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I've manage to almost rig it, without APEX, just kinefx, but just almost. I'm almost there, but my problem now is that I'm able to make a lookup pointing to the ik target, I replace the Y position of the target with the shoulder Y value in a rigattributeVop, but it's not enough, when I rotate the body it's not working because I should point to the target projected on a plane (XZ plane of the shoulder bone) and not just I'm failing at making the rigvop network that would "project" the target position into the right plane. I'm also wondering if there isn't a way more straight forward approch to rig this. If I could lock rotation on the joints of the IKchain, I wouldn't even need the lookat ! There's a node called ConfigureJointLimit ! But it's not doing nothing to the IKchain. Seems to be for ragdolls and fullbodyIK.   here is where I'm at now, without apex (hip file attachment) 6ril_IK_kinefx.hipnc

Hey thanks for the advice. Haven't resolved it yet unfortunately. Will try with Karma and have a look at the drivers, haven't updated them in a little while

Hey, I checked your setup. Since you want to spread apart in different directions realistically, -In vellumSolver set your gravity to 0 in all directions. (pushing by -5 on X axis is keeping you away from getting those nice rotations) -More importantly, you are applying wind drag force although it's minimal and set to 0.03, it gradually slows down your rotations. Just set it to 0 as well and your pieces will maintain their rotations. About your rbd setup; Your fractured geometry is changing each frame due to animation, which is causing this error. -Add a timeshift node before your materialfracture and set your frame to 0. -Also make sure to connect your scatter to this timeshift, so your simulation input geometery doesn't change.  Then it works as expected. You just need to adjust your constraits to get the correct behaviour. 

@CCILko horizontal - vertical  Play with the File.  

I've made some progress using xyzdist and primuv, but the result is still not quite what I'd like it to be. Hand_Trail_xyzdist.hipnc