assignment 01B-Shi Xinyu

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## Assignment 01
## Pof.Daniel da Rocha 
## Student.SHI Xinyu
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# logic
# 1) creste an initial square
# 2) find these two points (pocA & pocB) for rotate the square:
#   1) get current line
#  2) use pointOnCurve find the four points of the square
#  3) use the formula to find the pocA or pocB
#   1) if this is even number times, find pocA as rotation piont
#   2) if this is odd number times, find pocB as rotation piont
# 3) select the initail square
# 4) copy & rotate the square by pocA or pocB
# 5) select the last square and run this again

import maya.cmds as cmds

# creating initial square
mySquare = cmds.nurbsSquare(sl1=6,sl2=20)

def realRecursionOpt2(iterations):
 #select mySquare  
 cmds.select( cl=1 ) 
 cmds.select( mySquare )   
 mySquareNew = cmds.duplicate( mySquare )  
 
 sides = cmds.filterExpand( sm=9 )  
   
 #create a list to store the positions  
 positions = []  
 for i in range( len(sides)  ):  
     pos = cmds.pointPosition( sides[i] +".cv[0]" )  
     positions.append(pos)  
 print positions
 
 Xa = ((positions[1][0] + positions[2][0])/2 + positions[0][0])/2
 Ya = ((positions[1][1] + positions[2][1])/2 + positions[0][1])/2
 Za = ((positions[1][2] + positions[2][2])/2 + positions[0][2])/2
 
 Xb = ((positions[1][0] + positions[2][0])/2 + positions[3][0])/2
 Yb = ((positions[1][1] + positions[2][1])/2 + positions[3][1])/2
 Zb = ((positions[1][2] + positions[2][2])/2 + positions[3][2])/2
 
 if iterations/2 ==0:
  cmds.rotate( 0,0,30, pivot=(Xa, Ya, Za) )
 else:
  cmds.rotate( 0,0,30, pivot=(Xb, Yb, Zb) )
  
 mySquare = mySquareNew

 #recursion part
 if iterations ==0:
  return "Done"
 else:
  iterations -=1
  realRecursionOpt2(iterations)

realRecursionOpt2(1)