Verticality and flanking

[Colette Brunel]

Just like in Pathfinder 1e, the rules for vertical flanking are vague. Does flanking care about verticality and "center of cubes" at all? If two Huge creatures are on opposite sides of a Medium creature, do they fail to flank just because the centers of their cubes fail to cross the Medium creature's cube?

[PsychicPixel]

So, Pathfinder has always had an issue with 3D things. Technically you cant angle a burning hands because it hits the squares in front of you but why wouldn't you be able to point it towards the sky to catch the top half of the large creature and not your party standing in front of you.

It's another one of those things that's up to GM discretion.

In your example, though at the least for flanking, they do have flanking because they are on opposite sides of the medium creatures square. Which is all flanking requires. It doesn't require center to center or anything like that just to be on opposite sides or corners of the target.

[Colette Brunel]

PsychicPixel, flanking traces from center to center, as per page 313. That is why I am confused: if two Huge creatures are standing on the ground, sandwiching a Medium creature, then the three-dimensional center of the Huge creatures' spaces never even touches the Medium creature's cube.

[Edge93]

And their statement addressed that, asserting that the rules for cover refer solely to the two dimensional spaces of player with no regard to 3-D space, it ostensibly simply doesn't matter.

Between those rules and applying the barest blink of logic it is quite clear that, for the given example at least, huge creatures can in fact flank medium ones. Most other situations of this sort would fall to the same umbrella.