Contributed to the godotengine/godot repository by delivering vertex shading support across multiple rendering backends, focusing on enhancing lighting fidelity and ensuring consistent rendering behavior. The work involved implementing shader modifications and configuration updates using C++, OpenGL, and GLSL, enabling more detailed light interactions at the vertex level. Special attention was given to optimizing performance for lower-end devices, with the Compatibility renderer offering the most comprehensive support, while mobile and Forward+ backends were adapted to use a single directional light shader. This approach balanced advanced graphical features with platform constraints, improving both rendering quality and cross-backend compatibility without sacrificing performance.