Sets whether the
HingeConstraint will limit the range of rotation. If enabled, the constraint will only allow the
HingeConstraint/CurrentAngle to be between
HingeConstraint/UpperAngle. If the
Attachment reach the end of the limited range of rotation then they will stop rotating. If
HingeConstraint/Restitution is greater than 0 then the attachments will bounce when they hit the ends of the limited range.
For example, here is the result if LowerAngle is set to -90 and UpperAngle is set to 45. Note that the x-axis of the Attachment in PartA is pointed away from the camera: