public bool IsClosed()

Public Function IsClosed As Boolean

public:
bool IsClosed()

member IsClosed : unit -> bool 

Return Value

In a closed mesh all edges are connected to 2 faces. For example: The mesh of a sphere is a closed mesh. An object with holes, like a pullover, is not closed. A flat object, like a curtain, is closed if both sides are modeled with faces. It is not closed if only a one side is modeled with faces. (A single vertex is considered as closed. A single edge-pair is also considered as closed.)

This method does not check whether the mesh IsValid.

Reference