This video tutorial goes through the steps to creating a custom cel shaded display mode in Rhino 8. The key steps in this video can be found below:
00:00 - Introduction
00:20 - Recolouring the layers
01:10 - Setting the scene lighting to give a strong shadow
02:30 - Creating a new custom display mode
03:58 - Creating a flat colour display
05:40 - Setting up the lighting
06:30 - Shadow settings
08:10 - Adding specific linework