tf that has stopped publishing still can be found by lookupTransform
Hi guys,
My problem is that lookupTransform function can still get the transformation and rotation of a frame that has stopped publishing already (I tried tf_echo and tf_monitor and it is not there.)
What I am doing is that I use Kinect and openni_tracker to get the skeleton, then use a frame from the skeleton to set up another frame relative to the world frame. However, when the human is not present in the Kinect view anymore, the skeleton's frames are still in the list got from listener.getFrameStrings(). Anyway, my broadcaster.sendTransform(...) is not called, as far as I have checked, so my frame is not published. (tf_monitor also shows that it is not there.)
But, another node that is waiting for this frame can still get translation and rotation from lookupTransform function, which is not what I want.
Any possible causes? Thank you.
