So what I'm ultimately trying to do is calculate the length of a curve using a round-about method with an Array modifier on another object...

But what I'd like to be able to do is edit the curve while seeing that length update as I edit...

The only way I can fathom to do as such is with a driver on a Custom property for this field:
![](/pictures/user_upload/Tcll/K5UZUCTOO3UBICMQ.png)

But I'm not sure where exactly I'd need to do that, or with what...

Maybe a script could do it, but I'm not sure how :P