BezierFunction[...][u] gives the point on a Bézier curve corresponding to parameter u.
BezierFunction[...][u, v, ...] gives the point on a general Bézier manifold corresponding to the parameters u, v, ....
The embedding dimension for the curve represented by BezierFunction is given by the length of the lists .
BezierFunction[array] can handle arrays of any depth, representing manifolds of any dimension.
The dimension of the manifold represented by BezierFunction[array] is given by TensorRank[array]-1. The lengths of the lists that occur at the lowest level in array define the embedding dimension.
The parameters u, v, ... by default run from 0 to 1 over the domain of the curve or other manifold.