#configure hulls
    for x in range(0,size[0]):
     for y in range(0,size[1]):
      for z in range(0,size[2]):
        #count neighbours of corners
        if(data[x][y][z]["type"]=="hull"):
            griddata=[]
            data[x][y][z].update(grid=griddata)
            #loop over corners
            for i in range(2):
             for j in range(2):
              for k in range(2):
                neighbours=0
                #loop over corner neighbours
                for l in range(-1,1):
                 for m in range(-1,1):
                  for n in range(-1,1):
                   if(data[x+l+i][y+m+j][z+n+k]["type"]=="hull")
                if neighbours>3: griddata.append("hull")
                else: griddata.append(None)
            print(griddata)