Hi BurrMan, when i do it the hard way, i offset the front and the rear faces edges by some value, then loft the two sets of curves. Is that clear ?

Ok, it's like extrude each 4 red faces to the center by some value, as if i could make some place for siding. In this case, the siding is 15 mm thickness.

Here is a better way to illustrate what i need.

Maybe like this ;)

But you must select (or extract) the 2 Lateral Sides edges for input them inside the Selected Nodes!
So 4 Clicks ( 2 for selection, 2 for input nodes) and read some little things about the Elephant nodes System by Max Smirnov... :)
https://moiscript.weebly.com/biblio-elephant.html
that can't maybe not a pleasure party! :)
https://moiscript.weebly.com/uploads/3/9/3/8/3938813/offset_lofts.nod

Hi jfs,
Havnt looked at the 3dm's yet as i'm on my phone, but from the description, you are looking for "inset" command.

But maybe you know this command and it's not working in this case?

I'll have to get a look at the file if nobody else chimes in soon.

Hi Paquicinno, probably that's what offset of a face selection ought to do but it isn't what it does currently. Currently for a face selection it separates out the selected faces same as using Edit > Separate and then offsets that separated piece.

Are the objects you want to process like this a cuboid type shape bounded by planar faces on all sides? If so I can probably cook up a script to do this.

- Michael

After seen your third file it's -15 that you must enter inside the Constant Node ! :)

So what will be the more simple : select 2 loop of edges by my system
or the 4 faces of the futur soon Michael ?

The Michael one will surely more polyvalent! :)

And avoid some headaches! :)
And no need to have 2 Selected nodes! :)
Alas seems the Offset "internal" bugged! :(

So, just looked at the last file.

""""""""""Are the objects you want to process like this a cuboid type shape bounded by planar faces on all sides?"""""""""""

No, kindof twisted a bit...

So I think Inset can do it currently, try setting the Thickness = 0 so it won't make a border and then check "use separate height" and put in your offset distance as the Height value.

If you want to keep the cut away portion as a separate object you can do that by checking "Grooved" and set groove width to 0.

- Michael

Missed that sneaky frontal assault from the rear!

That does it.

Michael,
Is there any "robustness" left in the geometry kernel regarding Offset\Shelling that you just haven't implemented? Or are we at the limits of what's available...

Thanks.

Hi Paquicinno, also one thing to note is that with surfaces that are not at a 90 degree angle to each other, offsetting surfaces will be a different result than offsetting edges + loft like you were doing before.

- Michael

Inset don't work for this objects! ... ;)

Hi Burr,

re:
> Is there any "robustness" left in the geometry kernel regarding Offset\Shelling that you just haven't
> implemented? Or are we at the limits of what's available...

Not really - it's got some fundamentally broken assumptions in it in this area. I think it could be a possibility to write a new one from scratch (unlike fillets) but it might be better to try to get this area better by integrating a different geometry kernel which I have to do anyway to improve fillets.

- Michael

Hi Pilou,

re:
> Inset don't work for this objects! ... ;)

It's working for me over here. Set Thickness = 0 and check "Use separate height" and put in the offset distance as the height value.

re: video - in your video you're not following the instructions I posted above.

- Michael

Frenchy,

Michael,

Aha! Well, fingers crossed for what the future holds on that...

Aaaah! Damned! It's a secret trick! :)

Excellent! Absolutly not logic but if it's works... :)

The Inset Function is endless surprising!

Basically the Inset command is focused on carving off a slab of the object and doing some other work on it but in this case you want to just throw away the slab and not have a border around it.

- Michael