Nodebundle for playing with nodes

 From:  speedy (AL2000)
7777.331 
Hi to all Friends
I continue with the exploration of the Minimal Surfaces
Trying to make it happen with Elepphant-
I want to share with you the result obtained
To realize the Schwartz-P Surf-
.... One of the main bricks .......
In that regard I wanted to ask Karsten
If there is any way to enter
"Preserve Edges" in the SubD .node
Have a nice day
al
link-http://www.mediafire.com/file/pqv8zigfpgvqcaf/Schwartz_P.rar