Oh dear.
Legitimize I wish I knew what the answer was, I would use it myself if I did.

My father has never paid me the attention I wish he would. I tried my best to please him, make him notice me, make him take notice of me, approve of me. I tried ballet dancing lessons, and if you could see me you would know how ridiculous an idea that was! I went to bars, pubs, clubs and came home drunk, (NOT A GOOD IDEA - EVER!) I crashed his car and wrecked his greenhouse, (drove his car into his greenhouse) this was not one of my better ideas either. But apart from his genuine annoyance and anger he has never shown any noticable emotion over me.
In the end I had to admit defeat and live for me. Never an easy decision for a child to come to.
I moved out a few years ago and he didn't even notice I was gone until I went back for the Xmas holidays and he noticed there was one less place than usual these days for him to put his feet.
I love my dad, but I really think that life goes on around him mostly without him even noticing. He breaks his trance once a week to go to church on Sundays, but that's it.
I know this is of no help to you Legitimize. I know this is not your situation it is mine, but I wanted you to know that you are not the only person this kind of thing happens to. It also happened to me.
My post won't help you find a way to interact with your dad, but I hope it makes you feel less alone in this.
Hey it might not even help with that either, and I have just posted a load of my personal info for absolutely nothing, but I don't think we are the only people who have ever had parents who live around us and do not give us the credit we try so very hard most of our lives to deserve.
Good luck with your dad.