Trying to model a jacket collar?

[Anonymous]

So in real life, I've been given a piece of plastic that has been molded around a person's neck. As such, it is a simple object, but with an odd geometry to it which has been eluding my efforts to model it. I'm hoping someone might be able to give me some advice on how to recreate the form of this piece in Fusion?

The width and breadth of the shape taper towards the top at different rates. The sides of the piece are also higher than the center. Photos attached. Ive been trying for days, now, this **** simple little hoop of plastic has been one hell of a brain teaser.
Obviously I don't need the exact "scan" of this object, but to digitally create the form that it represents. Any ideas? Thanks!

https://drive.google.com/open?id=10hT6pfCTbJ6glB5hC9HLdrVGjFK_ZEGX

[chrisplyler]

I can't see what's under the tape. Is it something like this?

[Anonymous]

Possibly, although it'll end up being a bit more rounded. Under the tape  is where the plastic isn't formed correctly. I can't tell whether the rest is correct.

[Anonymous]

You should try patch modeling to make jacket collar, it will make it more convenient to model and will make it more easy to modify, try it

! 

[chrisplyler]

Sure, you could Patch/Surface it. I did not, and still it's fully controllable.

[Anonymous]

I admit, I'm only partially familiar with patch modeling, but that doesn't seem like it would solve my problem. I don't need to make something that looks like a shirt collar. I need to transpose dimensions based on this already existing piece into a model. 🙂

[Anonymous]

How'd you do it, Chris? Yours may be the right solution, but I really can't tell from a picture 😛

[chrisplyler]

It might not be the geometry you want. I can't really tell exactly from the pictures. My geometry is adjustable, but always results in a cylinder, or at least you can imagine that the shape was cut out of a cylinder. If you need variety on that particular situation, you're going to have to set it up a different way.

And I can't get it to fillet as is. So I consider it a fail. But still, you might learn something from it, adapting some of it's concepts into your own design. It would probably be easier to just Sweep a shape around a path and guide rail that you set up.

Anyway, here is my file, so you can open it, roll through the time line, examine each sketch and modeling operation in order.

[laughingcreek]

As @chrisplyler  says, it's hard to be sure what's going on from the picture.  But here are a few thoughts

-looking at the surface from the top edge to the bottom edge, is the front of the collar parallel or at an angle to the back of the collar?  It looks to me like the front tilts out (ie is at an angle), in which case you would need to create a cone-ish shaped surface to represent that angle, or use an "intersecting curves" projection.  My attached attempt uses an intersecting curves projection.

-is the cross section of the neck a circle, or an ellipse?  My neck is more ellipse shaped.  My attached attempt uses an ellipse, but a circle works also.

[chrisplyler]

Here is a version where I swept a slot around a path and a guide rail. It's pretty controllable. It might be more suitable to your needs, or at least give you ideas. File attached below the video.

https://knowledge.autodesk.com/community/screencast/5220c749-9545-4b6e-a18b-9e17d19098c2