...teaching maths to Archicad?

[Anonymous]

Hi everyone,
I'm trying to automate some calculations I need to do using AC13.

The calculation I need is very simple: gross zone volume.

So I created a list schedule, and asked AC to list zones by storey as in the attached screenshot.

Now, if you look at the values AC gives me, there must be an error somewhere:

AC calculation:

P0 volume: 92,79 m2 x 2,38 m = 215,35 m3

Good old calculator gives me instead:

P0 volume: 92,79 m2 x 2,38 m = 220,84 m3

I checked the BIM model one hurdred time but I cannot find the error. I know I must have set something wrong, but this is not the first time I have AC do this kind of calculations. It is definitely the first time I get such a big calculation error.
Does anyone have similar problems with calculations in AC?

[Barry Kelly]

Enrico wrote:
how do I get rid of this interference, if it does not depend on the "relationship to zones" or on a solid element operation?

What method are you using to place the zone?
Manual, inner edge or reference line?

How do the other walls fit around this zone?
i.e. what does it look like in plan.

Barry.

[Anonymous]

I placed the zone manually, by drawing its polygon.

[Barry Kelly]

If you have manually drawn the zone then I don't understand why it is trimming around the wall in 3D.

I assume that the 92.79m² matches the zone area exactly as it is drawn in plan.

If you delete the wall does it affect the 3D zone.

Clutching at staws here but move the zone away from the model and then see what the zone looks like in 3D. It will remain the same size if it is manually drawn.

Barry.

[Anonymous]

Yes, 92,79 m2 is exactly the area of the zone. The ploygon I drew manually is a simple rectangle.

If I delete the wall, then AC gives me the correct volume value.

If I copy the zone somewhere else, then the automatic subtraction disappears.


All pieces of evidence show that the wall is the problem.

How can I tell AC to calculate the volume based on the gross area instead of the net area?

[Miha Nahtigal]

Let me guess... is it complex (profile) wall?

I had the same problem and I think it's a bug in Archicad.

http://archicad-talk.graphisoft.com/viewtopic.php?p=184979

[Anonymous]

nope. pretty boring standard wall...

but I guess the same bug must happen even for normal walls

[Steve Jepson]

Not very likely but perhaps your zone stamp is not for the zone you think it is. ?
I downloaded your .pdf and put an area fill over the zone. The scale of the drawing is verified +/- by the door I added. The area is quite different from your zone area. ??

[Anonymous]

...and the winner is.... VUEGO!

I double checked, and it must be a bug. I just moved the zone border from the wall reference line by only 1 mm, and AC calculated the volume properly.

So, it's a bug.

Thanks everyone for your help!

Enrico



(so, now what? we keep the bug, pay for the yearly update, and...?)

[Tom Krowka]

I am interested in determining the volume of the zone minus the wall volumes. I tried to do it but have not been successful.

[Anonymous]

Can you adapt the zone to the inner edge of the walls?

Otherwise, you can create an interactive schedule to calculate the volume of the zone and of the walls, and you do the math separately...