Cylindrical Helix Class

System Object
Autodesk.Revit.DB APIObject
Autodesk.Revit.DB GeometryObject
Autodesk.Revit.DB Curve
Autodesk.Revit.DB CylindricalHelix

	Name	Description
	ApproximateLength	The approximate length of the curve. (Inherited from Curve )
	BasePoint	The base point of the axis of the cylindrical helix.
	GraphicsStyleId	The ElementId of the GeometryObject's GraphicsStyle (Inherited from GeometryObject )
	Height	Height of the cylindrical helix.
	Id	A unique integer identifying the GeometryObject in its associated non view-specific GeometryElement. (Inherited from GeometryObject )
	IsBound	Describes whether the parameter of the curve is restricted to a particular interval. (Inherited from Curve )
	IsClosed	Describes whether the curve is closed. (Inherited from Curve )
	IsCyclic	The boolean value that indicates whether this curve is cyclic. (Inherited from Curve )
	IsElementGeometry	Indicates whether this geometry is obtained directly from an Element. (Inherited from GeometryObject )
	IsReadOnly	Identifies if the object is read-only or modifiable. (Inherited from APIObject )
	IsRightHanded	True if the helix is right handed, false if the helix is left handed.
	Length	The exact length of the curve. (Inherited from Curve )
	Period	The period of this curve. (Inherited from Curve )
	Pitch	The pitch of the cylindrical helix.
	Radius	The radius of the cylindrical helix.
	Reference	Returns a stable reference to the curve. (Inherited from Curve )
	Visibility	The visibility. (Inherited from GeometryObject )
	XVector	The X direction vector.
	YVector	The Y direction vector.
	ZVector	The Z direction vector, which is same as the axis direction vector.

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	Name	Description
	Clone	Returns a copy of this curve. (Inherited from Curve )
	ComputeClosestPoints	(Inherited from Curve )
	ComputeDerivatives	Returns the vectors describing the curve at the specified parameter. (Inherited from Curve )
	ComputeNormalizedParameter	Computes the normalized curve parameter from the raw parameter. (Inherited from Curve )
	ComputeRawParameter	Computes the raw parameter from the normalized parameter. (Inherited from Curve )
	Create	Create a cylindrical helix.
	CreateOffset	Creates a new curve that is an offset of the existing curve. (Inherited from Curve )
	CreateReversed	Creates a new curve with the opposite orientation of the existing curve. (Inherited from Curve )
	CreateTransformed	Crates a new instance of a curve as a transformation of this curve. (Inherited from Curve )
	Dispose	Causes the object to release immediately any resources it may be utilizing. (Inherited from APIObject )
	Distance	Returns the shortest distance from the specified point to this curve. (Inherited from Curve )
	Equals	Determines whether the specified Object is equal to the current Object . (Inherited from GeometryObject )
	Evaluate	Evaluates and returns the point that matches a parameter along the curve. (Inherited from Curve )
	GetEndParameter	Returns the raw parameter value at the start or end of this curve. (Inherited from Curve )
	GetEndPoint	Returns the 3D point at the start or end of this curve. (Inherited from Curve )
	GetEndPointReference	Returns a stable reference to the start point or the end point of the curve. (Inherited from Curve )
	GetHashCode	Gets the integer value of the geometry object as hash code (Inherited from GeometryObject )
	GetType	Gets the Type of the current instance. (Inherited from Object )
	Intersect(Curve)	Obsolete. Calculates the intersection of this curve with the specified curve. (Inherited from Curve )
	Intersect(Curve, CurveIntersectResultOption)	Calculates the intersection of this curve with the specified curve. (Inherited from Curve )
	Intersect(Curve, IntersectionResultArray )	Obsolete. Calculates the intersection of this curve with the specified curve and returns the intersection results. (Inherited from Curve )
	IsInside(Double)	Indicates whether the specified parameter value is within this curve's bounds. (Inherited from Curve )
	IsInside(Double, Int32 )	Indicates whether the specified parameter value is within this curve's bounds and outputs the end index. (Inherited from Curve )
	MakeBound	Changes the bounds of this curve to the specified values. (Inherited from Curve )
	MakeUnbound	Makes this curve unbound. (Inherited from Curve )
	Project	Projects the specified point on this curve. (Inherited from Curve )
	SetGraphicsStyleId	Sets the graphics style id for this curve. (Inherited from Curve )
	Tessellate	Valid only if the curve is bound. Returns a polyline approximation to the curve. (Inherited from Curve )
	ToString	Returns a string that represents the current object. (Inherited from Object )

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The helix winds around a cylinder making constant angle with the axis of the cylinder. In this release, CylindricalHelix curves are used only in specific applications in stairs and railings, and should not be used or encountered when accessing curves of other Revit elements and geometry.

Reference