Prepare PLY geometry for STEP
The PLY-to-STEP route uses the PLY reader, mesh preparation and the STEP writer. Choose the geometry and representation required by the destination application. STEP can carry mesh data as well as BRep; this route does not imply recovery of analytic CAD surfaces from a mesh.
Read polygonal PLY through the Assimp import route. The native OCCT catalog lists PLY writing, while Assimp supplies a PLY reader. Check the imported faces and available vertex properties before selecting an output representation.
Assimp lists PLY among its supported inputs. Select a delivery with that reader enabled.
Configure the STEP geometry and document mapping
Transfer the imported polygonal geometry into the target mesh workflow. A point-only PLY needs a surface-reconstruction step before a surface-mesh export; changing its extension does not create face connectivity.
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.
Validate the converted model
Check face coverage and the property fields required by the recipient. PLY variants can use different properties, so color and other data need validation against the actual reader and writer mapping.
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.
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.