uh so... ways to find the midpoint/point on plane of coordinates EFGH in 3dspace? Like...
since it is a quad, usually it is split to tris? i can only find https://math.stackexchange.com/questions/1989359/is-there-an-easy-way-to-determine-a-point-from-its-barycentric-coordinates-geome and it seems kinda crude and unstable