I am trying to implement a 3d representation of a project I''m working on, and have run into some problems regarding vertices that are shared across faces. This is presumably because glDrawElements needs the indices in a certain way. Is it really not possible to have a single vertex with multiple normals (one per face the vertex is part of)? Some random google hits seemed to suggest this. How is it then best to proceed to add these duplicates to the vertex arrays? Does this have to be done "manually"? An answer would be greatly appreciated.