Hi there,
i find that there is a setPostDrawCallback function, However, how could i
remove that PostDrawCallback after it was used.
currently, i use a composite factory to resolve this problem that i write a
class CameraPostDrawCallback which is derived from Camera::DrawCallback and in
fact is a composite DrawCallback which keep a list of real DrawCallback
pointers. I setup this CameraPostDrawCallback to the Camera when program
starting up, and leave it there forever. when ever i want to use a
DrawCallback, a object is defined and is appended to CameraPostDrawCallback,
so that it has chance to be executed, after it was used, it will be removed.
key code snippet:
void operator()(const Camera& camera){
while(mCallbackList.size()>0){
Camera::DrawCallback* callback=mCallbackList.takeFirst();
mCallbackList.pop_front();
try{
(*callback)(camera);
}catch(...){}
mBackupList.push_back(callback);
}
mCallbackList.append(mBackupList);
mBackupList.clear();
}
It works well now. However I doubt it is erroneous way to use DrawCallback that
those nested DrawCallback do not have chance to be touched by Osg Core sot that
can't be initialized correctly.
So, am i working in a correct way? if no ,then how do i remove a
PostDrawCallback?
I do have tried to set a NULL to the camera, it is breaked after leaving my
function.
Regards,
Abe. Zhu_______________________________________________
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