Tibia is a 2d game, but it's sprites are drawn using certain kind of orthographic projection that is not the same I'm used to:
I'm trying to figure out what projection is used here. I've guessed the following:
project(x,y,z) = (x-z/sqrt(2), y-z/sqrt(2))
It produces a circle very similar to that wheel, and alright cubes, but the spheres are not projected as perfect circles like the globe and the crystal ball on the picture above.
So which is the actual projection that game is using?