@brunopostle I did a bit research. #Revit has an extension for #energymodeling and options for #gbXML export through #Dynamo. #Rhino has #Honeybee and #Ladybug as energy extensions to #Grasshopper. #BIMServer can extract geometry from #IFC and serialise it as gbXML. #IDA-ICE imports IFC directly. What about #TopologicSverchok, can it extract geometry and export it as gbXML?

@brunopostle I think the conversion tool could be improved and packaged, and I am motivated to contribute to this nonetheless, if only to learn more of #IFC and #gbXML . It should be relevant, according to the thesis by MGVisschers. Maybe he has a good overview on the need for such a tool today, if he could be reached. Anybody activly working with #energymodeling should know. My guess is that proprietary #BIM tools has #gbXML export. Info could be inquired at #osarch .

@towi A #BonsaiBIM #gbxml exporter would be really easy with the way the ifcgbxml tool is currently written, but I'd like to know if the output is valuable first, there is no point in adding features that nobody uses

@brunopostle An export to #gbXML from #BonsaiBIM would be a good enabler for cost-effective design analysis.

@brunopostle I don't know about the relevance of #gbXML , beside it being used by #energyplus / #OpenStudio . From the thesis of MGVisschers, I get the impression that the format is supposed by all building energy simulation software. And I've seen there is already a well developed gbxml package on #pypi . To me, it seems obvious there should be a developed package for conversion between #IFC and gbxml.

@towi How practical is it to design a building in #BonsaiBim, or use it to fix up an existing #IFC #BIM model, generate a #gbxml model, and then either get useful design feedback, or calculations that can be used to prove the design?

@towi cool, what I don't know is how much #gbxml is used in the building industry, are there proprietary or otherwise better formats? What would a #IFC to gbxml to building energy-use calculation workflow look like?