Prepare 3DS geometry for FBX
The 3DS-to-FBX route uses the 3DS reader, mesh preparation and the FBX writer. Choose the geometry and representation required by the destination application.
Read the 3DS mesh asset and inspect its object organization and material references. Select the source objects needed by the engineering application.
Prepare mesh geometry for FBX delivery
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 mesh geometry with the commercial FBX interface. Prepare the supported scene and placement mapping required by the receiving application. Check appearance and other attributes individually rather than assuming all source properties have an FBX writer mapping.
Validate the converted model
Compare object placement and supported material assignments. Keep companion resources with the input and check the scale expected by the receiving tool.
Reopen the FBX in the destination and compare scale, orientation, geometry coverage and placements. Verify the actual version and property mapping needed by that application. Retain the engineering source for information that the scene derivative cannot carry.
For repeated jobs, retain the source, preparation settings and representative output checks. Discuss this conversion with the input files, destination application and required geometry and attributes.