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[Jérôme Duriez <jerome.duriez@xxxxxxxxxxx>]

Public bug reported:

Hello,

It seems the pack.gtsSurfaceBestFitOBB() function is broken in recent
YADE versions. Just type the following (using a gts file present in the
sources) in your YADE terminal:

******************************
import gts
surface=gts.read(open('parallellepiped.gts')) # the one from examples/jointedCohesiveFrictionalPM

pred=pack.inGtsSurface(surface)
print 'Dim from pred.dim = ',pred.dim()

center,dim,orientation=gtsSurfaceBestFitOBB(surface)
print 'Dim from gtsSurfaceBestFitOBB =',dim
*******************************


I get the correct output with a not up to date YADE version as follows:
*******************************
Dim from pred.dim =  Vector3(0.9999999404,2.0000000002092895,1)
Dim from gtsSurfaceBestFitOBB = Vector3(0.4999999702,1.0000000001046447,0.5) # two are "equal" with a normal factor 2
*******************************


Whereas an up to date YADE version returns:
*******************************
Dim from pred.dim =  Vector3(0.9999999404,2.0000000002092895,1)
Dim from gtsSurfaceBestFitOBB = Vector3(6.91989746778284e-310,3.47644378095352e-310,5e-324)
*******************************

These two versions differ for instance in the related function bestFitOBB() in py/pack/_packObb.cpp, in relation with this commit: (the difference is exactly the one introduced by this commit)
https://github.com/yade/trunk/commit/4f66360db75afb82029bbe37ae4a4dac36899a33


The bug affects for instance the use of randomDensePack() function with GTS predicates:
https://answers.launchpad.net/yade/+question/297125


Any ideas ? (Anton, we need you once again ?)

Jerome

** Affects: yade
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1604125

Title:
  gtsSurfaceBestFitOBB() broken

Status in Yade:
  New

Bug description:
  Hello,

  It seems the pack.gtsSurfaceBestFitOBB() function is broken in recent
  YADE versions. Just type the following (using a gts file present in
  the sources) in your YADE terminal:

  ******************************
  import gts
  surface=gts.read(open('parallellepiped.gts')) # the one from examples/jointedCohesiveFrictionalPM

  pred=pack.inGtsSurface(surface)
  print 'Dim from pred.dim = ',pred.dim()

  center,dim,orientation=gtsSurfaceBestFitOBB(surface)
  print 'Dim from gtsSurfaceBestFitOBB =',dim
  *******************************

  
  I get the correct output with a not up to date YADE version as follows:
  *******************************
  Dim from pred.dim =  Vector3(0.9999999404,2.0000000002092895,1)
  Dim from gtsSurfaceBestFitOBB = Vector3(0.4999999702,1.0000000001046447,0.5) # two are "equal" with a normal factor 2
  *******************************

  
  Whereas an up to date YADE version returns:
  *******************************
  Dim from pred.dim =  Vector3(0.9999999404,2.0000000002092895,1)
  Dim from gtsSurfaceBestFitOBB = Vector3(6.91989746778284e-310,3.47644378095352e-310,5e-324)
  *******************************

  These two versions differ for instance in the related function bestFitOBB() in py/pack/_packObb.cpp, in relation with this commit: (the difference is exactly the one introduced by this commit)
  https://github.com/yade/trunk/commit/4f66360db75afb82029bbe37ae4a4dac36899a33

  
  The bug affects for instance the use of randomDensePack() function with GTS predicates:
  https://answers.launchpad.net/yade/+question/297125

  
  Any ideas ? (Anton, we need you once again ?)

  Jerome

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