Help with swirl design

[AndyNo_1]

Hi all,

I'm trying to create a bottle model that has a raised organic swirl that wraps around it as in the simple image attached.

bottle sample.jpg (50.05 KiB) Viewed 940 times

I tried modelling the bottle as a primative and then extruding but this results in a very clunky result as you can see in the screenshot

Any ideas on best workflow here? Obviously my thoughts are completely wrong

Thanks!

[Matt Sederberg]

Hi,

The trick is to have isocurves flowing along the direction of the swirl. I tried one approach: run the Rhino Spiral command, rebuild the curve to (I think) 42 points (nothing magic about that number, you just want to rebuild to a smaller number of points than you had originally), run the Rhino ExtrudeCrv command, convert to T-Splines, insert a few edges (exact) to get more geometry (alternatively you could have just rebuilt when it was a NURBS before converting to T-Splines), tsMerging the edges, extruding the end bits of the surface to avoid the concave corner problem, then just extruding a loop of faces.

Let me know if this helps!

Matt

[AndyNo_1]

Hi Matt,

This makes perfect sense, thank you! I was basically trying to model the bottle and then add the swirl but doing it the other way around makes life much easier

Many thanks,
Andy

[AndyNo_1]

Hmmm...Me again

I've been having much more success with the method above but as the design has become more rounded I'm struggling to maintain control over the swirl

The attached sums up what I'm looking to achieve. Basically a curved bottle with the swirl raised slightly - Eventually I'd like to adapt the swirl so it's not uniform the whole way, hence the need for T-splines

screenshot1.jpg (77.08 KiB) Viewed 881 times

Any ideas?

Thanks,
Andy

[Saskia]

Hi Andy,

if i understand your question/design the wright way, you want the swirl go around like a helix?

In this case i suggest "two" T-Splines (one for the bottle and one for the helix)
booleaned together at the end.

For the spiral I would use TS pipe command.
You can fix the line with Rhino commands to the surface of the bottle.

regards,
Saskia

[Saskia]

Hi Andy,

after sending the first post "i thought it over again"

The blue bottle is my first suggestion.
Then i tried with command (gold colour) by using the same lines, and received
a complete T-Splines model - it's not perfect (that's your part now ) but with patience you can sculpture your desired form.

The pink one is another modification from the gold colour.

regards,
Saskia

[knead]

첨부된 파일 속의 결과물이 원하시는 형태입니까?

[AndyNo_1]

Thanks for the extensive help as ever.

I was hoping I was missing something really simple but I think your suggestion of skinning it probably offers the most refinement options Saskia.

Adding a uniform swirl to a straight sided bottle is fairly straight forward but wrapping it around a curved form is still not exactly as I'd like. The image below is made from 2 parts as well. It's not perfect but will do me for now I think

Thanks again,
Andy

[knead]

당신이 첫번째 첨부했었던 이미지는 직각으로 꺽이는 형태입니다.
하지만, 두번째 첨부한 이미지는 매우 단순한 형태입니다.

그래서, 모델링의 접근 방식은 다소 차이가 있습니다.

어쨌든,
Command: _Helix + Command: _Loft + Command: _Intersect
또는
Command: _InterpcrvOnSrf
또는
Command: _CreateUVCrv + Command: _ApplyCrv
기타
Command: _FlowAlongSrf

을 사용하여, 원하는 형태에 조금 더 가까운 모델링을 시도해 볼 수 있을 거라고 생각합니다.