[Paraview] custom filter?

[Dominik Szczerba]

Thanks for the detailed explanation.

This does not seem ti work for transient datasets (it does the job for a given 
timestep only).
In addition, display properties can not be stored (opacity, active color 
scalars etc).
Or did I overlook something? Or do I need a more recent CVS? (mine is early 
August)

Thanks a lot,
Dominik


On Thursday 04 September 2008 03:35:54 pm Utkarsh Ayachit wrote:
> Custom filter mechanism is designed to be used to combine a sub-pipeline
> into a single filter (or source) (with all the a paramter settings for
> each of the individual filters/sources) exposing a subset of the
> parameters to the user.
>
> Eg. Here's my pipeline:
> Sphere -> Shrink --> "Extract Edges"
>
> Suppose we want to combine the Shrink-->ExtractEdges into a new custom
> filter "ShrunkEdges".
>
> * Select the Shrink and the Extract Edges filter in the pipeline browser
> (use Ctrl key for multiple selections).
> * With the two filters selected, go to Tools menu and choose "Create
> Custom Filter"
> * The "Create Custom Filter" wizard will show up.
> * First give our filter a new name. This name must be unique and if
> conflicting an error message will be shown. We are calling this one
> "ShrunkEdges" (step1.png). Then click "Next".
> * We now choose what are the inputs to the custom filter that the user
> can set. By default, paraView will find the first filter in the
> sub-pipeline (in this case "Shrink") and expose it's "Input" property as
> the input to this custom filter. Since that's exactly what we want here
> (step2.png), click "Next".
> * Next we need to choose the outputs from this filter. By default,
> paraview will choose the last filter in the subpipeline (in this case
> 'ExtractEdges'. Let's say we want this custom filter to have two
> outputs, the output after the shrink stage as well as the one after
> extracting edges. ExtractEdges is already exposed as an output, we now
> expose the shrink filter as well. Select the "Shrink" in the left-side
> tree. It's output ports will be shown the "Output Port" combo. Choose
> the output port (relevant if the filter itself had more than 1 output
> ports), the assign it some unique name, say "ShrunkOutput" then press
> "+" to add it to the exposed outputs list (step3.png).  Click "Next".
> * Next we expose the subset of parameters on this custom filter that the
> user can change at run-time. Let's say we want to allow the user to
> change the "Shrink Factor" on the shrink filter. Select the "Shrink"
> filter in the tree and then select the property to expose in the
> "Property" combo, assign it some name (or use the default) and the hit
> "+" to expose it (step4.png). Once all required properties are exposed,
> click "Finish" to create a definition for the custom filter.
>
> The "Custom Filter Manager" will popup showing the newly defined custom
> filter. The manager is also available under the "Tools" menu. It can be
> used to remove/export/import custom filters.
>
> Close this dialog.
>
> Now to instantiate our new custom filter, simply look under the
> "Filters|Alphabetical" menu, we see our new "ShrunkEdges" filter. Now
> you can create it simply as if it were a normal filter.
>
> Same is true with sources, if no input property is exposed, it's treated
> as a source and is available under "Sources" menu.
>
> Utkarsh
>
> Dominik Szczerba wrote:
> > I have a complicated layout of filters on the left panel. How do I go
> > about saving them as a filter in PV CVS? (saving state does not work for
> > transient, fixing number current time steps). I tried 'create a custom
> > filter' but it is not comprehensive. I clicked around and ended up
> > nowhere. Any hints are appreciated.
> > PS. I dd not find anything on wiki, and can again no longer find a search
> > link to ML archives.
> >
> > best regards



-- 
Dominik Szczerba, Ph.D.
Computational Physics Group
Foundation for Research on Information Technologies in Society
http://www.itis.ethz.ch