A 4D cross section is 3D, just like how the cross section of a 2D picture is 1D. It's just taking a point and a direction, and removing everything that isn't perpendicular to that direction at that point. So they just slice the 4D voxels into a 3D mesh and render that traditionally.Time
It's the same approach explained in this video.
. Games are technically already 4D. But is that's what's happening? They're merging two spaces into one?