OBJ Files for SolidWorks Engineers: What They Are and How to Handle Them
If you work in SolidWorks and an OBJ file just landed in your inbox, it probably came from outside your CAD workflow — a 3D scanning service, an industrial designer working in Blender, or a client sharing a reference model. OBJ is a mesh format, not a CAD format, and SolidWorks treats it very differently from the files you work with every day.
This guide explains what OBJ files are, how to open them in SolidWorks, when converting them is worth the effort, and how to keep them organized alongside your project files.
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What is an OBJ file?
An OBJ file is an open mesh format originally developed by Wavefront Technologies. It describes a model's surface as a mesh of flat facets, with an accompanying MTL file carrying material and texture data. That two-file pairing matters: separate an OBJ from its MTL and the model opens gray, with all appearance data gone.
OBJ files are fundamentally different from SLDPRT or STEP files. SolidWorks parts carry precise geometry and a feature tree you can edit; an OBJ carries only the tessellated surface — no features, no dimensions, no design intent. It's a photograph of the shape, not the blueprint.
Why would a SolidWorks engineer receive an OBJ file?
3D scan data: Scanning services commonly deliver OBJ (or STL) meshes. If you're reverse-engineering a legacy part or fitting a design to an existing physical object, this is the most likely source.
Industrial design concepts: Designers working in Blender, Maya, or similar tools hand over concept geometry as OBJ. Your job is turning that surface into manufacturable CAD.
Client reference models: Customers without CAD licenses often share whatever their tools export — OBJ is a common denominator.
Rendering and visualization: Marketing or visualization teams may request or supply OBJ because their rendering tools prefer mesh formats with textures.
How to open an OBJ file as a SolidWorks engineer
1. Import it into SolidWorks as a mesh body. Use File > Open, set the file type to mesh files, and SolidWorks brings the OBJ in as a graphics or mesh body. You can view it, measure against it, and model around it as reference geometry. You cannot edit it like a normal part — there's no feature tree to work with. SolidWorks 2023 and later also handle textured OBJ imports better than earlier versions.
2. Convert it with ScanTo3D. On SolidWorks Professional and Premium, the ScanTo3D add-in converts OBJ meshes into surfaces and solids with guided tools. It works well for scan data and prismatic shapes; complex organic meshes still take real reverse-modeling time.
3. Open it in the browser with Sibe. If you just need to look at the model or show it to someone, skip CAD entirely. Upload the OBJ to Sibe's Web Dashboard and it opens in the browser — rotate it, inspect it, and send a free public share link so clients or the shop floor see it without a CAD license or a Sibe account. Sibe is a Cloud CAD Document Management platform, so the file stays versioned with the rest of the project instead of living in an email thread.
4. Ask for the source format. If the OBJ came from a CAD system, the fastest path is asking the sender for STEP instead. You get exact geometry and skip mesh conversion entirely. Reserve mesh conversion for cases where no CAD source exists — like scans of physical objects.
OBJ vs the formats you already use
The pattern: OBJ and STL are meshes — approximations for viewing, scanning, and rendering. STEP and SLDPRT carry exact geometry — what you need for engineering and manufacturing. When precision matters, work in exact formats and treat meshes as reference.
Keep mesh files with the project, not beside it
OBJ files usually arrive by email or a shared-drive dump, then live loose next to the SolidWorks project they belong to. That's how the MTL gets separated from its OBJ, how "final_scan_v3.obj" multiplies, and how nobody remembers which mesh matched which revision.
Sibe is a cost-effective Cloud CAD Document Management platform built for SolidWorks teams. Your parts, assemblies, and drawings are versioned automatically — engineers check files in and out directly in SolidWorks — and the mesh files that arrive with a project stay organized with it. OBJ files open directly in the Web Dashboard, so reviewers, clients, and suppliers view the model in any browser through free public share links — no CAD seat, no Sibe account. Live in under 20 minutes.
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Frequently Asked Questions (FAQs)
Can SolidWorks open OBJ files?
Yes. SolidWorks imports OBJ files as mesh or graphics bodies through the standard Open dialog — you can view them, measure against them, and use them as reference geometry. There's no feature tree, so editing them like a native part isn't possible without conversion.
How do I convert an OBJ file to a SolidWorks part?
The ScanTo3D add-in, included with SolidWorks Professional and Premium, converts meshes to surfaces and solids with guided tools. Simple and prismatic shapes convert quickly; organic scan data can take hours of reverse modeling. If the OBJ was exported from another CAD system, ask for a STEP file instead — it's exact geometry and skips conversion.
Can I view an OBJ file without SolidWorks or any CAD software?
Yes. Sibe's Web Dashboard opens OBJ files in the browser — upload the file, view the model, and share it with a free public link that recipients open without any account or software. Editors and Contributors can also pin comments on 3D models for design reviews.
What's the difference between OBJ and STL?
Both are mesh formats, but OBJ stores material and texture data in a companion MTL file, while STL carries geometry only. Neither contains the precise, editable geometry of a STEP or SLDPRT file.
What's the difference between OBJ and STEP?
OBJ approximates a shape with flat facets; STEP describes exact geometry that CAD systems can edit and manufacturing can trust. For any engineering use, request STEP when it exists — use OBJ when the source is a scan or a rendering tool.
Can SolidWorks export OBJ files?
SolidWorks exports mesh formats like STL and 3MF from every recent version; OBJ export availability depends on your version and add-ins, so check your Save As list. If a rendering team needs OBJ specifically, exporting STL and converting with a free tool like Blender is a reliable path.
Why does my imported OBJ look faceted or rough?
Mesh resolution is fixed when the file is exported — SolidWorks displays exactly the facets the file contains. Ask the sender to re-export at higher resolution, or request the source geometry if smoothness matters.