Swing bones are added to the armature in edit mode. In Blender, bones are added using the add menu. Align the created bones to the elements of the model that need to move using the move, rotate, and scale tools. Please change the names of these added bones to something descriptive to their intended role. An example of a nice, descriptive name could be “LeftAntennaBase.” Related swing bones should be linked together in a parented chain. Using the extrusion tool can be useful for quickly creating these chains. Otherwise, manual parenting can be required. The structure of these parented bones show up in the hierarchy like so:

To enable swing bone physics to a bone, the bone needs to have its name altered to include “_physics_[A]_[B]_[C],” where A, B, and C represent integer numbers for drag, angleDrag, and restoreDrag respectively. Physics will also be applied to any child bone of the renamed bone, and its respective children. To change the physics properties of other bones in the chain, add the “_physics_[A]_[B]_[C]” naming convention to the bones with edited parameters. Items must have weights bound to the swing bone chain for the physics to behave properly. If the item is already bound to the armature, you can manually add weight vertex groups to the mesh with names that correspond to the bones. Paint weights to fit the bone structure like in the Rigging Guide.















Swing bone reactivity must be tested in Unity or ZEPETO Studio. To test the item’s swing bone reactivity, export the item from Blender, and import and convert the item in Unity.