[Paraview] What part of the pipeline is producing the request
eschenbe at psc.edu
Wed Feb 13 10:17:35 EST 2008
Indeed, each of the my routines to set the VOI bounds (one each for the min/max
in X/Y/Z) calls Modified().
During development I had temporary print statements everywhere and as I
remember it these routines to set the VOI were called both before and after
Pittsburgh Supercomputing Center
Moreland, Kenneth wrote:
> I belive it is supposed to work that your SetVOI() method should call
> modified, which will in turn cause the pipeline to call
> RequestInformation() on the next update. Make sure that SetVOI() is
> actually calling Modified().
> On 2/12/08 9:26 PM, "Mike Jackson" <imikejackson at gmail.com> wrote:
> Pretty sure that was where we were going to end up BUT as far as I
> can tell, the order of execution is :
> SetVOI() // From the GUI in ParaView
> So we never really get a chance to get the VOI until RequestData
> fires.. Is that what you have seen?
> On Feb 12, 2008, at 11:21 PM, Kent Eschenberg wrote:
> > Mike,
> > I accomplished what you want with one of our custom readers. In my
> > opinion the documentation for RequestInformation, RequestData,
> > extents, etc. is so poor that it is useless.
> > At RequestInformation I read enough of the input to get the overall
> > input array size; apply the user-selected VOI; and return the
> > desired subset as the whole extent. At RequestData I read the rest.
> > I just don't bother letting VTK/ParaView manage the selection of
> > the VOI. This has worked for 2.6.1 through 3.2.1.
> > Kent
> > Pittsburgh Supercomputing Center
> > Mike Jackson wrote:
> > > I can do that but I don't think it will work.
> > > In paraview, I have managed to set an auto-generated UI for the
> > > VOI. Now, the user opens our file, RequestInformation is run (I
> > > can put some sane defaults for the VOI) and things are ok so far.
> > > Now the user clicks "Apply" and then SetVOI is called with the
> > > values from the GUI and then RequestData() is called after that.
> > > So where do I update WHOLE_EXTENT? Or just take the values from
> > > the VOI, create a vtkImageObject from that, and then just
> > > ShallowCopy to the output object?
> > > I'm a bit confused at this point. If our case is NOT a standard
> > > use case for the pipeline than I guess I can look more seriously
> > > into developing a full blown Plugin for our data file.
> > > Mike
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