Re: [osg-users] Problem with a program in osg qsg
Hi, Brett Thomas Lee wrote: Hi, Thank you! very much.I also have an another question.What is attach in mPreRenderCamera-attach(osg::Camera::COLOR_BUFFER,img.get()); code.If I attach an image to color buffer whenever I update the camera scene does the image gets automatically updated??or Do I need to attach it every frame?? attach only once, see osgprerender example. jp Cheers, Brett -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=17164#17164 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org -- This message is subject to the CSIR's copyright terms and conditions, e-mail legal notice, and implemented Open Document Format (ODF) standard. The full disclaimer details can be found at http://www.csir.co.za/disclaimer.html. This message has been scanned for viruses and dangerous content by MailScanner, and is believed to be clean. MailScanner thanks Transtec Computers for their support. ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Problem with a program in osg qsg
Brett Thomas Lee wrote on Tuesday, September 08, 2009 6:49 PM: Thank you! very much.I also have an another question.What is attach in mPreRenderCamera-attach(osg::Camera::COLOR_BUFFER,img.get()); code.If I attach an image to color buffer whenever I update the camera scene does the image gets automatically updated??or Do I need to attach it every frame?? I'm not certain which meaning of updated you mean here, so I will clarify: the image will not be updated during OSG's update traversal, it is updated during the draw phase. HTH, -- Bryan Thrall FlightSafety International bryan.thr...@flightsafety.com ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Problem with a program in osg qsg
Hi Tim -- In place of viewer.updateTraversal(), simply modify your scene
graph.
Paul Martz
Skew Matrix Software LLC
_http://www.skew-matrix.com_ http://www.skew-matrix.com/
+1 303 859 9466
Tim Allen wrote:
Hi,
Thank you very much for the reply.I also have an another question , in this code
while(!viewer.done())
{
viewer.advance();
viewer.eventTraversal();
viewer.updateTraversal();
viewer.renderingTraversals();
}
if I remove viewer.updateTraversal(); and Is there a way to update the scene without using viewer.updateTraversal??If so how can this be done??
Cheers,
Tim
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Re: [osg-users] Problem with a program in osg qsg
Brett Thomas Lee wrote on Tuesday, September 08, 2009 4:51 PM:
Hi,
Similar to Mr Paul I tried to modify my scene by calling update like
this
viewer.realize();
while(!viewer.done())
{
viewer.advance();
viewer.eventTraversal();
//viewer.updateTraversal();
mtLeft-setUpdateCallback( new RotateCB );
viewer.renderingTraversals();
viewer.setCameraManipulator(new osgGA::TrackballManipulator());
}
But nothing happened!!
If you comment out the update traversal, no update callbacks will be
executed. What Paul was suggesting is doing whatever RotateCB does in
while(!viewer.done()), like so:
viewer.realize();
while(!viewer.done())
{
viewer.advance();
viewer.eventTraversal();
//viewer.updateTraversal();
doRotateCBStuff();
viewer.renderingTraversals();
viewer.setCameraManipulator(new osgGA::TrackballManipulator());
}
--
Bryan Thrall
FlightSafety International
bryan.thr...@flightsafety.com
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Re: [osg-users] Problem with a program in osg qsg
brett01 wrote:
Hi,
I am actually trying the program of callback in osg quick start guide which
rotates the cow using a node callback.
when I change code viewer.run() to
while(!viewer.done())
{
viewer.frame();
}
I am unable to see the models on the screen.What is the diffrence between the
two??
Thank you!
Cheers,
Brett
Please check you've done viewer.realize().
viewer.run() includes realizing step.
VR Lab, Konkuk University, South Korea
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Re: [osg-users] Problem with a program in osg qsg
Hi,
Thank you very much for the reply.I also have an another question , in this code
while(!viewer.done())
{
viewer.advance();
viewer.eventTraversal();
viewer.updateTraversal();
viewer.renderingTraversals();
}
if I remove viewer.updateTraversal(); and Is there a way to update the scene
without using viewer.updateTraversal??If so how can this be done??
Cheers,
Tim
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Read this topic online here:
http://forum.openscenegraph.org/viewtopic.php?p=17128#17128
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Re: [osg-users] Problem with a program in osg qsg
Hi Brett, Kim,
I am actually trying the program of callback in osg quick start guide which
rotates the cow using a node callback.
when I change code viewer.run() to
while(!viewer.done())
{
viewer.frame();
}
I am unable to see the models on the screen.What is the diffrence between the
two??
Please check you've done viewer.realize().
viewer.run() includes realizing step.
Actually, osgViewer::ViewerBase::frame() will call realize() if it
hasn't been called yet. So that's not the problem.
You can check the source code (in this case osgViewer::ViewerBase
contains run() and frame() methods, and osgViewer::Viewer overrides the
run() method) to see exactly what the difference is.
In your case, the difference you're seeing is simply that
osgViewer::run() automatically adds an osgGA::TrackballManipulator to
the viewer, while just calling viewer.frame() yourself doesn't.
int Viewer::run()
{
if (!getCameraManipulator() getCamera()-getAllowEventFocus())
{
setCameraManipulator(new osgGA::TrackballManipulator());
}
setReleaseContextAtEndOfFrameHint(false);
return ViewerBase::run();
}
And the TrackballManipulator centers itself on your scene's contents by
default on the first frame. So the effect you're seeing is just that the
camera is not pointing towards your objects in the viewer.frame() case.
You could add a TrackballManipulator (or some other subclass of
osgGA::MatrixManipulator) to the viewer yourself to get the same
behavior as using run(). Or you could set the camera's view matrix
manually in your frame loop before viewer.frame() so that the camera is
where you want it to be for your objects to be visible. It's your choice.
That's one of the nice things with OSG development... No black box. You
can see what everything does and how it's done, and most of the time
it's coded in a way that's understandable by mere mortals like us (as
opposed to some other libraries like boost :-) ).
Hope this helps,
J-S
--
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http://whitestar02.webhop.org/
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