In Zbrush, if you import a geo that was previously subdivided multiple times, it can figure out the exact topology before the subdivisions. Is there something like that in Houdini?

-Olivier

You can give this a go, your success may vary

<strike>https://www.sidefx.com/forum/topic/68278/#post-291896 [www.sidefx.com]</strike>

Edit:
nevermind, it's been removed.

There is a paper on this that you can implement:
https://www.researchgate.net/publication/228968237_Reverse_Catmull-Clark_Subdivision [www.researchgate.net]