Blender Render Passes Compositing Problem

Hello. While trying to learn Blender a long time ago (6 months) I stumbled across a tutorial which shows how to use different render passes, and composite them to make the final image. I think it was a pdf file, and it was about compositing a door handle using many different passes.

I’ve been trying to find it ever since I learnt about the compositer. If anyone knows what im talking about, please provide a link for me, because from what i remember, it was a very good tutorial, easy to follow, and if anyone has it or knows where it’s from, it would be a great help.