[osg-submissions] osg::Object::clone

[Валерий]

Hi, Robert!

I suggest to you to override type of returning value in realizations of
functions osg::Object::clone and osg::Object::cloneType in derived
classes. In this case one will be able to write simply "osg::Transform*
sTrans = sExistentTrans->clone();" instead of "osg::Transform* sTrans =
dynamic_cast<osg::Transform*>(sExistentTrans->clone());".

It is very simple to realize such behavior, three changed files are
attached in archive, changes are based on revision 8416.

Best regards,
Valery
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