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IDProjectCategoryView StatusDate SubmittedLast Update
0011211ParaViewBugpublic2010-09-07 04:232010-12-07 17:29
Reporterthorenz 
Assigned ToRobert Maynard 
PrioritynormalSeveritymajorReproducibilityalways
StatusclosedResolutionfixed 
PlatformOSOS Version
Product VersionDevelopment 
Target VersionFixed in Version3.10 
Summary0011211: ParaView-3.9.0 gives wrong contour (iso-surface) on OpenFOAM-datasets
DescriptionWhen reading an OpenFOAM-dataset, the contour filter (iso-surface would be a better name :) doesn't work correctly.

In the applied file "openfoam_surface.jpg" you see the variable "alpha1" plotted on the surface. The contour filter for alpha1=0.5 should extract a surface between red and blue areas. Instead a strange surface is generated which covers many cells (openfoam_contour.jpg) but which is not the iso-surface.
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Attached Fileszip file icon pics.zip [^] (88,714 bytes) 2010-09-07 04:23
png file icon arraySelectionScreenshot.png [^] (23,153 bytes) 2010-09-27 06:08

 Relationships

  Notes
(0022175)
thorenz (reporter)
2010-09-10 02:40

 The same is true for Paraview 3.8
(0022271)
thorenz (reporter)
2010-09-20 03:48

 The situation can be "cured" by applying the "Clean to Grid"-Filter on the dataset first.
(0022348)
Takuya OSHIMA (reporter)
2010-09-26 02:19

 Can you share a dataset that causes the problem and give the exact procedure to replicate?
(0022358)
thorenz (reporter)
2010-09-27 03:31

 Hello Takuya,

I uploaded a testcase to our ftp:

   ftp://ftp.baw.de/incoming/test.zip [^]

Sorry, it is 800MB. Currently, I don't have a smaller one that shows the
problem.

The procedure is the following:

- load "result.foam"
- select "Decomposed case"
- Apply
- filter "Contour" with alpha1=0.5

I hope you can reproduce it :)

Carsten

P.S: Many thanks for vtkPOpenFOAMReader. It helps a lot :) I'm using it on our cluster and it gave me ~10x speed improve because of parallel data reading.
(0022359)
Takuya OSHIMA (reporter)
2010-09-27 06:09

 A 96 processor case. Cool :)
Yes it did reproduce, however only when I selected cell-alpha1 (alpha1 with a cube on its left) from the Contour By combo box. There should be another alpha1 (point-alpha1, alpha1 with a dot on its left), and when I selected it the contour filter ran fine (I attached arraySelectionScreenshot.png to show which array to choose).

If my understanding is right the contour filter only works with the point-arrays, so the cell-arrays should not be in the selection list. I'm not sure which (the reader or the contour filter) is causing the problem but anyhow, please try the point-alpha1.

Takuya
(0022360)
thorenz (reporter)
2010-09-27 08:49

 Hi Takuya,

the "point-alpha1" is not in the data set, it is generated by the OpenFOAM reader. Alpha1 is a cell centered quantity in OpenFOAM. You are right, using it without interpolating to the nodes causes the problem.

So, is this a bug in the reader or in the filter? I don't know, but I got a workaround now: Use the point data :)
(0022362)
thorenz (reporter)
2010-09-27 09:08

 Update: I just tried to read another unstructured dataset written from another code in Ensight format. It shows the same behaviour: The regarded quantity is cell centered, "Contour" filter gives garbage. Applying "Cell to point" first and "Contour" on the point data afterwards gives correct result. So, it seems to be a problem in the Contour filter.
(0022531)
Takuya OSHIMA (reporter)
2010-10-19 05:15

 I can confirm in the git master that the cell-arrays are no longer listed in the array selection of the contour panel, probably thanks to the following commit. Could someone please mark this bug as resolved?

commit a844b9eb4ca130b344da40435ec50764897d4b57
Merge: e98c0a7 2036cc1
Author: Robert Maynard <robert.maynard@kitware.com>
Date: Mon Oct 18 13:22:58 2010 -0400

    Merge topic 'AutomaticPropertyConversion'
    
    2036cc1 BUG: Corrected an issue with the contour filter supporting cell prop
(0023727)
thorenz (reporter)
2010-12-06 04:31
edited on: 2010-12-06 04:31

 Checked out Paraview-3.9 on 2010-12-06

Now it works o.k.
(0023732)
Robert Maynard (developer)
2010-12-06 09:26

 Corrected an issue with the contour filter supporting cell properties when it should only support point properties by default.
(0023780)
Alan Scott (manager)
2010-12-07 17:29

 As per reporter, and tested local server, windows client, trunk.

 Issue History
Date Modified Username Field Change
2010-09-07 04:23 thorenz New Issue
2010-09-07 04:23 thorenz File Added: pics.zip
2010-09-10 02:40 thorenz Note Added: 0022175
2010-09-20 03:48 thorenz Note Added: 0022271
2010-09-26 02:19 Takuya OSHIMA Note Added: 0022348
2010-09-27 03:31 thorenz Note Added: 0022358
2010-09-27 06:08 Takuya OSHIMA File Added: arraySelectionScreenshot.png
2010-09-27 06:09 Takuya OSHIMA Note Added: 0022359
2010-09-27 08:49 thorenz Note Added: 0022360
2010-09-27 09:08 thorenz Note Added: 0022362
2010-10-19 05:15 Takuya OSHIMA Note Added: 0022531
2010-12-05 21:34 David Partyka Assigned To => Robert Maynard
2010-12-05 21:34 David Partyka Status backlog => tabled
2010-12-06 04:31 thorenz Note Added: 0023727
2010-12-06 04:31 thorenz Note Edited: 0023727
2010-12-06 09:26 Robert Maynard Note Added: 0023732
2010-12-06 09:26 Robert Maynard Status tabled => @80@
2010-12-06 09:26 Robert Maynard Fixed in Version => 3.10
2010-12-06 09:26 Robert Maynard Resolution open => fixed
2010-12-07 17:29 Alan Scott Note Added: 0023780
2010-12-07 17:29 Alan Scott Status @80@ => closed

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