Automated assigning of Loading to Rigid Body Reference points using Python

Question

Hi, 
 I have a question which might have been already answered elsewhere but I couldn't find it. Basically I am trying to automate (using python) a load assignment procedure to a collection of rigid bodies (again which are multiple rigid bodies having same reference points and are automatically grouped with a filter criteria after parametric intersection). As a result, after parametric intersection, each rigid body is broken to multiple rigid bodies. I am grouping them based on the filter criteria after parametric intersection (during Staged Construction). 
 However, when I am trying to assign Fx or Fy or Fz etc. it is not recognising the python commend as any attributes. My code is as below: 
 LoadedRigidBody_Group_List = [] for EachRigidBody in g_i.RigidBodies: if (EachRigidBody.Xref.value == 0 and EachRigidBody.Yref.value == 0 and EachRigidBody.Zref.value == 0): LoadedRigidBody_Group_List.append(EachRigidBody) 
 LoadedRigidBody_Group = g_i.group(LoadedRigidBody_Group_List) 
 . 
 . 
 .LoadedRigidBody_Group.RigidBodies.Fx.set(Loadphase, Fx_Value) #LoadPhase is the Phase Object

The attribute Rigidbodies in " LoadedRigidBody_Group.RigidBodies.Fx.set" must be incorrect but do not know/want to know the correct way. 
 
 Thanks in anticipation 
 
 Regards 
 Sangeet

Stefanos Papavasileiou · Answer

Dear Sangeet, 
 No worries, usually Python questions are quite specific so I can help you out. 
 First of all, I can see that you are doing a for-loop on the g_i.RigidBodies which would give you the various intersected rigid body objects. That's correct. 
 Then, you have an if-statement based on the reference values and if that is satisfied you add the object to a list. This is important to understand as it will clarify the issue up next. 
 Following that, you create a group of the objects, which for instance are RigidBody_2_1, RigidBody_1_1, etc.. 
 The main command you see fail is the last one and that literally says: 
 "go to the PLAXIS group I created and set the Fx value of the group" 
 Do you see the problem? 
 You actually want to go to each item of the group and set the Fx value, not the whole group object. 
 So, two options: 
 
 You either make the last one a simple for-loop over the items of the group (behaves as a list) 
 You add to the list before making the group, the RigidBody_1_1.Fx, the RigidBody_2_1.Fx, etc. instead. In this way, you can set it directly. 
 
 As I assume you may want to set the Fy and Fz probably option 1 is the best solution. 
 I hope this helps.