Worked on the Godot engine repository to address a performance regression in the CSG autosmoothing path, focusing on mesh generation and real-time 3D graphics. The approach involved refactoring the surface-building process in C++ to clearly separate logic for smoothed and default surfaces, which reduced the risk of future regressions and improved maintainability. By profiling and optimizing the autosmoothing workflow, the changes led to more predictable behavior and enhanced rendering performance for both editor and runtime environments. This targeted bug fix demonstrated a strong understanding of performance optimization and mesh generation, contributing to a more robust and efficient CSG implementation.