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How best to calculate "Negative Space"? Void volumes

rob2218
Enthusiast
How best to calculate the "voided" areas left from an SEO operation?
See diagram.
My client asked me early on..."Can Archicad calculate the missing space when we do earthwork from the site?"

I said I'd get back to him on that.......so...can we and how?
...Bobby Hollywood live from...
i>u
Edgewater, FL!
SOFTWARE VERSION:
Archicad 22, Archicad 23
Windows7 -OS, MAC Maverick OS
8 REPLIES 8
matjashka
Advocate
Bobby,
How about:

1) Perform SEO Intersection with the volume that cuts the holes in the ground, which will yield the "void" as a result
2) Change the result of intersection into a Morph
3) Query the Morph for Volume using the Element Information dialog box?

I haven't ran the numbers manually, but my resulting Morph looks legit.
Matt Krol [LinkedIn]
BHMS Architects and Planners, Chicago
AC 10 ... 26 USA
rob2218
Enthusiast
So...I gave it a test.
I converted one of the sites with the SEO voids into the "morph" and the morph yields a "0.00 volume" number? huh? dunno why it does that?

Can anyone explain this?
yet...when the "mesh" stays a "mesh" it will yield a volume number.....see attached image.

...Bobby Hollywood live from...
i>u
Edgewater, FL!
SOFTWARE VERSION:
Archicad 22, Archicad 23
Windows7 -OS, MAC Maverick OS
matjashka
Advocate
Bobby, see my above exercise, in screenshots.

In SEO, the slab was the Operator and the Mesh was the Target, then I hid the Operator. Turns out, the Element Information correctly returned the Volume of the *result* so you may even skip the Morph. I then converted it to a Morph that shows the same volume as the result of SEO, just to double check.

[edit] my original attachment failed, I think the size of the screenshot was too big.
Screen Shot 2017-06-02 at 3.06.26 PM.png
Matt Krol [LinkedIn]
BHMS Architects and Planners, Chicago
AC 10 ... 26 USA
rob2218
Enthusiast
I'll have to test out yer method............thank you.
...Bobby Hollywood live from...
i>u
Edgewater, FL!
SOFTWARE VERSION:
Archicad 22, Archicad 23
Windows7 -OS, MAC Maverick OS
Bruce
Advisor
To my knowledge, ARCHICAD can't do this automatically, like it does with a slab.

The other way (apart from matjashka's method) is to just have an original copy of the site mesh, prior to any editing. Just subtract from its volume the edited mesh's volume.
Bruce Walker
Barking Dog BIM YouTube
Mindmeister Mindmap
-- since v8.1 --
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Brett Brown
Advocate
Just to clarify Bruces reply you seem to want only a certain SEO quantity in red.

Simple, Drag a copy of the mesh to one side gives you a volume without any SEO's. Then drag a copy of the mesh and only the SEO's you want calculated to one side. That will give you another volume. Subtract that from the Non SEO volume of mesh.
Imac, Big Sur AC 20 NZ, AC 25 Solo UKI,
Brett Brown
Advocate
Also Rob, Have a look at this Tutorial on how to do your site meshes correctly right from the outset to avoid that unnecessary height. https://www.youtube.com/watch?v=JO2OaigIZbo&t=1353s
Imac, Big Sur AC 20 NZ, AC 25 Solo UKI,
Erwin Edel
Rockstar
You could also copy the mesh, copy your operators and do an intersect, instead of substraction, you should end up excactly with the negative space.
Erwin Edel, Project Lead, Leloup Architecten
www.leloup.nl

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