Hi Pilou, here is a variation from editing the curves as another example...

Possibly you might switch from Sweep to Network with some more guide curves if you want to more finely control the top surface.

- Michael

Hi Pilou, here's another variation where I used Rail revolve to build the top piece instead of sweep.




That may make for a somewhat more even height where the pieces intersect:



But you can see it's the same basic strategy - a couple of primary sheets are modeled, they are intersected and then filleted.

- Michael

Or if you want more uniform, this is just a totally flat top, so just a sweep around the sides followed by Construct/Planar to fill in the top and bottom planes:



- Michael

Here the file ;)
Blue = original
I don't put the "base" at the middle as you, does make difference for the sweep?

Hi Pilou - your top sweep surface is different because the curves you have there are made up of 2 segments joined together. Mine makes a single surface because each curve is only made up of one segment instead of 2 joined pieces.

Try deleting the middle point where your segments touch each other to fuse them into one segment which will then make one surface for the final result.

To see the difference more clearly, run Edit/Separate on your curves, and run Edit/Separate on the curves in my example - notice how yours breaks down into 2 pieces, while running Separate on mine does not make any separate pieces?

- Michael

Yes it's that I made it by Mirror ;)
Yes yours don't make separated pieces! That's magic!

So must be one curve ( the trick I missed) and draw it by helpline for have the oposite mirror points?
Or mirror it and redraw over them?
(ah separate, select points, join, kill works :)

Hi Pilou,

> and draw it by helpline for have the oposite mirror points?

This was how I drew my version, by dragging out construction lines from the centerline so that I had end point snaps on either side of it.

But yes doing a mirror + join + delete control point where the segments touch will also work.

In the future I want to add a "symmetry draw" function to make it easier to draw single segment curves like this with only needing to draw the points on one half.

- Michael

Symmetry Draw I LOVE IT!!! :-D

-Will

Hi Will,

> Symmetry Draw I LOVE IT!!!

Yeah, I think it will be a big help, even if it is just for drawing curves only at first.

It's one of the things that I hope to get done in v3.

- Michael

Sorry for my late reply, but I was not at the computer ... and the time to understand the explanations :-)

So thanks a lot for your answers.

I saw your model in your first file but it was not exactly than I would like when I try this :-)
For the rest, Pilou said everything for me :-)
I try this.