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

[Berk Geveci]

So when the WHOLE_EXTENT() changes, you tell the source/reader by modifying
it somehow? What I am trying to get to is whether or not this works:

someSource->SetNewData();
someSource->Modified()
someFilterDownstream->Update();

someSource->SetNewData();
someSource->Modified()
someFilterDownstream->Update();

I believe that as long as the source is modified after the WHOLE_EXTENT()
changes, update should work fine. Because this would lead to
RequestInformation() being called again, which is what propagates the new
WHOLE_EXTENT() downstream.

Best,
-berk

On Mon, Jan 4, 2016 at 11:39 AM, Bill McGrory <mcgrory at aerosoftinc.com>
wrote:

> I  have a pipeline for displaying structured zones within a GUI. These
> zone's have multiple grid refinement levels or sequences. The beginning of
> the pipeline is a source which creates a vtkStructuredGrid.
>
> When I interactively change the sequence level the source gets a call to
> update the pipeline where I need to change the vtkStructuredGrid to
> represent a different sequence level (so my grid grid dimensions will
> double or halve, for example)
>
> This process worked (by accident perhaps) in versions of VTK prior to 6.
>
> Thanks
> Bill
>
>
>
> On 01/04/2016 11:08 AM, Berk Geveci wrote:
>
> 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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>
> --
> Dr. William D. McGrory    AeroSoft, Inc.mcgrory at aerosoftinc.com   Suite 1400(540) 557-1904            2000 Kraft Drive(540) 557-1919 (FAX)      Blacksburg, VA 24060
>
>
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