This is a short tutorial on setting up and using vectors from both the camera vantage point and that of Lighting and other useful techniques.
https://dev.epicgames.com/community/learning/tutorials/OD2l/leveraging-directional-vectors-for-comic-shaders-in-unreal-engine
Superb !
The cross hatching shader graph image is too small to study.
It would be cool if you could have included some explanation in this article on the set-up. Or a link to another page explaining it in detail.
None the less very simple and informative tutorial.
Cheers,
b