MATLAB Implementation for OBJ File Reading with 3D Data Visualization

The OBJ file reader program serves as an essential tool for efficiently extracting data from ASCII-formatted 3D graphic files with OBJ extensions. This implementation employs MATLAB's file I/O functions to parse geometric elements including vertex coordinates (v), face indices (f), and normal vectors (vn) through line-by-line string processing and regular expression matching. Beyond data extraction, the program incorporates transformation matrices for advanced data processing and analysis, enabling comprehensive 3D model manipulation.

Through this OBJ reader implementation, users can rapidly load geometric data into MATLAB workspace memory and visualize it using patch or trisurf functions with customizable lighting and camera properties. The program architecture supports multiple 3D file formats through modular parser design, including OBJ, STL, and PLY formats, allowing flexible handling of diverse 3D graphics files with consistent data structures.

Complementing the core reading functionality, the program integrates homogeneous transformation matrices for 3D data processing operations. Users can perform real-time transformations using rotation matrices, scaling operations, and translation vectors through MATLAB's handle graphics system. Advanced features include surface normal calculations for shading analysis, vertex-based metric computations, and 3D model reconstruction algorithms for CAD and computational geometry applications.

In summary, this OBJ file reader represents a robust MATLAB solution for 3D graphics data processing, featuring intuitive syntax, multi-format compatibility, and extensible architecture. Its object-oriented design allows integration with point cloud processing, mesh optimization algorithms, and computer vision pipelines, making it suitable for diverse applications across engineering, scientific visualization, and digital content creation domains.