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Change in triangle::intersection breaks stitchMesh in 1.5 and 1.6 

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August 11, 2009, 16:47 
Change in triangle::intersection breaks stitchMesh in 1.5 and 1.6

#1 
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Bernhard Gschaider
Join Date: Mar 2009
Posts: 3,926
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This problem seems to have been introduced between 1.4.1 and 1.5: in earlier versions of OF even when the triangle was not hit the pointHit returned by triangle::intersection got some value. In 1.5 and 1.6 vector::zero is returned. Nevertheless this point value is then used in triangle::ray to calculate the distance to this point. I guess usually this distance is not used, but in slidingInterface:rojectPoints() (approx line 303 of the source file) this distance is used to discard points. Consequently stitchMesh fails (Usually complaining about "Duplicate point found in cut face.") for some meshes
After applying the attached patches to 1.5.x and 1.6 and recompiling stitchMesh happily stitched meshes on which previously it failed. I don't know whether these patches affect other utilities as well If you want a mesh to verify the bug/fix, I can provide you with one Bernhard 

August 12, 2009, 06:12 

#2 
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Mattijs Janssens
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Thanks. I would like to leave the fast intersection() routine intact since it is used all over so want to recalculate the intersection with plane inside the ray() routine. Can you try attached triangleI.H and/or post the testcase?


August 12, 2009, 06:19 

#3 
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Mattijs Janssens
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Missing attachment.


August 12, 2009, 09:26 

#4 
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Bernhard Gschaider
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Yep. That fixes it. I'll mail you about the testcase


August 12, 2009, 10:25 

#5 
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Mattijs Janssens
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I've pushed the fix to 1.6.x and 1.5.x.


February 11, 2010, 10:46 
compiled stitchMesh.C

#6  
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X.G. Li
Join Date: Nov 2009
Location: Bremen, Germany
Posts: 19
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Quote:
Bernhard,,may you send me your recompiled stitchMesh.C,because i really donīt know where this patch should be put in the cold file.. Thank you very much! My email is xgli@iwt.unibremen.de 

February 12, 2010, 08:27 

#7  
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Bernhard Gschaider
Join Date: Mar 2009
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Quote:
The relevant patches should be in 1.5.x and 1.6.x so if you got one of those, everything's OK Bernhard 

February 12, 2010, 10:21 
Thank you very much,,,I will have a try....

#8  
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X.G. Li
Join Date: Nov 2009
Location: Bremen, Germany
Posts: 19
Rep Power: 8 
Thank you very much,,,I will have a try....
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