The Short Answer
CAD files cannot go straight onto a website. They describe exact surfaces for manufacturing, while browsers need a light polygon mesh with materials. Converting CAD to a web-ready model means turning the surfaces into triangles, removing internal parts, reducing the polygon count, adding realistic materials and exporting a compressed GLB. It is usually cheaper than modelling from photos, because the shape and dimensions are already right.
Why CAD Is Not Web-Ready
CAD software such as SolidWorks, Fusion, Creo or Rhino stores shapes as precise mathematical surfaces. That is perfect for making a part and useless for a browser, which can only draw triangles.
- Too dense. Converting at full precision can produce millions of triangles for one product.
- Too much inside. Assemblies include screws, boards and mechanisms that will never be seen.
- No appearance. CAD colours are not real materials, and there are no texture coordinates for labels or finishes.
- Messy structure. Hundreds of parts with engineering names, odd scales and inconsistent orientation.
The Conversion, Step by Step
| Step | What happens |
|---|---|
| 1. Export | The engineering team exports STEP or a native file, ideally external parts only |
| 2. Tessellate | Surfaces become triangles at a precision chosen for the use, finer for renders, coarser for web |
| 3. Clean up | Hidden parts deleted, parts merged and renamed, scale and orientation fixed |
| 4. Reduce | Polygon count cut to the web budget while keeping the silhouette smooth |
| 5. Unwrap and texture | Texture coordinates added so labels, logos and finishes can be applied |
| 6. Materials | Physically based materials for plastic, metal, glass and fabric, matched to the real product |
| 7. Export and compress | GLB with Draco or Meshopt and KTX2 textures for the web, USDZ for iPhone AR |
Tools for the conversion range from Blender and Rhino to dedicated converters such as Pixyz and CAD Exchanger. The tool matters less than the judgement about what to keep.
One Source, Several Outputs
The same CAD conversion can feed a high-detail master for product renders, a lighter version for a website product viewer and AR, and the parts for an exploded-view animation. Planning all of them at the start avoids converting the same file twice.
Protecting Your IP
A marketing model needs the outside of the product, not how it works. Before sending files, ask engineering to remove internal mechanisms, tolerances and manufacturing notes, or to export only the external shell. Sign an NDA, and agree in writing that source files are deleted or returned after the project.
What It Costs
Working from CAD typically costs 30 to 50 percent less than modelling the same product from photos, but cleanup on a large assembly can still take days. See how much a 3D model costs for the full ranges.
Working With Kalex
Kalex converts CAD into web, AR and render-ready models in Blender, for manufacturers and brands worldwide. See our 3D modelling service or send us a STEP file under NDA.