The selected faces contain both upward and downward pointing faces. Only the upward pointing faces were used.

public static FailureDefinitionId OnlyUpwardFacesUsed { get; }

Public Shared ReadOnly Property OnlyUpwardFacesUsed As FailureDefinitionId
	Get

public:
static property FailureDefinitionId^ OnlyUpwardFacesUsed {
	FailureDefinitionId^ get ();
}