[vtkusers] Indicate renderer status

[Peter von Niederhaeusern]

Dear all,

In a recent post ("Force updates (vtkTextActor, QVTKWidget)", 06
September 2010) I asked this mailing list
about some hints on how to properly render text on a QVTKWidget for
the actual render status.

Unfortunately I got no response.

In the same context I tried myself to implement some kind of event
queue to receive notifications when
the VTK renderer is ready (has rendered a large volume and therefore
increased the level of detail again)
and accepts user inputs via the Qt GUI (to rotate/zoom etc.), and set
some status message.

My solution, however, is a bit clunky and does not always catch each
event pattern correctly.

Is there a simple way to have an indication on when the level of
detail changed from low to high
(or, in other words, when the renderer has finished)?

Thank you for a hint & best regards
Peter