STL to OBJ Converter

This tool converts STL files to OBJ for 3D modeling, rendering, and fabrication workflows. It accepts ASCII or binary STL, reads triangle geometry, vertex positions, and per-vertex normals. Users specify optional unit conversion to align coordinates with their target pipeline.
Core logic parses STL data, applies an optional scale factor and unit conversion, and outputs OBJ vertex and normal lists with faces that reference those indices. If enabled, a default MTL file is generated to accompany the OBJ so basic shading can be applied in renderers. The converter does not create texture coordinates unless they are present in the input. It validates the mesh, preserves geometry, and reports counts for vertices and faces to help verify results.
Audience includes 3D artists, CAD technicians, 3D printing engineers, and game developers who migrate assets between STL-based sources and OBJ-based tools. Unique value lies in robust ASCII/binary STL handling, straightforward unit scaling, and optional MTL export in a lightweight, scriptable workflow. Use cases include preparing scanned parts for rendering, importing printer-ready meshes into content pipelines, and integrating with batch processing scripts for asset libraries.
Note: colors or non-geometric metadata in STL are ignored; large files may require streaming or chunked processing for memory efficiency.