Worked on the Unity-Technologies/Graphics repository to generalize the OnDrawCommand system for BatchRendererGroup, enabling support for multiple draw types and improving both picking and outline functionality across all configurations. The approach involved introducing an immutable BatchDrawCommandRef, which enhanced correctness in material selection, draw skipping, and submesh index handling. This refactor improved the maintainability and robustness of the rendering pipeline, ensuring smoother editor interactions and laying groundwork for future feature development. The work was implemented using C# and leveraged expertise in graphics programming and rendering within the Unity Engine, focusing on correctness and extensibility rather than addressing bug fixes.