Hi!
I have a cameraNode and i need to take a screenshot. I see that the
producer camera implements a postDrawcallback to take the screenshot.
I copy this code for my cameranode (yes, i have a osg::CameraNode
camera) and it doesn't works. I debug it and never calls the
operator(). Someone can i help me???
this is my drawcallback class...
class SnapImageDrawCallback : public osg::CameraNode::DrawCallback
{
public:
SnapImageDrawCallback():
_snapImageOnNextFrame(false)
{
}
void setFileName(const std::string& filename) { _filename = filename; }
const std::string& getFileName() const { return
_filename; }
void setSnapImageOnNextFrame(bool flag) { _snapImageOnNextFrame = flag;
}
bool getSnapImageOnNextFrame() const { return _snapImageOnNextFrame; }
virtual void operator () (const osg::CameraNode& camera) const
{
if (!_snapImageOnNextFrame) return;
int x,y,width,height;
camera.getViewport()->getViewport(x,y,width,height);
osg::ref_ptr<osg::Image> image = new osg::Image;
image->readPixels(x,y,width,height,GL_RGB,GL_UNSIGNED_BYTE);
if (osgDB::writeImageFile(*image,_filename))
{
osg::notify(osg::NOTICE) << "Saved screen image to
`"<<_filename<<"`"<< std::endl;
}
_snapImageOnNextFrame = false;
}
protected:
std::string _filename;
bool _snapImageOnNextFrame;
};
and then asign the callback to my cameranode:
SnapImageDrawCallback* snapImageDrawCallback = new SnapImageDrawCallback();
sceneView->getCamera()->setPostDrawCallback(snapImageDrawCallback);
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