@RIPENG That was a really informative answer. It has helped me through the past few weeks as I've struggled to develop an effective workflow for exporting a usable gbXML model from a Revit model to use in Trane's Trace 3D software analysis program. I would like to use OpenStudio, but I've found that Trace 3D has more going for it in terms of user friendliness.
However, I am frustrated that I cannot use space parameters (e.g. airflow, loads, lighting, people density, etc.) and building construction parameters (e.g. R-values, fenestration characteristics, etc.) for the elements from Revit to export into Trace 3D, as Trace 3D currently does not support that information from an imported gbXML. Trace 3D's official stance is that the user should use and modify building construction and the room types' templates in order to input that info. I do like the fact I can use the templates, but I think that Trace 3D should allow users to choose whether they want to use their templates or import the info from the gbXML. More flexibility in my opinion. This lack also makes it difficult to iterate load/energy models.
E.g. when I want to modify a wall or change the ceiling height or some other geometry related issue (generally speaking better/more refined geometry), I have to go back to Revit, re-create the geometry, delete the energy model, re-create the energy model, bring it back into a validator, re-validate and fix the serious errors/warnings, then import the fixed gbXML model back into Trace, which requires that I completely delete the old gbXML and load the new gbXML in. Then once the gbXML is loaded back in, I need to re-assign any custom loads and building construction parameters (although depending on how 'consistent' the loads and construction of the building is, the building construction and room type templates can greatly assist with this) to each room/space. This is a time-consuming process that I wish could be avoided. I.e. I wish I could use the information that I can already input into the Revit model in the Trace 3D program.
Specifically, regarding the advice that space separation lines be used instead of walls, I definitely see the value in that. However, if you are fairly careful and methodical in assigning walls, floors, ceilings, roofs the appropriate exterior or interior construction type designation, you can avoid some of the more common problems. This Autodesk page is useful for figuring that out (link here). Also, splitting walls interior that are not meant to be a boundary of room is a must. Otherwise random walls will be created in the gbXML model. Then make sure to set the energy model building envelope setting to Function, to use those construction type designations for creating the energy model. That helps me create my models.
I am linking a picture of my personal workflow for creating usable gbXML files in Revit to use Trane Trace 3D. I know I was very specific in regards to the software that I use for load analysis, but I would prefer to be explicit on how and why I use the process I do. Hope this helps someone!
