Question #683065 on Yade changed: https://answers.launchpad.net/yade/+question/683065
Description changed to: Hi, In yade, O.interactions.geom.normal gives the unit vector oriented along the interaction, from particle #1, towards particle #2 (https://yade-dev.gitlab.io/trunk/yade.wrapper.html?highlight=o%20interaction#yade.wrapper.ChCylGeom6D.normal). My question is that the directions seems not always from Id1 towards Id2, for example: O.bodies.append(sphere((0,0,0),radius=1,color=[1,1,1])) O.bodies.append(sphere((0,0,1.5),radius=0.5,color=[0,0,1])) Gl1_Sphere.quality=3 O.engines=[ ForceResetter(), InsertionSortCollider([Bo1_Sphere_Aabb()]), InteractionLoop( [Ig2_Sphere_Sphere_ScGeom()], [Ip2_FrictMat_FrictMat_FrictPhys()], [Law2_ScGeom_FrictPhys_CundallStrack()] ), NewtonIntegrator(damping=0.4), ] ##run for one step to generate interactions O.step() After this, I use O.interactions[0,1].geom.normal and obtain the result as: In [2]: O.interactions[0,1].geom.normal Out[2]: Vector3(0,0,1). This is reasonable, however, when I change the Id of the two spheres like: O.bodies.append(sphere((0,0,1.5),radius=0.5,color=[0,0,1])) O.bodies.append(sphere((0,0,0),radius=1,color=[1,1,1])) Gl1_Sphere.quality=3 O.engines=[ ForceResetter(), InsertionSortCollider([Bo1_Sphere_Aabb()]), InteractionLoop( [Ig2_Sphere_Sphere_ScGeom()], [Ip2_FrictMat_FrictMat_FrictPhys()], [Law2_ScGeom_FrictPhys_CundallStrack()] ), NewtonIntegrator(damping=0.4), ] ##run for one step to generate interactions O.step() I use O.interactions[0,1].geom.normal again to check the normal vector and obtain: In [2]: O.interactions[0,1].geom.normal Out[2]: Vector3(0,0,1) which is the same as before, that means the vector normal isn't from Id1 towards Id2. I think it should be Vector3(0,0,-1). Could you please point out where is the problem? Thanks in advance! -- You received this question notification because your team yade-users is an answer contact for Yade. _______________________________________________ Mailing list: https://launchpad.net/~yade-users Post to : [email protected] Unsubscribe : https://launchpad.net/~yade-users More help : https://help.launchpad.net/ListHelp
