Hi everyone,
I am working on a Modular Control Rig for a hybrid/creature character in Unreal Engine 5.8, and I am facing an issue with the Left HindLeg module.
The character has an animal-style leg hierarchy, so I am using the HindLeg module instead of the normal Leg module. My leg bone chain is similar to this:
FemNis-L-Thigh
└── FemNis-L-Calf
└── FemNis-L-HorseLink
└── FemNis-L-Foot
For the left HindLeg module, I connected it like this:
HindLeg Primary → thigh_l_socket
Thigh → FemNis-L-Thigh
Upper Knee → FemNis-L-Calf
Lower Knee → FemNis-L-HorseLink
Foot Bone → FemNis-L-Foot
Pole Vector Parent → root_ctrl
Settings Control → global_ctrl
Parent Control → root_ctrl
The socket thigh_l_socket is created under the FemNis-L-Thigh bone in the Skeleton asset.
The problem is that when I compile the Modular Rig or try to move/test the leg control, the left hind leg breaks/deforms incorrectly. The control appears, but the leg does not behave properly. It looks like the IK chain or knee/hock direction is solving incorrectly.
The right side is either working better or is easier to configure, but the left HindLeg specifically breaks.
Things I have already checked:
- The socket is placed under the correct thigh bone
- Parent Control and Pole Vector Parent are set to root_ctrl
- Settings Control is set to global_ctrl
- I am using HindLeg because the skeleton has a HorseLink/hock-style joint
- I compiled and saved after setting the module
My questions:
- For a HindLeg chain like
Thigh → Calf → HorseLink → Foot, shouldUpper Kneebe the calf andLower Kneebe the HorseLink? - Is there a specific axis setting I need to adjust for the HindLeg module?
- Could this be related to the character’s bone orientation or mirrored left-side axis?
- Is there a recommended setup for creature/hybrid legs using the Modular Control Rig HindLeg module in UE 5.8?
Any guidance would be really appreciated. I can share screenshots of the bone hierarchy and module settings if needed.
Thanks.
