What the hell is a 4D game? I just hate buzzwords.
If you instead fix a spatial coordinate you get images as the two left and center images in
> http://electronicimaging.spiedigitallibrary.org/data/Journal...
The parent said "A 2D slice of a 3D object."
And that's wrong, it's a 2D projection of a 3D object.
If you include time then it's a slice in the time component, right, but that wasn't being discussed.
Videos can also be generated without using projections (though cameras use this method).
A video is either {2,1,0}-D or {1,2,0}-D, depending on the mathematical sign convention you chose for your spacelike dimensions.
When people use a single number, they invariably mean spacelike dimensions, as null dimensions and multiple timelike dimensions tend to give people the screaming jibblies when they try to visualize them.