[vtkusers] vtkStreamingDemandDrivenPipeline ques

[Dean Inglis]

prior to all the pipeline re-work,
I could load 3D image data with a vtkImageReader
with ReleaseDataFlagOff.  I added some
callbacks to show read progression in a
GUI progress bar.  The reader output was passed
onto a vtkOutlineFilter, 3 vtkImagePlaneWidgets
and a vtkImageActor for one of the widget's
outputs for 2D display.

Now I am getting errors:

ERROR: In C:\Builder\Sources\VTK\Filtering\vtkExecutive.cxx, line 701
vtkStreamingDemandDrivenPipeline (091AE708): ProcessRequest invoked during
another request.  Returning failure to algorithm vtkImageReader(091AA25C).

and interaction with the widget apparently causes
the reader to re-read its data from disc
since the progress meter is activated.

Any thoughts?

Dean