  We illustrate the use of Oshima splines in producing high-quality \LaTeX\
output in two cases: first, the numerical computation of derivatives and
integrals, and second, the display of silhouettes and wireframe surfaces, using
the macros package KeTCindy. Both cases are of particular interest for college
and university teachers wanting to create handouts to be used by students, or
drawing figures for a research paper. When dealing with numerical computations,
KeTCindy can make a call to the CAS Maxima to check for accuracy; in the case
of surface graphics, it is particularly important to be able to detect
intersections of projected curves, and we show how to do it in a seamlessly
manner using Oshima splines in KeTCindy. A C compiler can be called in this
case to speed up computations.
