Hi Mala, are you trying to do that ? In that case, i have first select the 4 half circle and join them. Then the 4 lines to make the rails and join them. Then, sweep the 3 profil curves with the 2 rails. Then boolean diff the donut with two curves and delete the part you don't want.

Other method
Copy Move parts wanted to change
Separate
Hidden Function: ShrinkTrimmedSrf (Press Tab and write ShrinkTrimmedSrf )
Add pointsif necessary and move them as you want...

PS You can make the same directly on the ring! (so don't need to Move)
-just separate Up Down faces !
Here the separate move


Here directly on the ring!
Select All Separate
Select the 4 little parts
Show Points
ShrinkTrimmedSrf
etc

Thank you both...
More natural for me is french pilous way...
I want do it directly on the ring.
What does it mean: "Select all separate - select 4 little parts"
And..."Show Points" does not work for the other parts in my model. Neither the ring nor the two trimmed splines. Only at circle spline I made the sweep with.
Mala

Load your File

Select All the ring then Separate! ;)

Cick on the empty Space for Deselect

Select the 4 curvated Surfaces(by clicking one by one) wanted to deform

At the end of this 4 selection "Show Points"

You must have all ring "Show Pointed" + 4 Surfaces "Pointed" enlighted

Press Tab & Write SchrinkTrimmedSrf

You must have only 4 surfaces Pointed!

If you have not enough Points just Add Points as you want (always on these 4 surfaces)

Have fun modeling!

PS

If you want all ring as "Show pointed" don't make the 4 Surfaces Selection and the SchrinkTrimmedSrf
then click a big Surface then move points etc...the 4 Surfaces must be separated again for moving points shown!

...hey...French...thanks a lot...but I guess I´m too silly for that operations! Hmmm´....
Mala

Why do you not select all points along the common "Line" ?
Like that you take points from each surface sides points on the same time! ;)

I am in the case of all points rings visible but that will be exactly the same in your case of 4 Surfaces! ;)
I hide the curve limit for more easy move & selection...

Hi Mala, how about this method:

Select your "bump profile" curve:



Use Construct > Extrude with "Cap ends" checkbox turned off to make this:



Next step is to delete or hide the curve used to extrude since it will interfere with selecting the edges there.

Then next select these edges:



And run Construct > Blend to make a blend surface like this:



Now delete the extrusion and mirror the blend surface and use Edit > Join to glue the pieces together:





Is that close to what you are trying to get?

- Michael

Hi Mala, or also what about a sweep using 3 profile curves all in the one sweep like this:





It isn't necessary to cut it, the way profile curves transform between each other means the bump shape will not have an effect on this region of the sweep:



- Michael

You have also Loft...
Copy move sections for more easy process... Join the 2 circular sections if they are half... Then Loft the 3 sections

Order of selection of the sections is very important!
Caps or not caps is possible, loose, straight style can be also asked depending of wanted resultat!



And of course at the end if you ask Show Points for the "middle section"
you will have Real Time deformation! ;)
Any selection of Points can be moved in any directions!

...I´m almost sure: people like me costs you helpers time of your live! B U T : Now I got the principles for that modeling. They are so simple that it not may be true. Sorry for my moi-skills, deeply. Where are you..in order to send tons of chocolate to you. (ok - better salad and vegetables...?!)

What I´m now working on is the finetuning of my splines....

How can I make it better and smooth? Is it handcraft and feeling-modelling? Or are there given rules to make the form fine? Or automatic refining tools in moi?


Last tips and impulses would be welcome...

Best regards, Mala

<<<Or are there given rules to make the form fine?

Just a Moment of Inspiration is sufficient! :)

How cool is it, it is not ? ;)

Your object is yet sufficient for some Flow fantasy!

Hi Lara,
I am sure that questions are welcome. The answers generated help many others.

Esthetics might favor tangent or G1 or G2 curvatures?

- Brian

Hi Mala,

re:
> How can I make it better and smooth? Is it handcraft and feeling-modelling? Or are there given rules
> to make the form fine? Or automatic refining tools in moi?

Hi Mala yes it will be a matter of adjusting the control points of the curves you used for constructing the shape. There aren't any tools currently for doing that automatically.

Localized bumpy details can be awkward to model with a CAD modeling toolset, the main focus in CAD surfacing is on making broadly smooth sheets and not really on fine local bumpy details.

Bumpy shapes and fine tuning bumps can be done better in a displacement brush based modeling system like 3D Coat or ZBrush. Those allow you to refine bumpy details using brush strokes directly on the surface.

- Michael

Hi,


Moi3D is not done to create bumped surfaces, but you have a possibility to do it with Moi3D with its plugins.
Here is a exemple of antic coin pendant and a memento mori coin.
I did a grayscale of the bump and use the plugin heightmap to create this in Moi3D.
The printed result is pretty good...

Smart, Frenchy, new inspirations in deed.
Little more light onto the small "nupsies"....
thanks, Mala

Thanks Phiro. Bump is not in focus at the moment, best regards... Mala

One more modeling thing: breaking the surface along line.
The car images are showing what I need to do...breaking the surface.
How do I do that? I tried some boolean operation to make a cut in the ring. Then my intention was it so lift the surface... But I failed. Which tool should I use?

Regards, Mala

a cool method by Chipp Walters! ;)

Else my method of moving points can also works very speedly! :)
And it's very interactive!