How to turn a line drawing into a scallop shell shape?

Rhino
1

I’ve been trying different approaches to turn this line drawing of a scallop shell into a 3 dimensional one that’s about 1.5mm thick. I keep running into roadblocks.

I would love to get a roadmap of how to do it. I don’t want it done for me, but I would dearly love a list of commands to use in order to make it happen. If there’s a parameter value on one of those commands that’s really important to use a hint would be great.

Or pointing me to a tutorial on how to get from where I am (2d line drawing) to a shape with similar curvy issues would be great!

Thanks!
scallop shell.3dm (356.8 KB)

2

your file was not uploaded correctly

3

Thanks! Fixed it!

4

how do you intend your shell to look like, like a real shell or simply extruded to 1.5 mm?

like so?

Bildschirmfoto 2021-09-29 um 19.29.36
Bildschirmfoto 2021-09-29 um 19.29.36868×446 40.4 KB

5

It needs to look like a real shell.

I did the extrusion and was able to get the extrusion (sort of) into the scallop shape via cageedit, but then I couldn’t figure out how to put a surface on it. Loft wouldn’t let me and Drape gave me absolutely crazy results that I didn’t expect.

6

OffsetSrf, cage edit would be my first guess either. after that you would have to model the indentations.

7

OffsetSrf? I don’t understand how that would help. It would make the “spines” you just extruded bigger, right?

8

Hello - I think the best bet is to use these curves as a guide to build new curves and surfaces from - most liklely SubD would be helpful here.

-Pascal

1 Like
9

as pascal mentioned, this is a great model for subd

check out the hand video for how to layout “paperdoll” topology

10

That’s wonderful!!! I think this video will get me where I need to be!