UE5 - Model disappears when adding Full Body IK, what is setup wrong?

I’ve been able to setup “Full Body IK” for the UE mannequin. When trying to use my own model, it simply disappears once i setup a full body IK and specify a root/effector. I’m sure it has to do with my model. I’ve simplified it as much as I can and it still happens. I’ve verified everything works as expecting when manually rotating bones in the Skeleton.

Any idea what I’m missing? I attached the model I’m attempting to use, if that helps.


SkowDinoMech.fbx (3.2 MB)

It is worth noting this is many meshes on a single armature… not sure if that is relevant.

I’ve solved it, I needed to set my Blender scale to .01 to match Unreal’s cm based scale before exporting. When applying the bones in unreal, they had a scale of 100, and were shrinking the mesh to be absolutely tiny.

Though issue solved, for guys who’s making skinned mesh in Blender, I’d highly recommand a FBX plugin named Better Fbx Importer & Exporter. You can find it in Blender Market. This plugin really makes Blender fbx exporting painless.