| index | Target position in the IK chain where the bone will be inserted (0-based). Must be within the range [0, boneCount]. |
| transform | Transform of the bone to insert into the chain. |
| weight | Influence weight (0-1 range) of the inserted bone in IK calculations. Higher values increase the bone's contribution to reaching the IK goal. |
Inserts a bone transform with a custom influence weight at the specified index in the IK chain. Shifts existing bones at and beyond the index to the right.