  Matrix weighted rational B\'{e}zier curves can represent complex curve shapes
using small numbers of control points and clear geometric definitions of matrix
weights. Explicit formulae are derived to convert matrix weighted rational
B\'{e}zier curves in 2D or 3D space to rational B\'{e}zier curves. A method for
computing the convex hulls of matrix weighted rational B\'{e}zier curves is
given as a conjecture.
