MantisBT - ParaView
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IDProjectCategoryView StatusDate SubmittedLast Update
0007478ParaView(No Category)public2008-08-10 19:272009-05-13 13:50
ReporterSven Buijssen 
Assigned ToUtkarsh Ayachit 
PrioritynormalSeverityfeatureReproducibilityalways
StatusclosedResolutionwon't fix 
PlatformOSOS Version
Product Version 
Target VersionSomedayFixed in Version 
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Topic Name
Type
Summary0007478: Stream Tracer with Point Source seed does often not work for 2-D data
DescriptionTry this:

* Create plane from Sources menu
* Apply filter "Random vectors"
* Apply filter "Stream Tracer"
- set the vectors to "BrownianVectors"
Result: you see nothing.

* increase the number of points or the radius
Result: in most cases you still see nothing.

* change seed type to "line source" (default diagonal line)
Result: visible stream lines.


The same happens when starting with a box source and applying a slice filter first. (If you prefer to test it with "real" data, use the vtk file from bug 7395.)
Steps To Reproduce
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Issue History
Date ModifiedUsernameFieldChange
2008-08-10 19:27Sven BuijssenNew Issue
2008-08-11 13:09Ken MorelandNote Added: 0012982
2008-08-11 13:09Ken MorelandSeverityminor => feature
2008-08-11 13:09Ken MorelandCategory3.4 => Someday
2009-02-18 08:56Utkarsh AyachitNote Added: 0015130
2009-02-18 08:56Utkarsh AyachitStatusbacklog => @80@
2009-02-18 08:56Utkarsh AyachitResolutionopen => won't fix
2009-02-18 08:56Utkarsh AyachitAssigned To => Utkarsh Ayachit
2009-02-18 18:48Alan ScottNote Added: 0015190
2009-02-18 18:48Alan ScottStatus@80@ => closed
2009-05-13 13:50Utkarsh AyachitTarget Version => Someday
2011-06-16 13:10Zack GalbreathCategory => (No Category)

Notes
(0012982)
Ken Moreland   
2008-08-11 13:09   
This is not totally unexpected behavior. The point source actually defines a set of points (by default 100) randomly placed within a sphere of a given radius. Since the target geometry is 2D, it is unlikely that any of the points placed randomly in the 3D sphere to land in the 2D plane.

As the random placement in a sphere is an important feature for many (perhaps most) uses of the stream tracer, it is not clear how to "fix" this for 2D geometry. You can get around the problem by setting the radius to 0 and the number of points to 1.
(0015130)
Utkarsh Ayachit   
2009-02-18 08:56   
Refer to Ken's explanation.
(0015190)
Alan Scott   
2009-02-18 18:48   
Closed. See Ken's explanation above for details.