MantisBT - VTK |
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| ID | Project | Category | View Status | Date Submitted | Last Update |
| 0014563 | VTK | (No Category) | public | 2014-02-10 10:30 | 2016-08-12 09:55 |
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| Reporter | Gerrick Bivins | |
| Assigned To | Will Schroeder | |
| Priority | high | Severity | minor | Reproducibility | have not tried |
| Status | closed | Resolution | moved | |
| Platform | | OS | | OS Version | |
| Product Version | 5.10.1 | |
| Target Version | | Fixed in Version | | |
| Project | TBD |
| Type | incorrect functionality |
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| Summary | 0014563: vtkPolyDataNormals detecting feature edges incorrectly with vtkCutter |
| Description | Hi All,
I’ve run into a situation where vtkPolyDataNormals is producing “incorrect” results for a plane in the x vs a plane in the y.
Using the default settings for “FeatureAngle” ie 30, and creating a slice plane in the x and y directions of my dataset, the attached
result is produced.
The issue is the edge is being detected as a “FeatureEdge” and so it’s vertices are duplicated, despite the faces being coplanar.
So when I looked at the code in vtkPolyDataNormals, I found the following code:
if ( vtkMath::Dot(thisNormal,neiNormal) > CosAngle )
{
//found feature edge
….
}
In my case, the CosAngle is cos(30) so this is positive but I’m guessing(because I’m just looking at the code)
that the cutter has produced polygons whose normals are opposite each other, ie 180 so this is ~ -1, which is less than cos(30),
which results in the duplication of the vertices.
Is there a way around this without modifying VTK source? I tried calling polydatanormals in two passes,
one that does the orientation and then connect the output of that to a new polydatanormals that only performs the splitting but this didn’t seem
to have an effect on the output.
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| Steps To Reproduce | |
| Additional Information | |
| Tags | ComputeNormal, hackaton, normal of polygon, polyhedron, VTK |
| Relationships | |
| Attached Files |  polydata-normals-with-cutter-bug.png (61,687) 2014-02-10 10:30
https://www.vtk.org/Bug/file/9606/polydata-normals-with-cutter-bug.png
polydata-normals-with-cutter-bug-with-glyphs.png (63,541) 2014-02-10 16:29
https://www.vtk.org/Bug/file/9607/polydata-normals-with-cutter-bug-with-glyphs.png
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| Issue History |
| Date Modified | Username | Field | Change |
| 2014-02-10 10:30 | Gerrick Bivins | New Issue | |
| 2014-02-10 10:30 | Gerrick Bivins | File Added: polydata-normals-with-cutter-bug.png | |
| 2014-02-10 16:28 | Gerrick Bivins | Tag Attached: ComputeNormal | |
| 2014-02-10 16:28 | Gerrick Bivins | Tag Attached: normal of polygon | |
| 2014-02-10 16:28 | Gerrick Bivins | Tag Attached: VTK | |
| 2014-02-10 16:28 | Gerrick Bivins | Tag Attached: polyhedron | |
| 2014-02-10 16:29 | Gerrick Bivins | File Added: polydata-normals-with-cutter-bug-with-glyphs.png | |
| 2014-02-12 09:31 | Gerrick Bivins | Note Added: 0032310 | |
| 2014-10-02 09:45 | Will Schroeder | Assigned To | => Will Schroeder |
| 2014-10-02 10:02 | Will Schroeder | Tag Attached: hackaton | |
| 2014-10-07 21:09 | Will Schroeder | Note Added: 0033615 | |
| 2014-10-07 21:10 | Will Schroeder | Note Added: 0033616 | |
| 2014-10-07 21:10 | Will Schroeder | Status | backlog => active development |
| 2016-07-06 16:48 | Berk Geveci | Status | active development => expired |
| 2016-07-06 16:48 | Berk Geveci | Note Added: 0036244 | |
| 2016-08-12 09:55 | Kitware Robot | Note Added: 0037320 | |
| 2016-08-12 09:55 | Kitware Robot | Status | expired => closed |
| 2016-08-12 09:55 | Kitware Robot | Resolution | open => moved |
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Notes |
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(0032310)
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Gerrick Bivins
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2014-02-12 09:31
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In further testing I was able to work around this by using vtkPolydataNormals in twice.
1) consistency on, splitting and auto-orient off
2) consistency on, splitting on, auto-orient on
Looking at the code, it seems that auto-orient is the root cause in this issue but without it, some output is "dark" ie normals are inward. |
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(0033615)
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Will Schroeder
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2014-10-07 21:09
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Do you have sample data and/or test program? The cutter should not be producing two polygons on top of each other, something else is going on. |
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(0033616)
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Will Schroeder
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2014-10-07 21:10
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Please provide data or example test |
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(0036244)
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Berk Geveci
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2016-07-06 16:48
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Setting to status of bugs that have not been updated in the last year to expired. Please re-open if still important. |
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(0037320)
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Kitware Robot
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2016-08-12 09:55
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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. |
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