Read 3DS for STL output
A 3DS-to-STL workflow connects the 3DS reader to the STL writer. Select the model items and output representation needed by the receiving application.
Read the 3DS mesh asset and inspect its object organization and material references. Select the source objects needed by the engineering application.
Write the selected surfaces as STL triangles
The Assimp integration provides mesh geometry, colors, materials and scene structure for its supported inputs. Pass that data to a separate OCCT or commercial writer. For STEP, STEP XML or DXF output, use the mesh-capable representation; this does not reconstruct BRep surfaces from polygons.
Prepare triangulation for the selected geometry and write it with the OCCT STL interface. Set mesh detail for the destination task. STL does not retain the full assembly tree, names, colors or CAD metadata; keep the source model when those relationships matter.
Check the STL result
Compare object placement and supported material assignments. Keep companion resources with the input and check the scale expected by the receiving tool.
Check unit scale, bounds, face orientation and connectivity in the receiving application. Include small features and curved regions in the comparison. Producing an STL file does not itself validate printability, watertightness or suitability for material removal.
Discuss this conversion with the producing and receiving applications, representative files and required geometry and attributes. Compare the reader/writer catalog when a different representation is needed.