Highly customizable Outline Post Process material with adjustable line thickness by view distance, lines color, custom depth pass, depth lines and normal lines selector, high quality pass for depth lines.
UE4 Marketplace: http://bit.ly/UE4OutlinePostProcess
Overview video: https://www.youtube.com/watch?v=k0D9ZSzOKkI
Number of Unique Materials and Material Instances: 1 + 6 instance
Supports only deferred shading