C Scroll surfaces

Rhino Rhino for Windows
1

I’ve been using Rhino for 10 years and maybe I’ve not recovered from New Year of maybe I’m just plain stupid but I can’t create a solid or surfaces out of the two lines in the attached file. It looks so easy. Can anybody help? The images show the lines and a half-way-house lofted attempt.

John
C_Scroll_01.3dm (41.4 KB)

2

Hi John
Use the command Patch like the attache images
Ciao Vittorio
.

3

Hi John - I’d arrange the curves as in the attached file.

C_Scroll_01_PG.3dm (161.9 KB)

-Pascal

4

Thanks Vittorio, I tried patch and it doesn’t produce a surface of the right shape. As with yours the circular ends were too dished.

Pascal, dived the “front” surface into two - a sweep2 and a planar surface? I was trying to avoid 2 surfaces as that never seems quite right, but your result looks good. I’ll use that method.

Thanks,

John

5

Hi John- the way your original curves are set up, one hits the planar area ‘hard’ with a sharp corner, and one dips slightly behind then comes back to the planar area. I cleaned up the latter but left the hard intersection as this seemed to be part of the design. I would make that intersection planar as well, myself, and avoid that slight kink at where the scroll meets the flat.

-Pascal

6

Pascal, thanks, you’re right, I should have got the lines good before trying the surfaces. My excuse - it is just for illustration rather than manufacture. I’ll try it so that curves flow into each other better and see what that produces.

I have to say, I see some requests on this forum for some pretty esoteric stuff, I’d just like to see some advances in ease of creating surfaces and solids at a basic level. I’m not complaining - I’m not up to speed with v5 yet and the support is great - but to have defined an object with its four edges and still have to struggle to create the surfaces, or to have lofted it as in my image and not to have the option of capping it…Or are these things which aren’t practically achievable?

7

I made a video tutorial a while back about modeling a scroll that might help here too…

8

Thanks Brian, I’ve seen it before but on watching it again I find there’s some really useful tips in there which I hadn’t managed to remember.