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IDProjectCategoryView StatusDate SubmittedLast Update
0000721VTK(No Category)public2004-03-26 21:542016-08-12 09:54
ReporterGoodwin Lawlor 
Assigned ToDavid Partyka 
PlatformOSOS Version
Product Version 
Target VersionFixed in Version 
Summary0000721: Picking a vtkPolyData with degenerate cells
DescriptionIf a degenerate triangle with two identical vertices is traversed by vtkCellPicker, a crash is caused.


"denom" on line 272 (vtkLine.cxx) will evaluate to zero and will cause a division by zero error.
Perhaps, a check here to return -1 if denom == 0, then a check in vtkTriangle::EvaluatePosition to return -1 (ie numerical error) if vtkLine::DistanceToLine returns -1
vtkTriangle::IntersectWithLine should also check for a error from vtkTriangle::EvaluatePosition and vtkLine::DistanceToLine and return 0;
TagsNo tags attached.
Attached Filespatch file icon vtkLine.cxx.patch [^] (578 bytes) 1969-12-31 19:00 [Show Content]
patch file icon vtkTriangle.cxx.patch [^] (597 bytes) 1969-12-31 19:00 [Show Content]

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-  Notes
Goodwin Lawlor (reporter)
2004-03-26 23:40

Rather than vtkTriangle::IntersectWithLine checking return values from vtkTriangle::EvaluatePosition and vtkLine::DistanceToLine, maybe just a check at the beginning of the method to see if the triangle is degenerate.

If fact perhaps every cell type should have a method to check itself for degeneracy, and each cell method should use this check before it executes.
Mathieu Malaterre (developer)
2004-03-30 18:39

Waht does :
vtkTriangle::ComputeNormal (pt1, pt2, pt3, n);

return in your case. Maybe we can check the result to determine if the triangle is degenerate.
Goodwin Lawlor (reporter)
2004-08-03 19:47

Uploaded two patches that fix a crash after cell picking a band-contoured polydata, ie, a polydata that could have some degenerate cells.
Dave DeMarle (administrator)
2013-07-22 20:33

Dave P no longer works on the project. If these old issues still exist in 6.0.0, reopen them and assign to Dave DeMarle
Kitware Robot (administrator)
2016-08-12 09:54

Resolving issue as `moved`.

This issue tracker is no longer used. Further discussion of this issue may take place in the current VTK Issues page linked in the banner at the top of this page.

- Issue History
Date Modified Username Field Change
2008-11-30 09:17 Mathieu Malaterre Assigned To Mathieu Malaterre => David Cole
2011-01-19 08:52 Utkarsh Ayachit Assigned To David Cole => David Partyka
2011-06-16 13:11 Zack Galbreath Category => (No Category)
2013-07-22 20:33 Dave DeMarle Status backlog => expired
2013-07-22 20:33 Dave DeMarle Note Added: 0031303
2016-08-12 09:54 Kitware Robot Note Added: 0036721
2016-08-12 09:54 Kitware Robot Status expired => closed
2016-08-12 09:54 Kitware Robot Resolution open => moved

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