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

[Cook, Rich]

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<mailto: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<mailto: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<mailto: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<mailto: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> [mailto:paraview-bounces at paraview.org<mailto:bounces at paraview.org>] On Behalf Of Cook, Rich
Sent: Monday, November 18, 2013 5:52 PM
To: paraview at paraview.org<mailto: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)



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