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Question Animation Rigging - Multi Rotation throws off Hand & Arm position from IK targets

Discussion in 'Animation Rigging' started by acMacav, Jan 1, 2024.

  1. acMacav

    acMacav

    Joined:
    Apr 1, 2018
    Posts:
    12
    Hello Everyone,

    I’m currently using Animation Rigging for animating characters and objects during Cinematics made with Timelines and Sequences, rigging the characters in a way so that they’re able to move their hands/feet with Two Bone IK targets as well as their Head and Upper Body by having Multi-Rotation set on each of the spine bones on a character’s body, with the source object being their head, and when the character moves their head via Multi-Aim target, their spine rotates according to their head position as needed to create much more fluid upper-body movement within these cinematics.

    The problem that I’m encountering with Multi-Rotation being set up on the spine and having the body move and orient to follow the head with it's Multi-Aim target, is that the position of the arms and hands move away from their hand IK targets.

    The Hand IK targets themselves are Multi-Parented to empties, which these empties are child objects of another character's spine bone, and then these empties are animated for challenging animations where a character needs to get onto or hold onto an object/character while they also move. What I want to have happen is that as a character’s upper body moves, their hands and arms stay in place with the Hand IK targets on those Multi-Parented empties, rather than being overwritten by their spine Multi-Rotation as shown below.
    01 - MultiParent throws off hand positions from their IK targets.png

    10 - mRotation setup.png

    I have the character rigs set up so that the Multi-Rotation is further down the rig hierarchy than the HeadLookatIK and Hand IK targets, but I'm not sure if this is a hierarchical issue, constraint issue, or if I’m missing something with how I’m animating the empty targets that the character's Hand IK targets are also Multi-Parented to.
    07 - Player Rig Heirarchy + Targets.png
    09 - ToppoTargets.png

    Any help on this would be greatly appreciated, thanks!
     
    Last edited: Jan 3, 2024
    brian-nielsen likes this.