Worked on the Babylon.js repository to enhance GPU-based picking and rendering fidelity, focusing on depth-based reconstruction and accurate rendering on CSS-scaled canvases. Developed features in TypeScript and GLSL, implementing depth-derived data support in the GPUPicker and extending its API to return detailed spatial information. Introduced MultiRenderTarget depth attachments with shader guards and adaptive readback strategies to balance quality and performance. Improved coordinate mapping to align GPU results with DOM sizing, preserving default canvas behavior while increasing accuracy. Validated all changes through TypeScript builds, asset pipelines, and comprehensive unit and visualization tests to ensure stability and maintainability.