This registry entry defines the threshold of degrees parallel to your view angle.
This works with the registry entry "LabelIDViewAngleHide". If that entry is set to TRUE, PC-DMIS hides ID labels dynamically when they cross this threshold of degrees parallel to your view angle during a part rotation.
Entry Name: LabelIDViewAngle
Entry Type: Double value to specify the number of degrees for the threshold. The default value is 30.