import rhinoscriptsyntax as rs
import random as ran

# Delete all objects and start from scratch
rs.DeleteObjects(rs.AllObjects())

bsize = 10                  #side length of box 
dist = 20                    # distance between boxes
offs = bsize + dist         # offset of boxes
num = 35                # number of boxes in one row

# create a box 
corners = [(0,0,0), (bsize,0,0), (bsize,bsize,0), (0,bsize,0),
            (0,0,bsize), (bsize,0,bsize), (bsize, bsize, bsize), (0,bsize,bsize)]

rs.EnableRedraw(False)

for i in range(num):
    for j in range(num):
        for p in range(num):
            myran = ran.randint(0,9)
            if (myran >= 8):
                if ((i+j+p)%3) and ((i+j-p)%4):
                     box = rs.AddBox(corners)
                     rs.MoveObject(box, (i*offs,j*offs,p*offs))
            else:
                box = rs.AddBox(corners)
                rs.MoveObject(box, (i*offs,j*offs,p*offs))


rs.EnableRedraw(True)