extern double    (*objint[])();
extern int       (*objnrm[])();
extern int       nlight, lightlim;
extern t_light   light[];
extern int       nobject, objectlim;
extern t_object  object[];
extern int       nsurface, surfacelim;
extern t_surface surface[];
extern int       sizex, sizey;
extern t_3d      eyep, lookp, up;
extern double    hfov, vfov;
extern int       level, maxlevel;
extern char      outfilename[];
extern t_color   background;