 where `n' is between 1 and `room' inclusive. The returned
                vertices are arranged in order of increasing vertex ID.
                The IDs of the returned vertices range from

                    start

                to

                    start + n - 1


                [3,n] = size(vrtces); double = class(vrtces)

                Each vertex is a 3-vector. The correspondence of elements
                of `vrtces' with the elements of the set of vertices
                contained in the