
int surface(float xmin,float xmax,
            float ymin,float ymax,
            float zmin,float zmax,
            int xminw,int xmaxw,int yminw,int ymaxw,
            int hmax,float **z,
            float horangle,float elangle,
            int nx,int ny,int box,
            int fillcolor,int edgecolor,int boxedgecol,
            void far csetfunc(int color),
            void far linefunc(int x1,int y1,int x2,int y2));


