Ring with unusual shape

Rhino Rhino for Windows
1

Can anyone give me a hint how model twisted parts of the ring?

045.jpg719×701 66.4 KB

Van Cleef & Arpels.png808×802 199 KB

2

Create a “spine” curve for each part.

Place cross sections on each spine.

Sweep1

3

Can you say if I did something wrong?
Van Cleef & Arpels.3dm (298.2 KB)

4

Does it look like you want it to look?

5

What?

6

It appears to be okay. I don’t see any naked edges or other problems.

I was trying to ask if the appearance of the ring is as you want?

7

Thanks, David. I mean this part

Screenshot_1.png803×647 38.1 KB

8

Have a play around with ArrayCrvPLUS: http://jarek-rhinoscripts.blogspot.co.uk/2008/12/arraycrvplus-v20.html

You can create your ring with one main curve and a rectangle orientated perpendicular to one end. The rest will be taken care of in the script.

Andy

2 Likes
9

Are you just interested in approaches that use Rhino only?

10

Yes, I only use Rhino.

11

I assume you used Sweep1 with a rail curve and some rectangular cross-section curves. The shape in the area outlined by the red box would be due to the shape of the rail curve and the distribution fo the cross-section curves.

Can you post a file which includes the curves used to create the surfaces?

12

Van Cleef & Arpels.3dm (426.1 KB)

13

The most important thing is to work with clean and logical geometry - think ‘how can I create this’ rather than ‘what command will create this for me’ [apologies I didn’t see the hidden curves in the first file]

Take a look at the file: Van Cleef & Arpels - 2DCube.3dm (359.7 KB)

Again… Scroll up and install that plugin I suggested - it will make work like this much easier. I can see by your hidden geometry you have offsets for the profiles at different places - you can offset profiles within the ArrayCrvPLUS script and see the finished item as a sweep while you’re working on it (similar to history but with a little more control)

blob.jpg1058×788 65 KB

14

And here I think you get the best results using Kangaroo in Grasshopper to bend curves. For the bent curves you would then calculate offsets. You wouldn’t do all that for fun and it probably takes weeks or months to (learn and) set everything up. But at the end, I am pretty sure, you have a product better than the ring on the photo you uploaded…

1 Like
15

I would use curves from 2 views…draw it out flat and then the ring curve with this approach then sweep