i have the book introducing character animation with blender.
the book is so helpful,but in chapter two:working with meshes;doing medeling a human head with extrusion medeling page 32-48(using vertices to trace a photograph with a mirror,am not sure what i did wrong but when i come to the part telling me to go under add modifier and select subsurf,when i do that all i get is all the vertices i traced around the photo graph is just softer.no sharp edges.it doesnt fill the lines(vertices)with sides.its just plane lines.no mesh nothing.what am i doing wrong.
please help thanx. 