LimitAngle1 determines the maximum angle between the rod and
RodConstraint/LimitsEnabled|LimitsEnabled is true. Otherwise, this property is hidden in the Properties window and does nothing.
In the image below, the two parts are joined by a RodConstraint with 45 degree limits on each end. The red part is not
RodConstraint/LimitsEnabled, which determines if this property is visible and functional
RodConstraint/LimitAngle0, which works for the other attachment
Constriant/Attachment1, the attachment that is affected by this property