last day i was modeling a car. i started from front. i designed front portion thn i designed side seperately and later on i combined both meshes. but when i combined the meshes it give a hard seam from where i merged the vertices. i tried deleting history but no use. i again modeled the side mesh but again when i combine mesh and merge vertices hard seam comes there.
Same thing happen when i was modeling a face i modeled eye portion seperately and then i designed nose but when i combined meshes and merge vertices a hard seam comes.
please tell me the solution to get rid of this hard seam.