Deliver OBJ polygonal geometry through STEP
OBJ-to-STEP conversion can retain a mesh representation throughout the OCCT workflow. STEP supports mesh writing, so a polygonal asset does not have to be reconstructed as analytic CAD geometry just to enter a STEP-based exchange system.
Read the supported OBJ geometry and build the document representation required by the writer. Choose a mesh-capable STEP configuration that the destination application can use.
Map objects and supported appearance
OBJ objects, groups and material references do not correspond automatically to a full product assembly. Define how the application maps imported items to STEP document entities and how it handles the supported names and colors.
Texture-based materials need explicit assessment. A graphics material and an engineering exchange attribute are different kinds of information; do not count visual equivalence as guaranteed merely because the geometry transfers successfully. Make any required external resources available during reading.
Distinguish mesh exchange from reconstruction
The receiving system should be checked for actual tessellated STEP support. Reopen the result and compare placement, scale, item identity and mesh coverage. The output remains polygonal unless an additional modeling operation changes it.
If the goal is editable smooth surfaces rather than mesh transfer, define a separate reconstruction scope with surface fitting and topology construction. Surface from Scattered Points provides one relevant capability. For a graphics destination that is closer to OBJ’s original use, compare OBJ to glTF.