double brightness();
int    crossp();
double dotp();
int    endpic();
int    gammacorrect();
int    lightray();
int    linepic();
double normalize();
int    setup();
int    shade();
int    startpic();
int    viewing();
int    yyparse();

int    maksph();
double intsph();
int    nrmsph();
int    makbox();
double intbox();
int    nrmbox();
int    maktri();
double inttri();
int    nrmtri();
int    maksup();
double intsup();
int    nrmsup();