Thanks. It is done. But I find that Finishing

spliting and seperating

which all seperating parts

are the dependency

parts.And Need to

quit"edit model" to

"object model",then select

those parts and into "edit

model" and then select

edge and then "open

sesame". All the progress has more

steps. But click one door ,the

other is nondisplay.

While in maya,just need

creat cube then edit

mesh"split polygon

tool"then edit

mesh'detach component'

then'"open sesame".

Blender can also do the

same improvement,too.