Currently I'm creating a very low-poly model where there needs to be a high contrast between different Surfaces, so the normals of each surface must be equal to the perpendicular of the surface.
When I try to smart UV unwrap my model, without changing the model, no UV's are connected. If I want to create a nice unwrap with proper UV islands, I remove all vertex doubles and afterwards smart unwrap the model.
The problem with this method, is that now the normals are automatically smoothed, which destroys the preferred look of the model.
Is there a way to properly smart UV unwrap a model without removing the vertex doubles? Or might there be a way to get normals perpendicular to the surface after removing the doubles?