[vtk-developers] RE: Problem when creating vtkImageData by hand
Will Schroeder
will.schroeder at kitware.com
Fri Aug 19 10:31:43 EDT 2005
Prabhu-
I wanted to update you on this test. It has uncovered some issues in
the pipeline and we are evaluating options for a fix. In the mean
time, we have made a one-line fix that avoids cloning the output of
the reader to create the image data. I know this is not what is
intended, but we are trying to clear the dashboard while we resolve
the issue...we have entered a bug in the tracker.
Will
At 10:35 AM 8/18/2005, you wrote:
> >>>>> "Brad" == Brad King <brad.king at kitware.com> writes:
>
> Brad> Prabhu Ramachandran wrote:
> >>>>>>> "Dean" == Dean Inglis <dean.inglis at camris.ca> writes:
> >>
> Dean> and removed the outline filter from the pipeline and
> Dean> everything runs fine. As soon as I add the outline filter,
> Dean> I get the same weird results. I haven't figured out if this
> Dean> is a pipeline problem, IPW problem or outline filter
> Dean> pb.... :{
> >>
> >> Thanks for the confirmation of the problem! This means there
> >> is a nasty bug lurking somewhere in there.
>
> Brad> I've found the problem. The vtkOutlineFilter derives from
> Brad> vtkPolyDataAlgorithm.
> Brad> vtkPolyDataAlgorithm::RequestUpdateExtent sets
> Brad> RequestExactExtent to 1 so that it requests the exact
> Brad> unstructured extent. However when the input of
>[...]
> Brad> Since vtkTrivialProducer has only one copy of the data it
> Brad> will never actually generate or re-initialize its output.
> Brad> However when RequestExactExtent is on then the executive
> Brad> crops the data and it is lost forever!
>
>I don't understand this. Shouldn't this work because the pipeline is
>"branched" in the sense that the resliced output is used by one actor
>and the original (intact) data is used by the outline filter. Why
>should the cropping propagate upstream at all and affect all branches
>of the pipeline?
>
>cheers,
>prabhu
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