VCI Attachable component allows you to attach a VCI on an avatar.
When a VCI is attached, the VCI will retain the relative position to the attached bone.

Attachable places correspond to bone mapping listed in Unity Humanoid Avatar.

• Attach VCIAttachable to the same object as SubItem.
• In addition to VCIAttachable, you need SubItem(Grabbable)＋Collider＋Rigidbody
• Recommended settings (The settings below will make an object freeze in the air)
• Rigidbody … UseGravity: disabled Is Kinematic: enabled
• Collider … Is Trigger: enabled

• List of attachable bone corresponds to Humanoid Avatar.
• If any of the target bone exists in the range of “SubItem's Transform + Distance” at the time of ungrab, the item will be attached.
• When you set RightHand and LeftHand as the attachable bones,
  passing an item from one hand to the other will switch the attaching hand.

When an attachable VCI is attached to someone by another person,
the ownership of the VCI is passed to the receiver automatically.
When attaching was not successful, the ownership of the SubItem will remain with the grabbed user as usual.

The behavior of VCIAttachable when the Offset is set to the upper-right of the cube. When the Scalable is checked, the attachable area scales in sync with the size of the SubItem. The Offset always moves in sync with the size of the SubItem. When the Scalable and Offset is not specified, it behaves the same as in the old versions.

Scalable: Off

Scalable: On

• Naze Nani VirtualCast#05～Play with attachable VCI (Japanese article)