New question #692057 on Yade: https://answers.launchpad.net/yade/+question/692057
Hi, When I was trying to calculate the rotation angle of spheres, I found the following state parameters may be useful, but I didn't fully understand the meaning of each parameter. For example, for one typical sphere, I got: 1.O.bodies[i].state.ori #get current orientation I got: Quaternion((-0.8571073592023137,0.483498130637521,-0.17775413489215533),2.167483435911097), this quaternion is composed of a unit vector and a value, how to use the vector and the value to represent the orientation? 2.O.bodies[i].state.refOri # get reference orientation I got: Quaternion((1,0,0),0) How yade define the refOri for a particle? I suppose refOri will not change, am I right? 3.O.bodies[i].state.rot() #Rotation from reference orientation (as rotation vector) I got: Vector3(-1.8577660038685175,1.0479741894508063,-0.3852791430434534) How can I use this vector to calculate the rotation angle? Is this vector related to ori and refOri? 4.O.bodies[i].state.refPos I got: Vector3(0.06797544633577166,0.012988671946374571,0.03281123240261211) Can the displacement of the sphere be calculated by O.state.pos-O.state.refPos? Thanks in advance Have a good weekend Leonard https://yade-dem.org/doc/yade.wrapper.html?highlight=state%20ori#yade.wrapper.State.ori -- 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
