it's kind of the reverse of height map to normal..... from a direction you can deduce a plane and all the surrounding pixels will be on that plane ie if a normal points 45 deg to the right the pixel to the left will be above (in height) and the pixel to the right below (in height) and the pixel above and below will be on…
i'd guess probably substance designer? that being said, say you have a sculpted highpoly naked body, bake a normalmap and convert that back to a heightmap it will surely not give you the same result as a heightmap baked from the highpoly.normalmaps have no information about distances to the original surface, they just have…