[vtkusers] vtkStreamingDemandDrivenPipeline ques

[Brad King]

Dean Inglis wrote:
> Hi Brad,
> 
> thanks for the additional info that the executive now provides (see below).
> Can you provide or point me to some relevant up-to-date documentation
> on the  new pipeline architecture that would help interpret the
> error messages?

No official document has yet been completed.  Look in vtkExecutive.h at 
the documentation of the CheckAlgorithm method.

> ERROR: In C:\Builder\Sources\VTK\Filtering\vtkExecutive.cxx, line 715
> vtkStreamingDemandDrivenPipeline (091AED5C): UpdateInformation invoked
> during another request.  Returning failure to algorithm
> vtkImageReader(091AA55C).
> 
> 
> ERROR: In C:\Builder\Sources\VTK\Filtering\vtkExecutive.cxx, line 708
> vtkStreamingDemandDrivenPipeline (091AED5C): ProcessRequest invoked during
> another request.  Returning failure to algorithm vtkImageReader(091AA55C)
> for the recursive request:
> vtkInformation (0BAF4434)
>   Debug: Off
>   Modified Time: 125461
>   Reference Count: 1
>   Registered Events: (none)
>   Request: REQUEST_DATA_OBJECT
>   ALGORITHM_AFTER_FORWARD: 1
>   FROM_OUTPUT_PORT: 0
>   FORWARD_DIRECTION: 0

This means something is trying to update the pipeline recursively during 
another update.  Just put a breakpoint on the ErrorMacro line and step 
up in your debugger to see what is causing the update.  Alot of the 
cases I've seen when this happens were buggy multiple updates of the old 
pipeline that were not diagnosed.

-Brad