How do I cut a 3D ring in half?

Very familiar with creating a sphere out of a semicircle. I know how to make a circular band. Can anyone tell me how to cut that band into a 3D segment? Grateful for any help.
Rob

I would do it like this:
Use 3D Extrude & Bevel on a stroked circle.
That way you can decide exactly where you want to cut the circle.
By the way, if you want the two pieces to fit together like this you must group them prior to extruding.

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I shot around 3 hrs of 1920x1080 AVCHD in 2 clips (a wide shot of the stage of a musical production I performed in) It all fits in the internal memory of my camera.
Two friends shot medium and closeups in Standard AVI with a view of making a DVD (2 disks)
They will be editing it in Premier Pro standard def.(a 3 camera production!)
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I would point out that Standard Def here in Australia(576) is 12% better vertical resolution that in USA(480).
So European & Aussie SD doesnt look quite so bad compared with full HD
In fact if you stand more than 4 metres from a 40" screen, most people cant see the difference between good SD and full HD.because the eye cant resolve such fine detail at that dustance even with perfect vision.
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I. downloaded trials of the following converters and rank them in the following order
1. 4Media version 6 AVCHD to AVI converter ($37)
2. Prism
3. AVS
4. Wondershare
5. PE9 making seperate SD projects
I found them obviously different with PE9 right at the bottom of the scale! I will never use it again to make a SD project.
Blurryness and jagged or twinkling diagonal lines were the most common faults.
4Media shone above all the others. When used on the highest bit rate was only slightly softer than the ACVHD material with no jagged diagonal lines but it produced an AVI file the same size as the AVCHD.
When I set the bit rate so the AVI file produced was half the original AVCHD, the quality was equal to original SD video Shot on my old Sony Camera that cost me $2000 5 years ago.
I can split the files with this program too!
Judging picture quality
All pictures will have errors and be less than ideal. It's just a matter of how many are acceptable.
The ONLY way to evaluate how good a picture is to view it on the best possible setup. You can't judge vertical resolution on an old CRT TV which is a different number of lines anyway (525 or 625) so evaluation is impossible. Digital TV thru a set top box to a CRT TV is far worse than the original analog.
Because everyone knows SD is worse then HD but it should only be half as bad (576 is about half of 1080)
Because I wear glasses that perfectly correct my focus and slight astigmatism, I have a good rough method of calibrating my eyes so I can relatively judge quality of different pictures on different systems.
I vary the difference between myself and the screen so the left and right edges are in line with my fingers inside the frames of my glasses!
This is equivalent to sitting two thirds from the screen in the average picture theatre where you can comfortably sit without being disturbed by deficiencies of most film and HD projection.
Applying this to my computer screen I can now judge pretty well. If a picture looks really good under these circumstamces it IS good and I can easily see any meaningfull errors.
Using my calibration "method", I found that full HD on my 40" LCD is noticeably sharper than the best cinema in our city (we have 39 of them, some with 8 theaters ) and after enquiries found they are all 1440x768 and not true HD at all.If you get there earlier than when they boot up their projector you can often see this in their boot up screen.
Worse still they slightly defocus them so you can see the pixel structure close up!
The now rare 35mm Film projection ranks even lower by the time copies are distributed.
You can't buy analog TVs or CRT screens anymore here anyway and Analog TV finishes here completely next year.

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Basel,
I'm not sure why these folks are having trouble understanding your request. I will dumb it down for them. Is there an option to have the iPhone only provide me with notifications when I'm not on the phone. Having my $800ish phone buzz and interrupt my phone conversation (after all primary function of this iPhone is being a phone) to let me know one of my Facebook friends has challenged me to a game of words with friends. I don't want my iPhone to not notify me at all. It can notify me after the call (again primary function) is complete. Going through menus and turning off notifications all together is absolutely silly. I wouldn't want to have to navigate through the menus and turn them off and then on an then off just to make or receive a phone call. Could you imagine answering you phone with, "hey, just wait I have to turn my notifications off so I can have this conversation." every time you wanted to talk on the phone.
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How do I cut a 3D ring in half?

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