-)
>
> J-S
> --
> ______________________________________________________
> Jean-Sebastien Guay [email protected]
> http://www.cm-labs.com/
> http://whitestar02.webhop.org/
> _______________________________________________
> osg-users mailing list
> [email protected]
> http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
>
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