+pnmoutline: pnmoutline.c
+ $(CC) -lnetpbm -o $@ $<
+
+data/sprites/ship.png: ship.pov pnmoutline Makefile
+ povray -GA -D +A +UA +W32 +H32 $< >/dev/null 2>/dev/null
+ pngtopnm ship.png >ship.pnm
+ ./pnmoutline <ship.pnm >data/sprites/ship.pnm
+ pnmtopng -transparent =white data/sprites/ship.pnm >$@
+ rm ship.png ship.pnm data/sprites/ship.pnm
+
+data/sprites/rock%.png: rocks.pov Makefile
+ povray -Irocks.pov -D +H52 +W52 +K`echo "$@" | grep -o '[0-9][0-9]'` +Fp -O$@.pnm
+ pnmcrop < $@.pnm > $@-c.pnm
+ pnmtopng -transparent black < $@-c.pnm > $@
+ rm $@.pnm $@-c.pnm
+