[Paraview] RequestData Being Called Multiple Times [PV3.1.0]

[Mike Jackson]

Well, I worked it down to the following lines that appear in the  
RequestInformation() method:

#if 0
   outInfo->Set( vtkDataObject::ORIGIN(), DataOrigin, 3 );
   outInfo->Set( vtkDataObject::SPACING(), DataSpacing, 3 );
   this->DataExtent[0] = this->DataExtent[2] = this->DataExtent[4] = 0;
   this->DataExtent[1] = xDim;
   this->DataExtent[3] = yDim;
   this->DataExtent[5] = zDim;
   outInfo->Set( vtkStreamingDemandDrivenPipeline::WHOLE_EXTENT(),  
DataExtent, 6 );

   vtkDataObject::SetPointDataActiveScalarInfo(outInfo,  
VTK_TYPE_FLOAT32,1);
#endif

If I leave it so that code is compiled, then my RequestData is called  
multiple times. I looked at some other readers (ImageReader2) and it  
seems to be setting this ok, but I think that reader is based off the  
older pipeline..

-- 
Mike Jackson   Senior Research Engineer
Innovative Management & Technology Services


On Jul 17, 2007, at 3:02 PM, Kent Eschenberg wrote:

> Mike Jackson wrote:
>> RequestInformation is only being called once.... which I forgot to  
>> mention.. But I will check just to make sure.. .. Checking......  
>> Yep only once where the ModifiedTime is different from the top of  
>> the method to the bottom of the method.
>
> Hmmm ... maybe that is not the problem. But maybe I wasn't clear.  
> I'll try again.
>
> I suspect that the executive records the modified time before it  
> calls RequestInformation. Then, if RequestInformation calls those  
> macros you mentioned, and they in turn change the modified time,  
> then the modified time will be changed by the end of  
> RequestInformation and thus the end of RequestData. Hence the  
> subsequent re-call.
>
> Kent