Highlighting interactive elements within our game

So far we've had the opportunity to work with various materials; some of them more traditional in nature, as seen in previous chapters, and some others more disruptive, as we are just starting to see. Continuing with the theme of the present section, adding interactivity and functionality to our real-time experiences, we'll now take a look at a different type of shader that can contribute to that goal. We are talking about the Post Process Material – a type of asset that taps into the post-processing pipeline that Unreal has in place, enabling us to create some very cool and interesting effects. We'll explore one such example in the following pages, and we'll use it to highlight interactive elements within our games and apps. Take a look at the following screenshot:

Getting ready

You'll soon find out that the material we are about to create relies heavily on custom math nodes and scripting, which means that there are not a lot of custom parts...