请教空心球可如何划分网格？

请教空心球可如何划分网格？我是先画一圆环，划分好网格，然后利用延伸中的旋转来实现VROTATE，但是得到的球只是几何体，没有网格，为什么？
下面是我的命令：
/PREP7
LOCAL,11,1,,0.0002,,-90
ET,2,MESH200
ET,1,SOLID45
KEYOPT,2,1,6
MP,DENS,1,7930
MP,EX,1,1.93e11
MP,NUXY,1,0.31
k,2,0.00017
k,3,0.00017,90
k,4,0.0002
k,5,0.0002,90
L,3,5
L,2,4
L,3,2
L,5,4
TYPE,2
MAT,1
CSYS,0
LESIZE,3,,,15
LESIZE,4,,,15
LESIZE,1,,,3
LESIZE,2,,,3
ESIZE,0.00002
AL,2,4,1,3
MSHKEY,1
MSHAPE,0,2D
AMESH,1
k,101,0,0,0
k,102,0,0.0003,0
L,101,102
VROTAT,1,,,,,,101,102,360,4