Michael,

> I confess to being a bit vague re the start n stop points, so it's probably user error again.

It can be important to be precise when you're constructing things, because you'll often want pieces to join up with one another. So be careful with just eyeballing things, it can cause problems later on if you're doing a more detailed construction.
------------------

In the interest of getting the info out here and my own understanding,
I meant a bit vague in comprehension, rather than execution. As an ex-draftsman, accuracy is ingrained. lol
Intuitively I expect to tell it what to revolve (selection) how far to revolve (degrees in text input) and what axis to revolve on. I'm not clear on how the start and stop points are used to define that axis, especially for the cases it seems designed for, where that axis isnt perpendicular or parallel to the active view window. I'd guess its related to the way an angle is defined but haven't explored enough for the penny to drop. I've successfuly used them to revolve by drawing two points on an axis but what I've inputted by the random distance I chose between them is anybody's guess.

I'm painfully aware of breaking the injunction to keep one's mouth shut and risk appearing stupid, rather than openning it and thus remove all doubt. However, its a good cause and at the least all the experienced nurbists get a good chuckle.

Cheers
Spinner

> As an ex-draftsman,

Ah, somehow I had jumped to an assumption that you were coming from a non-NURBS background because of using different modeling techniques such as the stuff called "subdivision surfaces". I shouldn't jump to assumptions about people's backgrounds so quickly.

It's actually quite valuable for me to find out about different things that you find confusing. Hearing about that stuff is how I learn what areas tend to confuse people and can help give ideas on how to improve things in the future.

So when you pick a revolve axis, the distance between the points you pick is not used for anything, the important parts are the location of the base point, and then the _direction_ that is formed between it and the second point. It would probably be better shown graphically as an infinite construction line instead of a line segment.

Think of the axis that you draw as a line that is the pivot pin of a door hinge, where the revolved shape will be created along the way the hinge swings. It doesn't matter if you have a one inch tall hinge, or a five inch tall hinge, they both make a swing in the same direction if they have the same pivot pin. Does that make sense? Let me know if that still doesn't make sense.

The distance you pick can be important to some operations, but not for revolve.

- Michael

Thats exactly how I used it, so a success for intuitive interface!

re ex-draftsman,
Nope, you were correct on the total lack of nurbs experience.
I hail from the dark ages, when draftsmen drew on paper with pen and ink, engineers used punch cards on big clunky mainframes and all the apples in the office were in lunch boxes. LOL
To a large degree, I'm a good test for Clueless meets MoI. So I'll keep posting and hope its of use.
Cheers
Spinner