the problem is that if the parts are different size on the direction axis, then it will get the wrong size.
local part1 = workspace.part1
local part2 = workspace.part2
local Direction = Vector3.new(0, 1, 0)
local DirectionValue = Direction.X + Direction.Y + Direction.Z
local InversedDirection = (Direction - Vector3.new(DirectionValue, DirectionValue, DirectionValue))
InversedDirection = Vector3.new(math.abs(InversedDirection.X), math.abs(InversedDirection.Y), math.abs(InversedDirection.Z))
local difference = part1.Position - part2.Position
part1.Size = difference + (part2.Size * InversedDirection)
part1.Position = part2.Position + (Direction * part2.Size/2) + (Direction * part1.Size/2)
same size:
different size:
