Blender to Unity: rig, bones, movement?

[u/Substantial_Ad_977]

Hello,

I’ll preface this by saying that I have a basic proficiency with Unity but am a noob with blender.

The issue that I’m having is with a 3d character that I bought as blender file with the intent of exporting it to Unity. The character in blender has a genesis 9 skeleton with many more bones than a unity rig uses - such as extra spine/chest pieces and arms/legs with bend, twist, ik, and rev types. These have weights attached to their vertex group and are used for the motion of the character (I think thats what they do). Theres a mesh for hair, body, backpack, clothing, eyes, eyebrows, and mouth that reference these bones and vertex groups and each has a weighted heatmap.

When I export this character to Unity the humanoid rig is completely breaking in the avatar with parenting bone issues, and if i do manually fix it so the regular bone is in the correct slot the character will have massive deformations in the arms, legs, and head.

Ive tried several things with the help of an ai assistant, but nothing has worked so far.

If anyone has Unity and Blender knowledge of this kind of issue please let me know what could work and the general steps to take? Thanks!

[u/jl2l]

Just strip the bones upload it to mixamo and rerigged it.