[vtk-developers] UPDATE_EXTENT not updating after change to WHOLE_EXTENT

[Berk Geveci]

Hey Bill,

The very short (and annoying) answer is that VTK does not currently support
varying WHOLE_EXTENT().

However, there are ways of getting around this. But before I get into
those, can you describe how/where you change the whole extent? As part of a
time update? By setting some data member on the reader?

Best,
-berk

On Wed, Dec 30, 2015 at 3:24 PM, Bill McGrory <mcgrory at aerosoftinc.com>
wrote:

>  I am having difficulty porting some code from VTK 5 to 6.
>
> I have a custom algorithm for creating  a vtkStructuredGrid as the source
> for my pipeline, so my class inherits vtkStructuredGridAlgorithm
>
> my pipeline simply connects the vtkStructuredGridAlgorithm to a
> vtkGeometryFilter which is mapped with a vtkPolyDataMapper
>
> I want my source to correctly render a structured grid which changes
> dimensions dynamically within my application.
>
> My problem is that  if I originally set up the grid with say extents of 0
> --99, 0-->99,  0-->99, and then change the extents to 0--49, 0-49,0-49
> through a call to Update, then I get a VTK error message from
>
>
> ERROR: In
> VTK-6.2.0/Common/ExecutionModel/vtkStreamingDemandDrivenPipeline.cxx, line
> 860
> vtkCompositeDataPipeline (0xb4561f0): The update extent specified in the
> information for output port 0 on algorithm SurfaceSNodeSource(0xb455750) is
> 0 80 0 32 0 0, which is outside the whole extent 0 40 0 16 0 0.
> (This is in VerifyOutputInformation) called before the RequestUpdateExtent
> for my algorithm.
>
> I don't quite understand the propagation of the UPDATE_EXTENT information
> up the pipeline, but if I set the UPDATE_EXTENT to WHOLE_EXTENT
>
> in vtkGeometryFilter::RequestUpdateExtent
>
> then the error goes away.
> Also, at the time of calling vtkGeometryFilter::RequestUpdateExtent, the
> UPDATE_EXTENT is still set at the old value, while the WHOLE_EXTENT has
> been correctly updated/propagated from upstream.
>
> Is this a bug, or do I need to change something in my
> vtkStructuredGridAlgorithm to cause the UPDATE_EXTENT to be reset at the
> origin downstream?
>
> Thanks
>
> Bill
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