thank you filip! this might just be what i was looking for :)
but i'm getting OpenGL errors here ...
Code:
Warning: detected OpenGL error 'invalid operation' at end of SceneView::draw()
Warning: detected OpenGL error 'invalid operation' at start of State::apply()
the letter one keeps piling up as the app runs.
i wrote this code into the main function just before calling the optimizer and
viewer.run();
Code:
osg::ref_ptr<osg::Group> rootNode = new osg::Group;
{
osg::Stencil* stencil = new osg::Stencil;
stencil->setFunction(osg::Stencil::ALWAYS, 1, ~0u);
stencil->setOperation(osg::Stencil::ZERO, osg::Stencil::ZERO,
osg::Stencil::REPLACE);
osg::StateSet* ssb1 = new osg::StateSet();
ssb1->setMode(GL_CULL_FACE, osg::StateAttribute::OFF);
ssb1->setAttributeAndModes(stencil, osg::StateAttribute::ON);
rootNode->setStateSet(ssb1);
}
rootNode->addChild(loadedModel.get());
viewer.getCamera()->setPostDrawCallback(new PostDrawCallback());
and then the callback
Code:
class PostDrawCallback : public osg::Camera::DrawCallback {
virtual void operator () (osg::RenderInfo& renderInfo) const {
osg::ref_ptr<osg::Image> img = new osg::Image;
osg::View *view = renderInfo.getView();
int width = view->getCamera()->getViewport()->width();
int height = view->getCamera()->getViewport()->height();
img->readPixels(0, 0, width, height, GL_STENCIL_INDEX,
GL_UNSIGNED_BYTE);
}
};
if i comment out the readpixels method, the errors do not apear.
what am i missing [Question]
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http://forum.openscenegraph.org/viewtopic.php?p=44186#44186
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