[Paraview] ParaView 3.98 contour filter "Compute scalars" misbehaves

[Andy Bauer]

Hi Russ,

Thanks for the input. I can replicate the problem with it being disabled
and will fix it. I noticed though that in both 3.14.1 and 3.98 that the
option to Compute Scalars was disabled/grayed out for polydata input.

I see what you mean about passing scalars. I think this issue has to do
with what's being set as the default scalars. The calculator filter sets
its output array as the scalar. You'll also notice that with your data set
that if you try and contour by Result2 or Tiff Scalars directly from the
reader you'll also get Result2 and Tiff Scalars out but not Result1. I only
checked with this on PV 3.98 though.

Do you mind adding in a mantis bug issue though?

Thanks,
Andy

On Fri, Jan 4, 2013 at 4:16 PM, Russell M. Taylor II <taylorr at cs.unc.edu>wrote:

> After loading a data file with more than one data set in it (for example,
> the VTK file stored in http://www.cs.unc.edu/~**
> taylorr/temp/Mcneil_CNTs.zip<http://www.cs.unc.edu/~taylorr/temp/Mcneil_CNTs.zip>),
> application of the contour filter does not allow me to click the "Compute
> Scalars" checkbox (it is grayed out).  If I compute a range of values
> (Delete All/New Range) and Contour by "Result1", it does not carry Result1
> into the output.  Therefore, I cannot color the contours by the value I
> used to generate them.
>
> Workaround shows another problem: If I use the Calculator on the original
> data set and make a Result1copy data set from Result1 and then Contour the
> output of the calculator by Result1, then it carries through Result1 and
> Result2 but not Result1copy.  I would have expected it to keep Result2 and
> Result1copy.  If I contour by Result1copy, it still carries through Result1
> and Result2.
>
> I'll add the workaround into my homework description for the class this
> semester, but it would be good if the checkbox was not grayed out so we
> could select the behavior that we usually want from this filter.  It used
> to work in an older version.
>
> Thanks,
> Russ
>
>
> ---
> Russell M. Taylor II, Ph.D.                           taylorr at cs.unc.edu
> CB #3175, Sitterson Hall                        www.cs.unc.edu/~taylorr
> University of North Carolina,                     Voice: (919) 962-1701
> Chapel Hill, NC 27599-3175                        FAX:   (919) 962-1799
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