Exporting a 3D model (GLB)

Step by step

1. 1

   Open the GLB export

   On the web app, Top bar → Export / Print / Share → GLB (3D model · AR · Blender · SketchUp). The Export as 3D model (GLB) dialog opens. The menu holds every way out of a design, so pick the right one for the job: GLB is the 3D model; DXF is a layered 2D CAD drawing; PNG/JPG/PDF or Print is a picture of the plan; Backup is the editable JSON copy that RoomSketch3D can open again. GLB is the only one that carries the 3D shapes.

   

2. 2

   What you get

   A .glb file containing the full 3D scene — walls, doors, windows, stairs, and furniture, the same geometry the 3D view renders. It's AR-ready and at real-world size, in metres (Android Scene Viewer opens it directly; for iPhone's Quick Look convert it to USDZ, see Use it in AR) and opens in Blender, SketchUp, three.js, and Babylon.js. The dialog says the same: Real-world size, in metres. Open it in AR and 3D viewers that read glTF/GLB. iPhone and iPad Quick Look need a USDZ file — convert it first, for example with Apple's Reality Converter on a Mac.

   What's in it and what isn't:

   In the file	Left out
   Walls with their door and window openings, floors, stairs	The ceiling (so you can see into the rooms from above)
   Every furniture piece with its colours and finishes	The yard: lawn, zones and outdoor ground
   Textures, embedded in the file	2D-only things: dimensions, labels, room names, notes
   Every floor you tick, stacked at its height	The camera, lights and sky of the 3D view

   The file is named after your design (Medium 2-Bedroom Apartment becomes `medium-2-bedroom-apartment.glb`).

   

3. 3

   Pick the floors

   On a multi-floor design, Floors to include lists every floor, all ticked (Select all / Select active only). The floors you keep are stacked in one GLB, one above the other, like the house. On a one-floor design this list doesn't appear: the dialog goes straight to Export GLB. To export one storey of a house on its own (say, just the upstairs for a bedroom render), tap Select active only while that floor is open, or untick the others.

4. 4

   Export

   Click Export GLB. Building the model takes one to three seconds on a furnished plan; the file then downloads. Size is typically 5–60 MB depending on furniture count. A toast at the bottom reads Building 3D model… while it works, then a green one reads Saved your-design.glb with the hint Open it in Blender or any glTF viewer. The file lands wherever your browser saves downloads. For scale: the furnished two-bedroom apartment in these pictures (811 sq ft, fully furnished) came out at 54 MB (November 2026), with 338 meshes, about 144,000 triangles and its textures inside. An empty room is a fraction of that; furniture and its textures are most of the size. The export works in any web browser, including the browser on a phone or tablet; it's the iPhone, iPad and Android apps that don't have it.

   

5. 5

   Open it: it's already real size

   Open the file in any glTF viewer or 3D program: in Blender, File → Import → glTF 2.0 (.glb/.gltf); on the web, drag it into a glTF viewer page. You'll see the plan as a doll's house with the ceiling off, every piece in place.

   The scale. The glTF standard measures every length in metres, and a RoomSketch3D GLB follows it: one unit in the file is one metre, at real size. Nothing to convert. The two-bedroom apartment above is 30 ft 6½ in by 26 ft 6½ in on the plan, and the exported model's bounding box measures 9.31 m × 8.09 m (30.5 × 26.5 ft) in the viewer, exactly the plan's outside size. Blender, Unity, Unreal, three.js and AR viewers all read it that way, so a sofa measures as the sofa you placed and the room appears at its true size in AR.

   Working in another unit? Let your program convert on import (Blender's Unit Scale and SketchUp's import units do this), or scale once:

   You want the model in	Scale by
   Metres (the file's own unit)	nothing to do
   Centimetres	100
   Millimetres	1000
   Inches	39.37
   Feet	3.281

   A GLB downloaded before November 3, 2026 was stored at 1 unit = 10 inches, so it opens about 3.94× too large. Export it again for a real-size file, or scale the old one by 0.254 once: in Blender select everything (A), scale (S, type 0.254, Enter), then apply it (Ctrl+A → Scale).

   

6. 6

   Use it in AR

   Android: Google's Scene Viewer opens glTF 2.0 / GLB files directly, and because the file is in metres the room appears at its real size. iPhone and iPad: Apple's AR Quick Look displays USDZ (and Reality) files, not GLB, which is what the export dialog says too. Convert the GLB to USDZ first: Apple's free Reality Converter on a Mac does it (drag the file in and it shows the converted USDZ, ready to export), as do other 3D programs that save USDZ. The USDZ opens in AR from Files, Messages or Mail. The scale carries over, so there's nothing to resize. A whole furnished apartment at real size is too big to place on a table; for AR, a single room (or the furniture of one room) on its own reads much better. Duplicate the design, delete what you don't need from the copy, and export that.

Common mistakes

Related guides