<div dir="ltr">Hey Bill,<div><br></div><div>The very short (and annoying) answer is that VTK does not currently support varying WHOLE_EXTENT().</div><div><br></div><div>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?</div><div><br></div><div>Best,</div><div>-berk</div></div><div class="gmail_extra"><br><div class="gmail_quote">On Wed, Dec 30, 2015 at 3:24 PM, Bill McGrory <span dir="ltr"><<a href="mailto:mcgrory@aerosoftinc.com" target="_blank">mcgrory@aerosoftinc.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"> I am having difficulty porting some code from VTK 5 to 6.<br>
<br>
I have a custom algorithm for creating a vtkStructuredGrid as the source for my pipeline, so my class inherits vtkStructuredGridAlgorithm<br>
<br>
my pipeline simply connects the vtkStructuredGridAlgorithm to a vtkGeometryFilter which is mapped with a vtkPolyDataMapper<br>
<br>
I want my source to correctly render a structured grid which changes dimensions dynamically within my application.<br>
<br>
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<br>
<br>
<br>
ERROR: In VTK-6.2.0/Common/ExecutionModel/vtkStreamingDemandDrivenPipeline.cxx, line 860<br>
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.<br>
(This is in VerifyOutputInformation) called before the RequestUpdateExtent for my algorithm.<br>
<br>
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<br>
<br>
in vtkGeometryFilter::RequestUpdateExtent<br>
<br>
then the error goes away.<br>
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.<br>
<br>
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?<br>
<br>
Thanks<br>
<br>
Bill<br>
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