Very tricky method!
Adopted!



PS In fact i had make the same here in the past :) http://moiscript.weebly.com/subdivision.html
I don't know why i had use the OBJ of SKetchup ??? :D
SKetchup -->obj By Tig for free version of Sketchup
Import OBJ --> Moi by Max Smirnov
Export OBJ from Moi (Quad + Triangle) :) By Michael
Import OBJ --> Moi by Max Smirnov