somemさんのブログ等で傘の話がありましたので
Script!3D で作ってみました。
(ちょっと時間が掛かってしまいました・・・)
// 傘
#VAR
 kcol = 1  ;*傘の線色
 scol = 7  ;*支柱の線色
 ecol = 5  ;*柄の線色
 kh = 300  ;*傘高さ
 kr = 500  ;*傘半径
 kn = 8   ;*角数
 krx = 20  ;*krx
 krz = 30  ;*krz
 ss = 100  ;*先端部長さ
 sl = 800  ;*支柱長さ
 sr = 5   ;*支柱半径
 el = 100  ;*柄長さ
 er = 10  ;*柄半径
 er2 = 40  ;*柄外半径

 i
 i1
 j
 khx
 khz
 khr
 khsa
 khea
 ka
 krd
 krxx
 krzz
 krr
 kx
 ky
 x1
 y1
 z1
 x2
 y2
 z2
 x3
 y3
 z3
 wx1
 wy1
 wr1
 wsa1
 wea1
 wx2
 wz2
 wr2
 wsa2
 wea2
 a1
 a2
 a3
 a4
 wx3
 wy3
 wz3

#DRAW
 LAYER 0
 PEN kcol
 CAL x1 = kr
 CAL z1 = 0
 CAL x2 = 0
 CAL z2 = kh
 CAL x3 =-kr
 CAL z3 = 0
 GET3PA i,j,khx,khz,khr,khsa,khea, x1,z1,x2,z2,x3,z3
 CAL khea = khea / 2
 //
 CAL ka = 2.0*PI / kn
 CAL krd = kr
 CAL krxx = krx
 CAL krzz = krz
 CAL krr = kr
 CAL i1 = 0
 #WHILE (i1 < (SetArcSep-1))
  CAL kx = krd*Sin(ka/2)
  CAL ky = krd*Cos(ka/2)
  CAL x1 = kx
  CAL y1 =-ky
  CAL x2 = 0
  CAL y2 =-ky + krxx
  CAL x3 =-kx
  CAL y3 =-ky
  GET3PA i,j,wx1,wy1,wr1,wsa1,wea1, x1,y1,x2,y2,x3,y3
  // ARC2D i,SetArcSep, wx1,wy1,wr1,wsa1,wea1
  //
  CAL x1 =-kx
  CAL z1 = 0
  CAL x2 = 0
  CAL z2 =-krzz
  CAL x3 = kx
  CAL z3 = 0
  GET3PA i,j,wx2,wz2,wr2,wsa2,wea2, x1,z1,x2,z2,x3,z3
  //
  CAL z3 = Sqrt(khr*khr - krr*krr) + khz
  //
  CAL a1 = (wea1 - wsa1)/SetArcSep
  CAL a2 = wsa1
  CAL a3 =-(wea2 - wsa2)/SetArcSep
  CAL a4 = wea2
  CAL x1 = wx1 + wr1*Cos(a2)
  CAL y1 = wy1 + wr1*Sin(a2)
  CAL z1 = wz2 + wr2*Sin(a4) + z3
  CAL wx3 = x1
  CAL wy3 = y1
  CAL wz3 = z1
  CAL i = 0
  #WHILE (i < SetArcSep)
   CAL a2 = a2 + a1
   CAL a4 = a4 + a3
   CAL x2 = wx1 + wr1*Cos(a2)
   CAL y2 = wy1 + wr1*Sin(a2)
   CAL z2 = wz2 + wr2*Sin(a4) + z3
   LINE3D j,x1,y1,z1, x2,y2,z2
   CAL x1 = x2
   CAL y1 = y2
   CAL z1 = z2
   CAL i = i + 1
  #END
  //
  RENCLR
  RENSET
  RLSEL1 j,-1,-1,0, wx3,wy3,wz3,0.001,1,1,999,999
  #IF (i1 > 0)
   R_RULED 0,-1,-1,1
  #END
  //
  CAL krd = krd - kr/SetArcSep
  CAL krxx = krxx - krx/SetArcSep
  CAL krzz = krzz - krz/SetArcSep
  CAL krr = krr - kr/SetArcSep
  CAL i1 = i1 + 1
 #END
 S_PICK3 0,-1,-1, 0,0,kh

 // 線を消す
 ALLSEL j, 1,1,999,999
 S_DELE

 // コピー
 ALLSEL j, 1,6,999,999
 CAL a1 = 2.0*PI *(kn-1)/kn
 CAL i = kn-1
 S_COPRS 0,-1,-1,i, 0,0,0, 0,0,0, 0,0,kh, 1,1,1, 0,a1,0

// ----- 支柱〜 -----
 PEN scol
 // 先端部
 CAL x1 = 0
 CAL y1 = 0
 CAL z1 = kh
 MATRIXO x1,y1,z1
 CAL z2 = sr/2
 CTUBE i,SetArcSep,sr,ss,z2,0,0,0,1,0
 // 支柱
 CAL z1 = kh - sl
 MATRIXO x1,y1,z1
 CYLIND i,SetArcSep,sr,sl,0,0,0
 // --- 柄 ---
 PEN ecol
 #IF (er > sr)
  DSLD2D i,SetArcSep,0,0,er,er,0,sr,0
 #ELSE
  #IF (er < sr)
   DSLD2D i,SetArcSep,0,0,sr,sr,0,er,0
  #END
 #END
 #IF (el > er2)
  CAL z1 = -(el - er2)
  MATRIXL x1,y1,z1
  CAL z1 = el - er2
  CYLIND i,SetArcSep,er,z1,0,0,0
 #END
 LAYER 1
 CSLD2D i,SetArcSep,0,0,er,er,0,1
 ALLSEL j, 1,999,1,999
 CAL x1 = er2 - er
 CAL y1 = 0
 CAL z1 = kh - sl - el + er2
 CAL x2 = x1
 CAL y2 = 10
 CAL z2 = z1
 CAL a1 =-PI
 S_ROT1 2,0,-1,SetArcSep, x1,y1,z1,x2,y2,z2,a1
 S_DELE
 LAYER 0
 CAL x1 = er2*2 - er*2
 CAL y1 = 0
 CAL z1 = 0
 MATRIXL x1,y1,z1
 CAL j = Int(SetArcSep/2)
 DOME i,j,er,0,0
実行しますと
20090708a
という感じで、スケッチアップに送信して
20090708d
先端部の円に線があるのを消して、ソフトニング。支柱と柄の部分は少し粗いので別個に再度ソフトニング。
20090708e
こんな感じかなぁ?