$B0pMU$5$s$+$i!"(Jvax$B$G$O(Jbody/$B$,F0$+$J$$$H$N%l%]!<%H$rD:$-$^$7$?!#(J

> $B$=$l$G!$0J2<$N$h$&$J%F%9%H$r$7$?$H$3$m(Jbody/$B$,<:GT$9$k$3$H$,$o$+$j$^$7(J
> $B$?!%$3$l$O!$$=$A$i$G:n$i$l$?(Jeusgeo$B$G$b<:GT$7$F$$$^$9!%(J
> sun$B$G$O@.8y$7$F$$$k$h$&$G$9!%(Jsun$B$G(J#NaN$B$,$"$i$o$l$F$$$k$+$I$&$+$O(J
> $B%A%'%C%/$7$F$$$^$;$s!%(J

> eusgeo$   (setq c1 (make-cube 100 100 50))
> #<body #X167548 face=6 edge=12>
> eusgeo$   (setq pl1+ (instance plane :init (normalize-vector #f(0 1 0.4))
					     (float-vector 0 0 0)))
> #<plane #X1663e4>
> eusgeo$ (body/ c1 pl1+)
> Floating exception
> tansei<b39568> 

$B%(%i!<$O!"(JQUOTIENT$B$G5/$3$C$F$$$^$7$?!#$=$&!"(J0$B$K$h$k=|;;$G$9!#(J
$BF1$8=hM}$r(Jsun$B$G$d$C$F$bBg>fIW$J$N$O!"(Jsun$B$O(Jzero$B$K$h$k=|;;$r5v(J
$B$7$F$$$k$+$i$G$9!#$3$l$O$-$C$H(Jieee-floating-point$B$N;EMM$J$N(J
$B$@$H;W$$$^$9!#$D$^$j!"(Jsun$B$G$O!"(J
(/ 1.0 0.0) --> +Infinity
(/ 0.0 0.0) --> Nan
$B$K$J$j$^$9!#(Jvax$B$ON>J}$H$b(Jcore dump$B$7$^$9!#$3$l$O(Jvax$B$h$j(Jsun$B$N(J
$BJ}$,M%0L$G$9$M!#(Jdec$B$N(Jmips$B$r;H$C$?%o!<%/%9%F!<%7%g%s$OBg>fIW$J(J
$B$s$G$7$g$&$M!#$5$7Ev$?$C$F!"(Jgeopack.l$B$N(Jplane$B$N(J:intersection
$B%a%=%C%I$r!"(Jnpnn$B$N@dBPCM$,>.$5$$;~$O(J:parallel$B$rJV$9$h$&$K$7(J
$B$?$i(Jbody/$B$OF0$/$h$&$K$J$j$^$7$?!#$&$&$`!#$$$?$k$H$3$m$G(J
#-ieee-floating-point ...$B$H$$$&>r7o%j!<%I$r$$$l$F$*$+$J$1$l$P(J
$B$J$i$J$$$h$&$@!#(J

sun$B$,$$$$$H8@$C$F$b!"@0?t$O$I$A$i$b$d$C$Q$j(J
(/ 1 0)  --> core dump
$B$H$J$k$N$O$"$?$j$^$($G$9!#$3$N%7%0%J%k$rJa$^$($k$N$O$A$g$C$HLq(J
$B2p$G$9$M!#(Jsigseg$B$H$+(Jsigbus$B$H$+$b$=$&$G$9$,!"$3$l$i$O:F<B9T$G$-(J
$B$J$$%(%i!<$G$9$+$i$M!#(JEusLisp$B$G$O%7%0%J%k$rJa$^$($F$b$$$C$?$s$O(J
$B$J$7$F!"ET9g$N$$$$=hM}$N@Z$lL\(J(funcall$B$NA0$J$I(J)$B$G8!::$9$k$h$&$K(J
$B$7$F$^$9$+$i!#$I$s$J(JLisp$B$b$?$$$F$$$=$&$@$H;W$$$^$9!#(J

