Do I have to use shared vertices in mesh in Unity?

Question

I want to create procedurally generated landscape meshes with a flat shaded look in Unity3D.

I thought it would be the best to create three unique vertices

Answer 1

There might be 2 considerations for using shared vertices:

• To reduce memory usage. (Only slightly, but if you need less UV1's, UV2's, normals, vertices it can add up)
• to make it more convenient to share normals. (You only have to alter one normal of a vertex if you want to keep the surface smooth. )

These are no big reasons, but as most of the meshes from other 3D programs that you encounter, it's probably best to get used to shared vertices.