Prepare PLY geometry for STL
The PLY-to-STL route uses the PLY reader, mesh preparation and the STL writer. Choose the geometry and representation required by the destination application.
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.
Write the selected surfaces as STL triangles
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.
Prepare triangulation for the selected geometry and write it with the OCCT STL interface. Set mesh detail for the destination task. STL does not retain the full assembly tree, names, colors or CAD metadata; keep the source model when those relationships matter.
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.
Check unit scale, bounds, face orientation and connectivity in the receiving application. Include small features and curved regions in the comparison. Producing an STL file does not itself validate printability, watertightness or suitability for material removal.
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.