[Paraview] [EXTERNAL] why when contouring by density does a color plot of density show more than one color?

[David E DeMarle]

No need to click advanced, it is the Compute Scalars control you want.

David E DeMarle
Kitware, Inc.
R&D Engineer
21 Corporate Drive
Clifton Park, NY 12065-8662
Phone: 518-881-4909


On Tue, Nov 19, 2013 at 1:20 PM, David E DeMarle
<dave.demarle at kitware.com>wrote:

> Check on the advanced properties. Pass through scalars used to be an
> option.
> On Nov 19, 2013 10:26 AM, "Cook, Rich" <cook47 at llnl.gov> wrote:
>
>>  I disagree -- it seems to me that it would be very good to have the
>> correct color applied to the isosurface using the color map for the
>> variable being used.  This can provide information in a scene that is
>> relevant and important.  Having to manually choose a "constant color" does
>> not make sense to me.  Should it be purple?  Grey?  Arbitrary and
>> misleading.
>> -- Rich
>>
>>  On Nov 19, 2013, at 8:07 AM, "Scott, W Alan" <wascott at sandia.gov>
>>  wrote:
>>
>>   Ken/Rich,
>>  This is actually expected behavior that I have noticed before.  If we
>> contoured on a variable, that variable is now a constant for this surface.
>> Thus, it is useless.  I don’t know if we still should pass it on, but we
>> don’t.
>>
>>  Alan
>>
>>   *From:* Moreland, Kenneth
>> *Sent:* Monday, November 18, 2013 6:40 PM
>> *To:* Cook, Rich
>> *Cc:* Scott, W Alan; paraview at paraview.org
>> *Subject:* Re: [Paraview] [EXTERNAL] why when contouring by density does
>> a color plot of density show more than one color?
>>
>>  I believe Alan is right. The cell to point operation performs something
>> of a low pass filtering of the data, meaning that extrema get smoothed out.
>> It is entirely possible that is happening here.
>>
>>   It is strange that you cannot color by the point density. I would
>> expect that to be output by the filter.
>>
>>  -Ken
>>
>>  Sent from my iPad so blame autocorrect.
>>
>>
>> On Nov 18, 2013, at 6:03 PM, "Cook, Rich" <cook47 at llnl.gov> wrote:
>>
>>  I did notice that.  It does not allow me to color by point density.  I
>> don't think the values really vary by that much near the isosurface, but I
>> might be wrong.
>>
>>
>>   On Nov 18, 2013, at 4:58 PM, "Scott, W Alan" <wascott at sandia.gov>
>> wrote:
>>
>>
>>   Rich,
>>   The vast majority of the ParaView team is crazy busy at SC.  I.e. if
>> you don’t get an answer by next week, ping again.
>>
>>   OK, thinking out loud here – you are contouring by the density at the
>> points (nodes), but coloring by a subtly different variable – density at
>> the cells (elements).  Since you should have it available (coming out of
>> the cell to point filter), how about coloring by point density?  (You can
>> tell by the cute cube in front of the density variable – points look like
>> ... um ... points.)  That’s the only thing I can think of...
>>
>>   Alan
>>
>>    *From:* paraview-bounces at paraview.org [mailto:paraview-
>> bounces at paraview.org] *On Behalf Of *Cook, Rich
>> *Sent:* Monday, November 18, 2013 5:52 PM
>> *To:* paraview at paraview.org
>> *Subject:* [EXTERNAL] [Paraview] why when contouring by density does a
>> color plot of density show more than one color?
>>
>>   the attached is an image I made by creating a contour of the density
>> variable resulting from the CellDatatoPointData filter on some Miranda
>> data.  I colored by density.  Shouldn't it all be one color?
>>
>>   <image001.jpg>
>>    --
>>    ✐Richard Cook
>>    ✇ Lawrence Livermore National Laboratory
>>    Bldg-453 Rm-4024, Mail Stop L-557
>>    7000 East Avenue,  Livermore, CA, 94550, USA
>>    ☎ (office) (925) 423-9605
>>    ☎ (fax) (925) 423-6961
>>    ---
>>    Information Management & Graphics Grp., Services & Development Div.,
>> Integrated Computing & Communications Dept.
>>    (opinions expressed herein are mine and not those of LLNL)
>>
>>
>>
>>
>>
>>   --
>>   ✐Richard Cook
>>   ✇ Lawrence Livermore National Laboratory
>>   Bldg-453 Rm-4024, Mail Stop L-557
>>   7000 East Avenue,  Livermore, CA, 94550, USA
>>   ☎ (office) (925) 423-9605
>>   ☎ (fax) (925) 423-6961
>>   ---
>>   Information Management & Graphics Grp., Services & Development Div.,
>> Integrated Computing & Communications Dept.
>>   (opinions expressed herein are mine and not those of LLNL)
>>
>>
>>
>>
>>
>>  _______________________________________________
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>>
>>  --
>> ✐Richard Cook
>> ✇ Lawrence Livermore National Laboratory
>> Bldg-453 Rm-4024, Mail Stop L-557
>> 7000 East Avenue,  Livermore, CA, 94550, USA
>> ☎ (office) (925) 423-9605
>> ☎ (fax) (925) 423-6961
>> ---
>> Information Management & Graphics Grp., Services & Development Div.,
>> Integrated Computing & Communications Dept.
>> (opinions expressed herein are mine and not those of LLNL)
>>
>>
>>
>>
>> _______________________________________________
>> Powered by www.kitware.com
>>
>> Visit other Kitware open-source projects at
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