Read 3DS for OBJ output
A 3DS-to-OBJ workflow connects the 3DS reader to the OBJ 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.
Prepare polygonal geometry for OBJ
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.
Write the selected surface mesh with the OBJ interface. Establish whether the consumer needs per-part grouping, normals or supported appearance information, and preserve any associated material resources produced by the writer. A polygon file is not a replacement for the full CAD document.
Check the OBJ result
Compare object placement and supported material assignments. Keep companion resources with the input and check the scale expected by the receiving tool.
Check the OBJ in the receiving graphics or geometry tool, including scale, face orientation, grouping and companion-file references. Where a flat mesh cannot retain the original assembly relationships, keep that engineering information separately.
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.