Hole - Protrusion Other geometry is protruding into the hole. FeatureWorks cannot recognize holes that have a protrusion of other geometry into the hole. Try recognizing the protrusion first, before recognizing the hole. Example Parent topicHoles Hole - Planar Face Hole - Spline Face Hole - Unknown Volume Type Hole - Mixed Volume Hole - Large Diameter Hole - Multiple Hole - Partial Hole - Invalid Selection Hole - General Failure