A horror movie pulsating effect with post process materials

Welcome back to another recipe on post processing effects! I'm quite excited about this one, as we are about to start creating our own personal effects instead of using the ones we already have available through the engine. To do so, we'll take advantage of a particular type of shaders called the Post Process Materials that, to be honest, are quite self explanatory. They are the ones to be used when we need to adjust the scene as a whole. They are applied inside the post process volume, and not on a particular 3D model. Because of that, the way we create them is somewhat different to that of a standard material, so we'll be taking a look at how they are structured. This recipe will be the foundation which will let us create more complex effects later on, so let's jump right in!