Quantities from IFC or Solibri

Sander E

Hi All,

I don’t know if this post speciality is for Solibri, but maybe someone knows the answer.

We are working with Solibri and BIMcollabZOOM and I see different quantities in the components.

For Example:
When I select a component in Solibri I see in the quantities the bounding box length. In the other tab Dimensions I see the Length. These are different, and I see it is a gross/net quantity.

But if I look in ZOOM, I see only quantities that are exported in the IFC and that’s only the Length.

I am shocking to see that, because if I want to make list in ZOOM, I have the wrong lengths.

So,… my question in this story is:

How do I know in Solibri the difference of the IFC dimension or the Solibri dimension.
And how can I check that the IFC dimension is correct, without making specific component rules.

quantities from IFC.png

Matti

How do I know in Solibri the difference of the IFC dimension or the Solibri dimension.

Create an ITO with Solibri and IFC dimesion column. See differences in Excel.
Create a rule that compares these two properties. Use rule template #231
Keep in mind the bounding box might be correct value in this case but not usable e.g. for areas

And how can I check that the IFC dimension is correct, without making specific component rules.

For bounding box dimensions this could work with checking Any with rule template #231.
With quantities you need to use specific component. One workaround could be using classifications for both IFC dimension and the Solibri dimension and compare classifications.

Sander E

Thanks for your reaction.

But,… WOW! I see huges of problems now.

I think I am not the only one with this?

JeroenKoomen

Propertysets that are black (for examples Quantities) are calculated by Solibri using the IFC geometry.
Propertysets that are grey/lightblue and italic contain information exported by the modelling software. In this case the propertyset Dimensions.
Both are not allways correct… so we put them side by side in a ITO. If there is a big difference then you know you have to investigate further…

chris

My advise is, to compare always the different quantities. The ones from Ifc, Solibri and maybe also the one from the autoring tool.
I would check this quantities for every element!

Sander E

Thanks for the answers.
I have a lot of work to do i see.

What is the leading dimension? I think the dimension in the ifc is leading?

chris

you have to verify and check for every component group. at one group is the IfcQuantity at the other is better to take the ones from Solibri…

marchi

https://society.solibri.com/topic/356/scary-solibri-halloween-story?_=1607011055404

had the same problem a while ago - spaces had a huge difference between solibri calculated and native ifc properties. since then I always try to check the “blue”/native properties.

Sander E

Thanks Marchi.

Good to see I am not the only one with this shocking result.

I know what to do.

#topic can be closed.