Almost, but not quite - you can move each vertex of a cube inwards on all 3 axes, e.g. treating each face as a 4-point heightmap. This would automatically extru

Almost, but not quite - you can move each vertex of a cube inwards on all 3 axes, e.g. treating each face as a 4-point heightmap. This would automatically extrude new cubes upwards, destroy ones you flatten to nothing, etc. which means it could absolutely work as an almost-typical heightmap, if you wanted it to.