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[Goombert]

True, Harri, but what I find interesting, why you have to do the +1 with the other projection functions, it seems like you should be able to flip the upvector around to make it work.

[TheExDeus]

I guess you could. I didn't really test it (I forgot what the last 3 arguments did), so I just thought about it like a "point_to" function. So point from x,y,z to x,y,z+1, which just mean point in the positive z direction and that is just straight down (or the reverse, I can't even remember if the axis was in positive or negative z direction in OpenGL).

[Goombert]

I don't know, I was just doing the same thing the other day though when working on D3D9 sprites to see if I could do transforms on them to make them billboards. Direct3D and OpenGL though require the same transformation to an ortho projection to make it not be flipped upside down. I think that is dumb they should just do it by default, especially when the sprite and 2D transform functions work the correct way, eg. render targets and surfaces too.