Hi Olga,

The easiest way to cut the cone out of the ring top is to first make sure you're working with closed objects.

In your model, the end point of the construction curve on the side didn't connect to the ellipse on top, causing the
network surface to not conform to the curves, which would cause some problems connecting
the bezel surfaces to to the ring as a closed "leak-tight" model.

And as Burr mentioned, hiding the object in the way will let you pick the cone. But I guess old habits die hard.. :-)
I also capped the cone before I subtracted it from the ring, which is the way you'd have to do it in Rhino.


-Jesse

Hi Olga, also you may want to check out this recent message:
http://moi3d.com/forum/index.php?webtag=MOI&msg=1810.2

That has a short tutorial on another way to select objects that are inside of other ones by using the left-to-right window select, which only targets objects that are completely contained inside the selection window.

If things are getting in your way though, definitely hiding is a good way to deal with that problem.

Don't hesitate too much to hide things.

Also kind of a vaguely similar situation is if you are having difficulty targeting a particular point to snap on to, it is a good habit to get into to zoom in to make things easier on yourself rather than struggling with trying to work in an area that you can't clearly see.

- Michael