Yeah, many of those no longer work. The CAP for Standard Waiver doesn't work. I'm sure they COULD work with some tweaking, but I was asking for a simple explanation of the basic concepts or maths, so that I could know how exactly to do that.
EDIT: Game Maker uses a function called d3d_set_projection in their scripting language to contribute to this effect. I've done some research on this and it looks like changing projection matrices would be a great way to get this effect, is this something that could possibly be created as a System action or plugin or something, since projection matrix transformation is a feature of Direct3d?