void FillMirrorBoneIndexes ( const [USkeleton](API\Runtime\Engine\Animation\USkeleton) * Skeleton, TCustomBoneIndexArray< [FSkeletonPoseBoneIndex](API\Runtime\AnimationCore\FSkeletonPoseBoneIndex), [FSkeletonPoseBoneIndex](API\Runtime\AnimationCore\FSkeletonPoseBoneIndex) > & OutMirrorBoneIndexes ) const