[vtkusers] update extent error

[Dominik Szczerba]

I found a way to get rid of this error at least in my case: after
experimentally trying out things around, it turned out that a reason is
calling Update() after each chain in the pipeline. When connecting
things via SetInput(GetOutput()) it was always fine, but here with
SetInputConnection(GetOutputPort()) if I call Update() each time I get
this error. If I dont call any Update()'s all is clean. Strange.

Is this normal? Calling Update() on an up-to-date object should do
nothing, no? Furthermore: how do I now debug my pipeline: suppose I want
to see the number of points in an output somewhere in the middle of the
pipeline: unless I call Update() it is not available... and if I do I
get an error. Feature? Unclean design? Bug?

-- Dominik

On Wed, 2009-07-08 at 15:21 +0200, Dominik Szczerba wrote:
> Many thanks for feedback. Unfortunately, Neither of the methods
> (UpdateDisplayExtent() or UpdateDisplayExtent) applies for my pipeline
> (extractVOI, calculator, gaussian, threshold, polydata actors)... Any
> other ideas?
> 
> I would at least like to know if this is a bug or not. The thread on it
> on the developers list was cut.
> 
> regards,
> Dominik
> 
> On Wed, 2009-07-08 at 14:38 +0200, Julien Lamy wrote:
> > Dominik Szczerba a écrit :
> > > I get this error after updating the extents of the source to my filter
> > > only iff the new extents are smaller:
> > > 
> > > ERROR:
> > > In /home/domel/pack/vtk-5.4.0/Filtering/vtkStreamingDemandDrivenPipeline.cxx, line 818
> > > vtkStreamingDemandDrivenPipeline (0x8fd69b8): The update extent
> > > specified in the information for output port 0 on algorithm
> > > vtkImageGaussianSmooth(0x8fd5b70) is 70 317 112 264 96 159, which is
> > > outside the whole extent 72 315 114 262 98 157.
> > > 
> > > I see issue this raised several times on both vtkusers and vtkdevelopers
> > > but never resolved.
> > > 
> > > It "normally" does not break the pipeline execution, but my critical
> > > problem is I have an observer following vtkCommand::ErrorEvent that has
> > > to quit the application.
> > > 
> > > How do I clean this error?
> > 
> > Hi Dominik,
> > I had a similar problem with a vtkImageActor : if the size of its input 
> > changes, then the display extent of the actor must be explicitely 
> > specified to reflect the new input size. There is a message on vtkusers 
> > [1] which hints at this, but I could not find a better solution.
> > 
> > [1] http://www.vtk.org/pipermail/vtkusers/2005-November/082422.html
> > 
> > HTH,