Hello, I'm working on my own shader to get a particular look for my project, everything so far has been rather straight forward but I've now hit a snag. I want to add the Occlusion mapping that the Standard shader provides for my own shader, but I have no idea how to do that. I tried digging into the Shaders source code for Unity 2017.4.28 (the version I'm using) but it's not at all what I expected. It's an extremely complex script that uses multiple includes across many scripts and I have no idea what I need to take from it to add AO to my shader. Can I get some help? Thanks.