Hi NightCabbage,

> When I move or change the circles, the shape changes, too.

Yup, there you are seeing "construction history" in action - when you did the loft, the result surface remembers that it was built by a loft between those 2 input curves, and later on if those curves change the loft is recalculated.

You can disable that update if you want by selecting the Loft result and going to Edit / History / Disable update.


> So my question is this...
>
> Am I supposed to keep the circles after I've used them to make my shape?
>
> Or should I delete them?

Well, it depends on what you are planning to do.

If you think you're going to tweak the shape later on, then you would probably want to just hide them rather than delete them.

It does tend to be good to at least hide them to get them out of the way so that they don't interfere with things like selecting edges.

But the construction history function is limited in several ways, currently once you do something like a boolean or trim of the surface, the history will not be connected up anymore. So you may want to do something like apply your tweaks to those curves soon after you created the Loft and then delete them.

- Michael