Editing normals for a cylinder I have a cylinder completely smoothed like the following (the purple lines are the vertex normals):



My final goal is to reach the result below:



I'm using the Blender4Web Addons, but I can't still achieve the target. I can easily have the situation below:





The problem is creating the right angle for the vertex normals along the curve... How can it be done?
One way would be to copy the normal position, from a duplicate of the mesh, without rim faces. Like this: