I believe I understand now. I had, of course, noticed that when a model is saved after being subdivided it could no longer be reduced back to the original primitive after reloading the file. In effect, the subdivision having been commited by the saving. Do I have that right?
What I really didn't understand was the point of setting subdivision levels in the objects property settings. And I was wondering if I was missing something important, some bit of knowledge that was passing me by.
All I'd been doing is modeling then subdividing then reducing the subdivision level and making changes until I was happy with the result. Then I'd simply save the model in the most primitive state I could unsubdivide it to without losing detail.
I guess I still don't understand why there is the facility to set subdivision levels in the properties. I'm still wondering if I'm missing something.
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