Is it possible to render outlines in BI/Cycles using this technique for the BGE? - Blender Stack Exchange
GameEngine Blender-Material/GLSL Shader Document.
Upbge 0.2.5 - "GLOW BEHIND"+ "Attachment outline" shader - Game Engine Resources - Blender Artists Community
Blender Game Engine - GLSL Electricity Shader - YouTube
toon 2D FIlter - Game Engine Support and Discussion - Blender Artists Community
Crafting a Cel-Shaded Game-Ready Scene in UE4
How to create an outline shader that puts outlines on every edge of the object, rather than on the outside edges? Here's what I have vs what I want to have. :