Like vertex(), but this method returns vertices in reverse order if the
loop represents a polygon hole. For example, arguments 0, 1, 2 are
mapped to vertices n-1, n-2, n-3, where n == num_vertices(). This
ensures that the interior of the polygon is always to the left of the
vertex chain.
Like vertex(), but this method returns vertices in reverse order if the loop represents a polygon hole. For example, arguments 0, 1, 2 are mapped to vertices n-1, n-2, n-3, where n == num_vertices(). This ensures that the interior of the polygon is always to the left of the vertex chain.
REQUIRES: 0 <= i < 2 * num_vertices()