[osg-users] OpenGL error 'invalid enumerant' after RenderBin::draw(, )
Evan Sheffield
I've had some problems getting my OSG applications to render properly. I'm using Microsoft Visual C++ 2010 Express.
I've written a very simple application which should simply display a sphere. The code compiles, but when the viewer runs, the sphere doesn't appear and I get the message:
Warning: detected OpenGL error 'invalid enumerant' after RenderBin::draw(,)
I have no idea what this means or how to fix it. I was able to compile and run successfully on a Linux system, but I've had no luck with Windows and Visual C++. Can anybody help me out?
...
Thank you!
Cheers,
Evan
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Read this topic online here:
http://forum.openscenegraph.org/viewtopic.php?p=34950#34950
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Jean-Sébastien Guay
> I've written a very simple application which should simply display a sphere. The code compiles, but when the viewer runs, the sphere doesn't appear and I get the message:
> Warning: detected OpenGL error 'invalid enumerant' after RenderBin::draw(,)
>
> I have no idea what this means or how to fix it. I was able to compile and run successfully on a Linux system, but I've had no luck with Windows and Visual C++. Can anybody help me out?
We will not be able to help much if you don't show your code, because
what you describe is very simple and should work (at least as far as we
can see from your description). If we see the code we might be able to
tell you what's wrong.
Also, have you looked at the OSG examples and the Getting Started Guide
to make sure you're doing things right?
J-S
--
______________________________________________________
Jean-Sebastien Guay jean-seba...@cm-labs.com
http://www.cm-labs.com/
http://whitestar02.webhop.org/
Evan Sheffield
Skylark wrote:
> Hello Evan,
>
> We will not be able to help much if you don't show your code, because
> what you describe is very simple and should work (at least as far as we
> can see from your description). If we see the code we might be able to
> tell you what's wrong.
>
> Also, have you looked at the OSG examples and the Getting Started Guide
> to make sure you're doing things right?
>
> J-S
> --
> Post generated by Mail2Forum
Hello,
Yes, I followed the startup guide to get OSG working on my computer. This is the simple code that I was trying:
Code:
#include <osg/Group>
#include <osg/LightSource>
#include <osg/ShapeDrawable>
#include <osgViewer/Viewer>
using namespace osg;
// main function
int main()
{
// create the root node of the scene graph
ref_ptr<Group> root = new Group;
// create a node to the geometry of a spherical object
ref_ptr<Geode> ballNode = new Geode;
ballNode->addDrawable(new ShapeDrawable(new Sphere));
// create a "distant" light, with 0 for the homogeneous coord
Vec4 lightDirection(1, -1, 1, 0);
ref_ptr<LightSource> ls = new LightSource;
ls->getLight()->setPosition(lightDirection);
// set the intensity properties for the light
ls->getLight()->setAmbient(Vec4(0.2, 0.2, 0.2, 1.0));
ls->getLight()->setDiffuse(Vec4(1.0, 1.0, 0.7, 1.0));
ls->getLight()->setSpecular(Vec4(1.0, 0, 0, 1.0));
// assemble the node hierarchy
root->addChild(ls.get());
root->addChild(ballNode.get());
// create the viewer helper object
osgViewer::Viewer viewer;
viewer.setSceneData(root.get());
viewer.realize();
while( !viewer.done() )
{
viewer.frame();
}
return 0;
}
Thanks in advance for your help.
~Evan
------------------
Read this topic online here:
http://forum.openscenegraph.org/viewtopic.php?p=35003#35003
Jean-Sébastien Guay
The default viewer camera position is at (0,0,0), which turns out to be
inside your sphere. So you just see the inside of your sphere (not a
very interesting view point to be sure! :-) ).
You have used the while(!viewer.done()) viewer.frame() method of coding
the main loop, and so no camera manipulator is created automatically by
the viewer, and you don't add any camera manipulator yourself, so you
will need to set the viewer camera's view matrix yourself to be able to
see the object.
Add viewer.getCamera()->setViewMatrixAsLookAt(osg::Vec3(0,-10,0),
osg::Vec3(0,0,0), osg::Vec3(0,0,1)); just before your frame loop to see
the object. You can also call this method at different times inside the
frame loop (or in callbacks) if you want to animate the camera's position.
You could also opt to add a camera manipulator, then you would add
viewer.setCameraManipulator(new osgGA::TrackballManipulator); before
your frame loop, for example. The camera manipulator will center on your
scene's bounds on the first frame, so you will see the whole scene and
will be able to move/rotate the camera around.
With either of these changes I can see the sphere just fine (and with
the correct yellowish lighting as you've set in your light source's
diffuse light color). Of course without a camera manipulator you won't
be able to rotate the camera with the mouse (unless you code that
yourself in an event handler that sets the camera's view matrix, for
example).
As for your OpenGL messages, I don't get any of those when running your
code. They could be related to your driver. These messages are sometimes
false positives, meaning they may be shown even if nothing is wrong. I
would recommend checking if there is an updated driver for your video
card and see if they go away.
Hope this helps,
J-S
--
______________________________________________________
Jean-Sebastien Guay jean-seba...@cm-labs.com
http://www.cm-labs.com/
http://whitestar02.webhop.org/