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[Janek Kozicki <1718872@xxxxxxxxxxxxxxxxxx>]

moved from https://bugs.launchpad.net/yade/+bug/1718872 to
https://gitlab.com/yade-dev/trunk/issues/36

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https://bugs.launchpad.net/bugs/1718872

Title:
  Ip2_FrictMat_FrictViscoMat_FrictViscoPhys() law body assignation
  problem

Status in Yade:
  New

Bug description:
  Hi,

  I was working with the Ip2_FrictMat_FrictViscoMat_FrictViscoPhys() law and I think there is a bug with it. In this little script, the two particles must be glued after contact, it is the case with the option 2 but in the option 1 it is not. The difference between the two options is only the position of the spheres (in one case the frictmat in on the top and in the other case this is the frictviscomat).
  I think the bug comes from this assignation of the material 1 and 2 in the C++ code but I'm not enough familiar with it to solve it.

  I'm working with yadedaily : Yade 2017.01a-99-968a759~trusty

  Loïc

  Here's the script:
  ###########################################################################################

  from yade import qt, plot
  from yade.gridpfacet import *
  import gts, os, locale, sys
  import numpy as np

  O.engines=[
      ForceResetter(),
      InsertionSortCollider([Bo1_Sphere_Aabb(aabbEnlargeFactor = 1)]),
      InteractionLoop([Ig2_Sphere_Sphere_ScGeom(interactionDetectionFactor = 1)],
              [Ip2_FrictMat_FrictViscoMat_FrictViscoPhys()],
              [Law2_ScGeom_FrictViscoPhys_CundallStrackVisco()]),
      NewtonIntegrator(gravity=(0,0,0),damping=0.3,label='newton'),
  ]

  R = 0.008

  ##### Materiaux #####

  FrictViscoMat = O.materials.append( FrictViscoMat(betan = 1,young=5e9, poisson=0.3, frictionAngle=radians(10),density = 4000))
  FrictMat = O.materials.append( FrictMat(young=5e9, poisson=0.3, frictionAngle=radians(10),density = 4000))

  #### Option 1 => Not Working
  s1 = O.bodies.append(utils.sphere((0,0,2), radius=R,color=[1,0,0], material = FrictViscoMat))
  s2 = O.bodies.append(utils.sphere((0,0,0), radius=R,color=[0,1,0], material = FrictMat))
  O.bodies[s1].state.vel[2] = -5
  O.bodies[s2].state.vel[2] = 5

  #### Option 2 => Working
  #s1 = O.bodies.append(utils.sphere((0,0,0), radius=R,color=[1,0,0], material = FrictViscoMat))
  #s2 = O.bodies.append(utils.sphere((0,0,2), radius=R,color=[0,1,0], material = FrictMat))
  #O.bodies[s1].state.vel[2] = 5
  #O.bodies[s2].state.vel[2] = -5

  #######
  v=qt.Controller()
  v=qt.View()
  v.viewDir = (0,1,0)
  v.eyePosition = Vector3( 0, -5,1)
  O.run()
  O.dt = 1e-7
  O.saveTmp()

  #########################################################################################

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