Custom IK rig is missing bones when imported

[GrayzcaIe]

I have a custom rig with IK constraints. This is bones layout (the selected bones are IK bones):

---

After importing to studio, the IK bones disappear:

---

The weird part is that only the “IKBackLegTarget” bones are visible on Studio:

---

This causes the animations to bug out because the bones are missing. Not sure what could be the problem. Let me know if you have any suggestions to fix this.

[GrayzcaIe]

Fixed the issue. The first thing to note is that each vertex only supports 1-4 joint influences. Keeping this in mind, the reason why the bones didn’t import is that the IK bones didn’t have any assigned vertices to any mesh and Studio decided not to pick that up. What I did was add a “fake” mesh into the rig comprising of four vertices. I assigned 3 IK bones to each vertex and it turned out to be working.

---