Bonsai | IfcOpenShell v Bonsai QTO engine comparison

1. S by steverugi on 18 Sep 2024, edited 28 Sep 2024 # +17 votes

   since the introduction of double engine for quantity take-off (QTO) sometimes one is prefererable over the other, for those who need to extract quantities this might be of use:

   Overall

   Bonsai looks better than IfcOpenShell for QTO on the traditional elements like slab, wall, column, beam, saved for the length of last two for which the side dimension is given instead, the same happens to elements not included in this test (Bonsai v0.8.1-alpha240916) like footing beams.

   IfcOpenShell

   • (+) accurate length of all 4 elements (slab, wall, column, beam)

   • (-) does not calculate Gross and NetWeight based on material density

   • (-) does not calculate Gross and NetFootPrintArea in walls

   Bonsai

   • (-) uses the Y value for length of columns and beams instead of Z

   • (+) calculates weight based on material density

   Both

   • (-) no SectionArea calculation of columns and beams available

   see table below as summary:

   

   kindly comment if you spot inaccuracies or missing information

   thanks and happy modeling

   Legend

   • [-] quantity not available in relevant Quantity set

   • [O] quantity not calculated

   • [X] wrong calculation

   • [V] quantity calculated correctly

2. S by steverugi on 18 Sep 2024 # +7 votes

   Update with foundation elements (footing pad, strip, beam)

   based on the above post I think this table is self-explanatory, otherwise let me know

   

3. M by Moult on 19 Sep 2024 #

   Can you help file a bug with sample objects whenever the IfcOpenShell engine calculates an incorrect value? This is really, really valuable.

4. S by steverugi on 20 Sep 2024 # +1 votes

   Hi @Moult

   Can you help file a bug with sample objects whenever the IfcOpenShell engine calculates an incorrect value? This is really, really valuable.

   sure, in the mean time please see what I filed last June #4783 on the seeminlgy incorrect orientation of footing beams

   thanks

5. S by steverugi on 28 Sep 2024 #

   @Moult said:

   Can you help file a bug with sample objects whenever the IfcOpenShell engine calculates an incorrect value? This is really, really valuable.

   Issue #5507: here you go

   after all the 'wrong' calculations using IfcOpenShell are only related to the way the IfcFooting[STRIPFOOTING] and [FOOTING_BEAM] are created in 3D, since they are extruded vertically and not horizontally as in real life

   Hope this helps

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