`Example of shortening a hull.

read tanker.gf `Optional read -- copies tanker.gf to working dir.

mc tanker.gf (hull\hull.c) hullonly.gf /newgf /nowait

read hullonly.gf

enter pm

create hull\slicer1.c
ends -60 200  `Cut at 60 fwd
top 50
bot -50
out 50
/
create hull\slicer2.c
ends -40 -200 `Cut at 40 fwd
top 50
bot -50
out 50
/
create hull\fwd.c
shape hull.c
fit slicer1.c
/
modify hull.c
fit slicer2.c
/
modify fwd.c
vector 20 0 0  `This is the actual amount of the shortening
join hull.c
/
delete slicer1.c
delete slicer2.c
write short.gf
quit pm
display