During September 2025, Xiao Lei focused on stabilizing the Universal Render Pipeline’s Screen Space Shadows within the Unity-Technologies/Graphics repository. He addressed a depth sampling issue in the shadow rendering path, implementing a targeted fix that improved depth precision and eliminated visual artifacts across various camera configurations. Working primarily with HLSL and leveraging expertise in graphics programming and shader development, Xiao validated the patch against multiple URP shadow paths to ensure compatibility and visual consistency. This work demonstrated a strong grasp of rendering pipeline debugging and depth calculations, contributing a concise, review-ready solution that enhanced the core graphics infrastructure in Unity.