[vtkusers] Help, please. vtkStreamingDemandDrivenPipeline Update extent error

[Marty Humperdink]

Hi all. 

I'm working on two separate projects using Tcl/Tk and VTK5.2 and have been stymied by the same error in each. I would be enormously appreciative if
anyone could provide some feedback. 

In one project I'm creating an empty image data set then using vtkStencil to create a voxelized version of a polydata model in it. 

In the other project I'm loading in some 3D ultrasound data in spherical coordinates, putting it into a vtkStructuredGrid, then trying to probe this
using a vtkImageData object in order to resample the unstructured grid into image data. 

In both projects I'm stuck getting an error that looks like this:
vtkStreamingDemandDrivenPipeline (061A8E28): The update extent specified 
in the information for output port 0 on algorithm ....
Unfortunately the error disappears from the vtkOutput window when Windows tosses up one of those 'VTK.exe had to close do you want to send a report' messages so 
I'm not sure what the entire message reads. I've been trying a wide range of things to work around this error but the fact that has come up in two separate projects
leads me to believe that I may not understand the pipeline correctly. In both cases I create an empty vtkImageData, so I've been focusing on this. I've wondered if 
I need to force and Update (or not), set extents differently or ...
If anyone is familiar with this error and could make suggestions (even if they are elementary) it would be a huge help. I've invested a lot of time into this and
am now far behind. 
Thank you very much
MH


      
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://www.vtk.org/pipermail/vtkusers/attachments/20090215/ae938abf/attachment.htm>