Export to gbXML Using Room/Space Volumes

After placing rooms or spaces in the model, you can export the model to gbXML for analysis using other software.

1. Add rooms or spaces to the model.

   An effective analysis can be performed only if the entire volume of the building model is included in load calculations.

2. Open a 3D view of the model.
3. Click File tab Export(gbXML).
4. In the Export gbXML dialog, select Use Room/Space Volumes.
5. If the Volumes Not Computed dialog displays, asking if you want to enable the Areas and Volumes setting, click Yes.
6. Examine the volume in the analytical model:
   1. In the Export gbXML dialog, on the General tab, for Export Category, select Rooms or Spaces.
   2. Complete the remaining parameters on the General tab, as appropriate. See About the General tab.
   3. Click the Details tab, and in the right pane, expand the tree structure for the building model.
      Tip: You can right-click an item to expand or collapse the list.
   4. If warnings display for the building or an item, select the item, and click (Show Related Warnings) to learn the cause.

      Then cancel the Export gbXML dialog and correct the problem in the building model. Review and correct warnings until all of the warnings have been resolved throughout the model.

   5. In the preview of the Export gbXML dialog, zoom in, pan and spin the analytical model to examine the volumes of rooms or spaces in the building.

      Color should completely fill the volume for all rooms or spaces in the model. If you detect rooms or spaces without fill, cancel the Export gbXML dialog, and resolve the unshaded areas. When areas are too small to place a room or space, merge the volume for cavities, shafts, and chases with a tangent room or space.

      Note: Sliver spaces and the zones associated with sliver spaces display (as shaded) in the analytical model. Sliver spaces do not display in plan or section views.
   6. If Export Category is set to Spaces, you can select a space and specify energy information, including the Space Type, Construction Type, People, and Electrical Loads.
7. Examine analytical surfaces:
   1. In the Export gbXML dialog, on the Details tab, click Analytical Surfaces, and expand the levels and rooms, or zones and spaces.

      The hierarchy expands to display Roofs, Interior and Exterior Walls, Floors and Slabs, Windows, Doors and Openings. These can be further expanded to display the individual surfaces and openings for a room or space. See Surface Element for information about surface and opening names.

   2. In a room or space, select a surface type (for example, Interior Walls), and click (Isolate).

      You can also select individual surfaces from within the surface type folder for a room or space.

   3. Zoom in, pan, and spin the analytical model as needed to examine all surfaces in the model, checking to be sure that each surface is correctly identified.

      If you detect surfaces that are incorrectly identified, cancel the gbXML Export dialog, and fix the problem in the building model.

   4. If you are satisfied with the integrity of the analytical model, click Next.
8. In the Export gbXML dialog, navigate to a folder where you want to save the gbXML file.
9. Enter a name for the gbXML file, and click Save.

Revit exports the model with analytical volumes to a gbXML file in the specified location.