How to Change Object Shading in Unity

Quick summary

1. Import Poison_Pot or any other mesh to Unity.
2. Select your mesh in the Project tab:

3. In the Inspector - Model tab, you will see an option called Normals, change it to Calculate:

4. Set Smoothing Angle to 0 and press Apply:

All of the mesh edges became Sharp (flat shaded):

5. If you will set Smoothing Angle to 180 – all of the edges will be Smooth (smooth shaded):

Using Smoothing Angle we can control which edges will be Smooth and which will be Sharp.

Smoothing Angle – maximum angle between Face Normals that will be considered as Smooth:

For example, if we set Smoothing Angle to 60 – all of the Faces that are at a 60-degree angle or less, now are Smooth (smooth shaded).

And Faces that are at a 61-degree angle or more, are Sharp (flat shaded).

Here is the same Poison_Pot with a Smooth Angle set to 60:

You can see that at the top those sharp 90-degree angle faces are flat shaded and the rest of the mesh is smooth shaded.