which are used as scalars to multiply sequences of control points to create
a parametric curve. Furthermore, these terms sum to unity, therefore they
are also another form of barycentric coordinates. The only difference between
these terms and the others described above is that they are controlled by a
common parameter t. Another property of B´ezier curves and patches is that
they are constrained within the convex hull formed by the control points,
which is also a property of barycentric coordinates.