BIM slab

Yes, so many questions.
Until now I have to think - yes - 2 separate Slabs.

Thank you so much for answering Hans.
You can't imagine how happy I am that you finally gave your official ok

Going vertical it gets a bit more difficult I think.
Starting with a simple example, a multi Story Concrete Building.
A base Slab will be cast. After that the Walls will be cast on top of the Slab.
Next Slab, next Walls on top and so on.
So the structural elements only and finally someone will mount the insulation
an exterior wall finish package. Similar like the finish floor packages which
will come later.

But this does not match with Window and Door insertion which insert in and
cut one solid only. So Walls should be one single solid with multi ply composition.

And as the Wall's insulation ply should finally also cover the Slab,
does it matter if we set
a) our Wall Solids on top of the Slabs or
b) Wall on top of previous Wall and stop with the Slab at exterior Walls
inner side

Maybe the nice "Villa" is needed in a V18 LOD version.

It was part of the V16 BIM Tutorials.
You can find some mirrored versions by a youtube search.
Some still contain the links to download each steps geometry.

As it looks, Bricsys somehow "cleaned up" its Tutorial Videos a bit
when they dumped Bricscad TV.
It didn't like much how the Villa Videos were done at that time as they
are were quite fast, condenced and in a way like "type this then this ...."
without explaining what to do and especially because not explaining
what and why this way and not another way !
But I watched them (locally) again with V18 release and they are quite
important because each single step covers a special function you would
not expect or learn elsewhere that it even exists e.g. for me :
Setting the "Elevation" Z value in Property Panel when nothing is selected.

So not really for beginners but to refresh your knowledge if you already
have some experience.

Sorry to hijack your thread.

What I meant is that using separate Slabs for Structure and Finish
is very similar to Dividing Wall Solids into Structural and Insulation/Cover.
Which is not an option in most BIM applications in general.

I really like that Bricscad treats 3D's equally and does not prefer XY over
restricting vertical XZ and YZ planes like most other BIM solutions do.

Slabs do not very differ from Walls. Slabs also may require openings
which may be also automatically created by Insertion Objects similar
to Windows and Doors that can be assigned to a single Solid only.

Maybe in the future we will get some more BIM Tools that will do such
interactions. Maybe not usual parametric but stupid tools, more
Bricscad AI like.
I think of tools to create Railings, or in this case Stairs that will cut openings
in in Slabs automatically like Windows do in Walls.
And such a Floor Package may hinder at the end.

So we have to predict the same problems and find solutions in both,
Wall and Slabs situations in a similar manner :
When each room has a different Wall Finish (plaster/paint/wood panels/...),
should I create a large amount of Wall Compositions of nearly the same
Wall type, just to cover all situations
or
do I better separate these plies by extra Solids, with the problem of recreating
openings manually without any linking in case of later changes.

Or will there be a better solution like transfering info and control over to
Space Objects ?
Or kind of Compositions with flexible Plies ?

@Hans De Backer said:

At present it is indeed cumbersome to use inserts to cut through more than a single multi-ply solid, be it a wall, floor or roof. We have plans to make this possible, but, for the time being, it is better to strive for a single multi-ply solid approach.

I am really happy to read this
At least for now, I came to the conclusion that cutting through more elements
can be an important advantage in the future. (I may not overview this far enough)
And I think that I have already seen such a system. I think it was FormZ's,
what they call, BIM light.
And when I saw V16 for the first time and set that mysterious cut volume layer
visible and saw the 1 m depth red booleans, I instantly thought, wow, so cool,
so simple, they just cut through everything
(Coming from my complex but restricted BIM)

And today I thought, maybe just no one tried before to extend a Window's
cut volume and check what happens. So I tried today and see it doesn't cut
through more than one solid indeed

But of course I will go Single Multi Ply Solids for now.

Another factor that influences how to model a building, is how you want to the Quantity take-off to be structured.
E.g. do you prefer to measure quantities per floor, or do you prefer that e.g. an exterior wall that spans multiple floors is reported as a single entity? My (personal) preference is to measure per floor, so that is also how I model. For larger buildings it also can be handy to use one file per floor.

Didn't even think about that so far. Interesting.

So, for the example concrete building you described, I would model the base slab, place the ground-floor walls on top of it, next slab, first floor walls, and so on. The load-bearing ply of the multi-ply wall sits on top of the floor slab and extends to the bottom of the slab above.
The insulation and exterior finish plies are not interrupted by the slabs and reach to meet the insulation and finish plies of the next floor.

Not sure If I got that right.
If I have flush "Single" multi ply Solids.
In both cases I have to finally cut one of the Solids partly at a ply level.

If I put Walls on Slabs, I have to pull the insulation ply of the Wall down over
the Slab which will finally cut, at least a single part of that Slabs boundary to
free space for the insulation thickness.
If I put Walls on Walls and Slab inside, I will need to pull out the Slab('s ply)
and cut the structure ply of the Wall.
(Or just do nothing if both Structural Plies are identical opposed to
Concrete Slab vs Masonry situation)

I asked about which way may be better as these complex ply to ply connections
were very tedious to heal in case of needed changes in connections.
And not included in my BIMSUGGEST roboter.

Or am I totally wrong here.

To avoid that the generated facade drawings contain undesired horizontal 'bands' per floor, switch On the 'Union Section' property of the Material used for the outermost ply. This flag not only allows to avoid undesired dividing miter lines for e.g. floor plan walls, but also to avoid undesired dividing lines in facades. Note: this 'union' operation comes at a cost, so it's better to only switch it On when actually wanted.

Have a nice weekend!

Very good Tip !

And this is another question.
In my current BIM it simply isn't practical to use Objects that exceed more than
one Story and also split levels not really doable.
In Bricscad it doesn't look like a big problem.
Why not just make single Exterior Walls and Stair Case Cores over the whole
Building Height.
In VW this would take my ability of independent Story visibility and such things,
but in Bricscad I don't have that either and it doesn't interfere if I use Sections
with depth for that.
Do I miss anything important that would bring me in a dead end street later ?

A solution for cutting through multiple solids could be creating an 'empty' block with subtractor only and placing it on the other solid(s).
Next make a group for the 2 (or multiple) blocks. Now move the group and the solids will be cut at the new position. I tested this and it works.
However I didn't have parameters assigned to the second block. And it even looks like you can modify the parameters of grouped objects...

Edit: you can indeed modify common parameters of a group.
Edit: added an example with 2 windows grouped on 2 walls. Replace the second with the 'empty' cutting block and the same parameters.

What about looking at it from the opposite side,
dealing with Clip Volumes in the first place and insertion Objects
like Windows and Doors will just fit themselves into these voids
and adapt to changes.
While Clip Cubes being parametrical to always access and edit
their dimensions and origin.