Converting CAD Files to Web-Ready 3D Models

CAD vs Web 3D Difference

CAD (Computer-Aided Design) files used for manufacturing and 3D models displayed on the web serve different purposes. CAD files carry mathematical precision, tolerances, and manufacturing data, while web 3D models are optimized for visual presentation and interaction.

CAD files are typically NURBS-based, defining infinitely smooth surfaces. Web 3D models are polygon mesh-based - surfaces are made of triangles.

Common CAD Formats

Conversion Process

Step 1: Importing the CAD File

Open the CAD file with Blender, FreeCAD, or another tool. Blender plugins like CAD Sketcher provide STEP support.

Step 2: Converting to Mesh (Tessellation)

NURBS surfaces are converted to polygon mesh. Tessellation quality is critical at this stage - balance smooth appearance with reasonable file size.

Step 3: Retopology (Optional)

Mesh from CAD conversion is typically irregular. Retopology creates clean, organized mesh. Not mandatory but improves file size and render performance.

Step 4: Adding PBR Materials

CAD files typically carry basic color info. For realistic web appearance, PBR materials must be added: metallic, roughness, normal maps.

Step 5: Exporting as GLB

Export the model in GLB format. Apply Draco compression to reduce file size.

Conclusion

Your existing CAD files are a valuable starting point for e-commerce 3D visuals. The conversion process may seem complex at first but can be made efficient with the right tools and workflow.