//-----------------------------------------------------------------------
 void RenderSystem::_notifyCameraRemoved(const Camera* cam)
 {
     RenderTargetMap::iterator i, iend;
     iend = mRenderTargets.end();
     for (i = mRenderTargets.begin(); i != iend; ++i)
     {
         RenderTarget* target = i->second;
         target->_notifyCameraRemoved(cam);
     }
 }