[Paraview] Concept: A world without the Apply button

[Utkarsh Ayachit]

Dave,

Output types become a problem only for composite-datasets, for others
data-types are known after RequestDataObject pass which happens before
RequestData(). I am still not sure how (or if) to deal with composite
datasets in this case. We can expect the reader to give meta-data for
composite datasets and leaves in  the dataset in more details as well,
but I am not sure we need to yet.

As far as the scalars/vectors/tensors go, no filter in paraview
requires active-scalars/tensors etc, it just checks for existence of
array with a give number of components. The meta-data should indeed
contain information about arrays and number of components.

Utkarsh

On Wed, Jun 1, 2011 at 4:09 PM, David Thompson <dcthomp at sandia.gov> wrote:
>> I like the idea. One possible problem that comes to mind is filters that
>> produce different output types based on the input. Will enough of the
>> metadata be passed through the pipeline before Execute() is called for those
>> filters to hint at their output type? Otherwise, you'll be forced to hit
>> Execute before adding any more filters.
>
> Or, for that matter, what about filters which are disabled in the menu when
> there is no scalar/vector/tensor data on their input?
>
>        David
>
>> On Jun 1, 2011, at 12:30 , Utkarsh Ayachit wrote:
>>
>>> Folks,
>>>
>>> I have been investigating the ability to create pipelines in ParaView
>>> without having to hit Apply at every single stage in the pipeline.
>>> This would make it much easier to deal with really large data in a
>>> usage scenario where the scientist is fairly familiar with the
>>> visualization pipeline he's interested in setting up.
>>>
>>> Following the recent changes to the ParaView ServerManager, the
>>> ServerManager level requirement that filters need to be updated before
>>> connecting has disappeared. However, we still need to "Apply" to get
>>> updated information about arrays etc.
>>>
>>> After a couple on discussions with Berk and Dave, I've consolidated
>>> the thoughts on a Wiki page. If any one has any thoughts to share, it
>>> would be great.
>>>
>>>
>>> http://www.paraview.org/ParaView3/index.php/No-Apply_Mechanism_for_Creating_Pipelines
>>>
>>> Note that this is merely a concept. We have no plans of implementing
>>> it in near future (3.12/4.0).
>>>
>>> Utkarsh
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>>
>
>
>