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\section{\label{surfaceobject}Surface Object}
In the library both B-spline and NURBS surfaces are stored in a struct SISLSurf containing
the following:
\input{type/SISLSurf}
When using a surface, do not declare a Surface but a pointer to a Surface,
and initialize it to point to NULL. Then you may use the
dynamic allocation functions newSurface and freeSurface, which are described below,
to create and delete surfaces.
There are two ways to pass coefficient and knot arrays
to newSurf.
By setting $icopy=1$, newSurf
allocates new arrays and copies the given ones.
But by setting $icopy=0$ or 2, newSurf simply points
to the given arrays. Therefore it is IMPORTANT that the
given arrays have been allocated in free memory beforehand.
\pgsbreak
\input{func/newSurf}
\pgsbreak
\input{func/copySurface}
\pgsbreak
\input{func/freeSurf}
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