ExternalSurface Class

SystemObject
  SystemMarshalByRefObject
    Teigha.RuntimeDisposableWrapper
      Teigha.GeometryEntity3d
        Teigha.GeometrySurface
          Teigha.GeometryExternalSurface

	Name	Description
	ExternalSurface	Default constructor for the ExternalSurface class. Creates a default corresponding C++ object with a pointer to the surface definition set to NULL, undefined entity for a surface type (no information about the system that created an external surface in other words) and an option to prevent creating a copy of the external surface.
	ExternalSurface(IntPtr, ExternalEntityKind)	Sets the parameters for this external surface according to the arguments.

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	Name	Description
	AutoDelete	Property that indicates whether the object should be automatically deleted by the Garbage Collector. (Inherited from DisposableWrapper)
	ExternalSurfaceDefiniton	Property that represents a pointer to an external surface definition.
	ExternalSurfaceKind	Property that represents information about the system that created the surface.
	IsCone	Property that indicates whether the external surface is a cone.
	IsCylinder	Property that indicates whether the external surface is a cylinder.
	IsDefined	Property that indicates whether the surface is defined (not an empty instance).
	IsDisposed	Property that indicates whether pointer to native code unmanaged object == IntPtr::Zero. (Inherited from DisposableWrapper)
	IsEllipCone	Property that indicates whether the external surface is an elliptical cone.
	IsEllipCylinder	Property that indicates whether the external surface is an elliptical cylinder.
	IsNativeSurface	Property that indicates whether the external surface can be represented as a native OdGeSurface.
	IsNormalReversed	Property that indicates whether the normal of this surface is reversed an odd number of times. (Inherited from Surface)
	IsNurbSurface	Property that indicates whether the external surface can be represented as an OdGeNurbSurface.
	IsOwnerOfSurface	Property that indicates whether the external surface owns the data. If the external surface owns the data, it will be destroyed when the surface is destroyed.
	IsPlane	Property that indicates whether the external surface is a plane.
	IsSphere	Property that indicates whether the external surface is a sphere.
	IsTorus	Property that indicates whether the external surface is a torus.
	nativeSurface	Property that represents a handle to a native external surface definition. See also, IsNativeSurface property.
	ReverseNormal	Property that creates a surface with a reversed normal vector orientation (the same exact surface but with changed normal orientation). (Inherited from Surface)
	UnmanagedObject	Property that represents a pointer to an unmanaged object. (Inherited from DisposableWrapper)

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	Name	Description
	Clone	Clones this entity and returns a handle to the cloned entity. (Inherited from Entity3d)
	ClosestPointTo(Point3d)	Gets a point on this surface that is the closest to the specified point. (Inherited from Surface)
	ClosestPointTo(Point3d, Tolerance)	Gets a point on this surface that is the closest to the specified point according to a tolerance. (Inherited from Surface)
	Create	Creates an object based on the passed pointer and returns a handle to the created object.
	CreateObjRef	(Inherited from MarshalByRefObject)
	Dispose	(Inherited from DisposableWrapper)
	DistanceTo(Point3d)	Retrieves the distance from the closest point on this plane to the specified point. (Inherited from Surface)
	DistanceTo(Point3d, Tolerance)	Retrieves the distance from the closest point on this plane to the specified point according to a tolerance. (Inherited from Surface)
	Equals	Checks objects for equality. (Inherited from DisposableWrapper)
	EvaluatePoint(Point2d)	Retrieves the 3D point on this surface that corresponds to the specified point parameter value. (Inherited from Surface)
	EvaluatePoint(Point2d, Int32, Vector3dCollection)	Retrieves the 3D point on this surface that corresponds to the specified point parameter value. (Inherited from Surface)
	EvaluatePoint(Point2d, Int32, Vector3dCollection, Vector3d)	Retrieves the 3D point on this surface that corresponds to the specified point parameter value. (Inherited from Surface)
	GetClosestPointTo(Point3d)	Gets a point on this surface that is the closest to the specified point. (Inherited from Surface)
	GetClosestPointTo(Point3d, Tolerance)	Gets a point on this surface that is the closest to the specified point according to a tolerance. (Inherited from Surface)
	GetEnvelope	(Inherited from Surface)
	GetHashCode	Retrieves the object hash code. (Inherited from DisposableWrapper)
	GetLifetimeService	(Inherited from MarshalByRefObject)
	GetType	(Inherited from Object)
	InitializeLifetimeService	(Inherited from MarshalByRefObject)
	IsClosedInU	(Inherited from Surface)
	IsClosedInU(Tolerance)	(Inherited from Surface)
	IsClosedInV	(Inherited from Surface)
	IsClosedInV(Tolerance)	(Inherited from Surface)
	IsEqualTo(Entity3d)	Checks whether this entity is equal to the specified entity. (Inherited from Entity3d)
	IsEqualTo(Entity3d, Tolerance)	Checks whether this entity is equal to the specified entity within a geometric tolerance. (Inherited from Entity3d)
	IsOn(Point3d)	Checks whether the specified point is on this entity. (Inherited from Entity3d)
	IsOn(Point3d, Tolerance)	Checks whether the specified point is on this entity according to a geometric tolerance. (Inherited from Entity3d)
	IsOn(Point3d, Point2d)	(Inherited from Surface)
	IsOn(Point3d, Point2d, Tolerance)	(Inherited from Surface)
	Mirror	Mirrors this entity about the specified plane. (Inherited from Entity3d)
	ParameterOf(Point3d)	Retrieves a 2D point (U, V) that represents parametric values for the passed 3D point on this surface. (Inherited from Surface)
	ParameterOf(Point3d, Tolerance)	Retrieves a 2D point (U, V) that represents parametric values for the passed 3D point on this surface. (Inherited from Surface)
	RotateBy	Rotates this entity by the specified angle about the axis defined by the point and the vector. (Inherited from Entity3d)
	ScaleBy	Scales this entity by the scale factor about the specified point. (Inherited from Entity3d)
	Set	Sets the parameters for this external surface according to the arguments.
	SetToOwnSurface	Forces this external surface to own the data.
	ToString	(Inherited from Object)
	TransformBy	Applies the specified 2D transformation matrix to this entity. (Inherited from Entity3d)
	TranslateBy	Translates this entity by applying a 3D translation vector. (Inherited from Entity3d)

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OdGeExternalSurface instances can be treated as any other OdGeSurface. You can access the OdGeExternalSurface as a corresponding native OdGeSurface, if such a corresponding surface exists, or you may (more efficiently) access the external data in its native form. One example of using OdGeExternalSurface is to access an ACIS surface.

Reference