Bezier Class
BUILD NOTE: Only available in experimental builds 2017.30000+
The Bezier class holds a single Bezier primitive. It is an instance of a Prim Class. It can be created from either a Model SOP or Script SOP. Each curve is described by a set of segments, where each segment is a list of vertices. The first and last vertex of each segment is an anchor position, while its neighboring vertices describe tangent handles.
The members and methods below allow modification of the Bezier in a modelling context, however the Bezier can also be modified by direction manipulation of its vertices. See Prim Class for more details.
Members[edit]
order

The order of the curve. The order is one more than it's degree. 
closed

Control whether the curve is open (unconnected curve) or closed (solid closed face). 
basis

The basis as a list of float values. 
anchors

The list of anchor vertices. 
tangents

The tangents as a list of vertex pairs. 
segments

The list of segments, where each segment is a list of vertices. 
Methods[edit]
appendAnchor(targetPosition, preserveShape=True)
→ Vertex
 Appends a set of vertices, creating a new segment on the curve, ending with the targetPosition.
 Returns final anchor vertex.
targetPosition
 The final target position. The position argument can be any 3valued tuple.preserveShape
 (Keyword, Optional) Specifies whether or not the new tangent will align with the previous segment.
updateAnchor(anchorIndex, targetPosition, tangents=True)
→ Position
 Modify the anchor vertex to the new position.
 Returns resulting position.
anchorIndex
 The index of the anchor vertex to update.targetPosition
 The final target position. The position argument can be any 3valued tuple.tangents
 (Keyword, Optional) IfTrue
, modify neighboring tangent vertices as well.
updateTangent(tangentIndex, targetPosition, rotate=True, scale=True, rotateLock=True, scaleLock=True)
→ Position
 Modify the vertex vertex to the new position, constraining either rotation or scale.
 Returns resulting position.
tangentIndex
 The index of the tangent vertex to update.targetPosition
 The final target position. The position argument can be any 3valued tuple.rotate
 (Keyword, Optional) IfTrue
modify the tangent angle.scale
 (Keyword, Optional) IfTrue
modify the tangent length.rotateLock
 (Keyword, Optional) IfTrue
modify the matching tangent angle.scaleLock
 (Keyword, Optional) IfTrue
modify the matching tangent length.
deleteAnchor(anchorIndex)
 Deletes the anchor and its neighboring tangents.
anchorIndex
 The index of the anchor vertex to delete.
insertAnchor(u)
→ Vertex
 Inserts an anchor at the given position u.
 Returns resulting anchor vertex.
u
 The insertion point along the curve (from 0 to 1).