you say
(Draw a polyline around the top half of the guitar shape, starting at about the neck.)
when your look at the image there is a bottom half and a top half.
the top of the image for the top half and the bottom of the image for bottom half
now if your saying shape, that would mean the top half is the left side of the image
and the bottom would be the right side of the image because the guitar shape is side ways,
the neck is the top which means the left side of the image
and the bottom would be the right side of the image.
it does make a different because im getting different results each way i try it
getting closer but stuck on this this word you say facets to tesselate?
i think im geting the right tesselate i tryed them all.
see attachment