[Paraview] [EXT] Re: Customize programmable filters: copy arrays

[Dennis Conklin]

Berk,

I generally want to add some new variables to the output – if I don’t DeepCopy, then these new variables get added to the input which violates the vtk rule that a filter can’t change the input.

This is the main reason that I advocate adding the capability for PointData and CellData to be partially DeepCopy (new variables added in Filter)  and partially ShallowCopy (input variables just along for the ride).

I suspect most filters are going to generate new variables, so DeepCopy seems to be appropriate.     Please correct me if I misunderstand this.

Dennis

From: Berk Geveci [mailto:berk.geveci at kitware.com]
Sent: Tuesday, November 10, 2015 3:40 PM
To: Dennis Conklin <dennis_conklin at goodyear.com>
Cc: Paraview (paraview at paraview.org) <paraview at paraview.org>
Subject: [EXT] Re: [Paraview] Customize programmable filters: copy arrays

Don't use DeepCopy() unless you intend to change the values of the output arrays. Use ShallowCopy() instead. You don't need CopyStructure() by the way. Alternatively, you can use PassData(). Something like this:

output.GetPointData().PassData(inputs[0].GetPointData())
output.GeCellData().PassData(inputs[0].GetCellData())


Best,
-berk

On Tue, Nov 10, 2015 at 1:49 PM, Dennis Conklin <dennis_conklin at goodyear.com<mailto:dennis_conklin at goodyear.com>> wrote:
Jean-Michel,

I normally just add the following two statements within my Filter:

output.CopyStructure(inputs[0].VTKObject)
output.DeepCopy(inputs[0].VTKObject)

Dennis

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