Read XCAF for OBJ output
A XCAF-to-OBJ workflow connects the XCAF reader to the OBJ writer. Select the model items and output representation needed by the receiving application.
Read the native XCAF document with the OCCT storage interface matching its file type. Inspect document shapes, assembly occurrences and attributes before selecting the part of the document to exchange.
Prepare polygonal geometry for OBJ
Choose BRep or mesh geometry according to the actual shapes in the document and the destination. Resolve assembly placements and map supported names and colors. Native document storage can contain application information that another CAD or scene format does not represent.
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
Check occurrence placement separately from shared part geometry. Validate transferred labels and attributes, and keep the source XCAF document when application-specific data or edit structure needs to be retained.
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.