Read 3MF for STEP output
Transfer 3MF meshes into a STEP workflow with the 3MF reader and STEP writer. This route carries polygonal geometry in the receiving document; it does not recreate the original CAD surfaces or feature history.
Read the mesh content available through the Assimp integration from the 3MF input. Inspect the imported object structure and appearance before constructing the target document.
Configure the STEP geometry and document mapping
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 imported model through the OCCT STEP interface. STEP supports BRep and mesh workflows, so choose the representation supported by the receiving application. Use the document layer when names, colors and assembly relationships are available and need to be transferred.
Check the STEP result
Check the geometry and placement of each imported item. Manufacturing settings and process-specific information require separate validation and should not be assumed to survive a geometry exchange.
Reopen the STEP file in the destination and compare geometry coverage, placements, names and colors. A mesh representation remains polygonal inside STEP. If the next task requires solid modeling, verify that the source and output contain the required BRep geometry.
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.