[Paraview] default behavior change for contour filter

[Andy Bauer]

The input doesn't have to be a polydata and usually won't be a polydata so
it won't have normals already computed. if compute scalars is on then all
the arrays are passed from the input to the output but if compute scalars
is off then all but the array selected for contouring will be passed to the
output.

On Wed, Aug 15, 2012 at 1:37 PM, Aashish Chaudhary <
aashish.chaudhary at kitware.com> wrote:

> May be it is obvious, but why we don't compute normal's for
> vtkPolyData in the first place? If the input has normal's array, then
> I would assume that output should have normal's by default.
>
>
> On Wed, Aug 15, 2012 at 12:01 PM, Andy Bauer <andy.bauer at kitware.com>
> wrote:
> > I'd like to change ParaView's default behavior of the contour filter.
> > Currently the default is to compute normals and not compute gradients or
> > scalars. These defaults are only used for structured data sets (i.e.
> > vtkStructuredGrid, vtkImageData, and vtkRectilinearGrid) and are not
> options
> > when isosurfacing for vtkPolyData or vtkUnstructuredGrids. When the input
> > data set is a multiblock data set that contains both structured and
> > unstructured data sets the output for the current code results in a
> > multiblock data set with partial arrays (Normals for the structured data
> > sets and the contoured variable for the unstructured data sets). The
> change
> > I'd like to make is to make Compute Normals off by default and Compute
> > Scalars on by default so that the output is a bit more consistent.
> >
> > Does anyone think that this is a significant change and shouldn't be
> done?
> >
> > Thanks,
> > Andy
> >
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>
>
> --
> | Aashish Chaudhary
> | R&D Engineer
> | Kitware Inc.
> | www.kitware.com
>
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