Convert SH3D to OBJ

A renderer, game engine, CAD package, or fabrication workflow may require OBJ when it cannot open a Sweet Home 3D project. Exporting also provides a shareable mesh for users who do not have Sweet Home 3D, but it does not preserve the original editable floor plan.

What the SH3D format is

.sh3d is the native project format of Sweet Home 3D, an interior-design application used to draw floor plans, place furniture, and inspect rooms in 3D. A project contains walls, rooms, furniture positions, finishes, and references or resources for imported 3D models. SH3D is a project format rather than a general-purpose 3D interchange format, so it is normally opened in Sweet Home 3D by homeowners, interior designers, and floor-plan creators.

What the OBJ format is

.obj is a widely supported, text-based mesh format accepted by Blender, Maya, 3ds Max, SketchUp, CAD software, game engines, and many 3D viewers. It can contain vertex positions, polygon faces, normals, texture coordinates, and references to materials. Sweet Home 3D normally exports an OBJ file with a matching .mtl material file and, where applicable, image textures.

OBJ is useful for exchanging the visible 3D geometry, but it does not retain Sweet Home 3D walls as editable floor-plan objects, furniture catalog metadata, room calculations, dimensions, cameras, lights, or project behavior. The original .sh3d file should therefore be retained as the editable master.

How to convert SH3D to OBJ

The dependable conversion method is the desktop version of Sweet Home 3D, because it can read the project and resolve its furniture and scene data before exporting the 3D view.

1. Install Sweet Home 3D from the official Sweet Home 3D website and open the desktop application.
2. Choose File → Open and select the .sh3d project.
3. Inspect the 3D view. Hide or remove objects that should not be included, and check that imported furniture and textures load correctly.
4. Choose 3D view → Export to OBJ format....
5. Select an output folder and filename, then confirm the export.
6. Keep the generated .obj, .mtl, and texture image files in the same relative arrangement. In Blender, import the result with File → Import → Wavefront (.obj).

If the export command is missing, verify that the desktop application is being used and update Sweet Home 3D. Do not rename .sh3d to .obj; changing a filename extension does not change the file contents.

Online conversion options

There is no consistently reliable mainstream online converter for SH3D input. Services such as CloudConvert and Convertio may not accept SH3D, and a web service may fail to resolve furniture or texture resources referenced by the project. Uploading a private floor plan can also create a confidentiality issue. Use Sweet Home 3D locally, then upload the resulting OBJ only if an online processing service is required for a later workflow.

Quality and compatibility limitations

• The export is a polygon mesh of the 3D view, not an editable Sweet Home 3D scene. Correct walls, room boundaries, furniture placement, and dimensions in the SH3D project before exporting.
• OBJ material support is limited compared with modern scene formats. Missing or moved texture images, incorrect relative paths, or an absent .mtl file can produce untextured or incorrectly colored surfaces.
• OBJ has no universally enforced unit declaration. Sweet Home 3D projects commonly use metric measurements, but the importing program may require a unit or scale setting.
• Detailed furniture and large floor plans can produce high polygon counts and large files. Hide unnecessary objects or replace overly detailed furniture before export when the target application has memory or performance limits.
• Geometry may be divided into multiple objects or material groups. The receiving application may require objects to be joined, renamed, or reorganized.
• Verify the result in the target application rather than relying only on the export preview; check scale, missing textures, face orientation, and material assignments.