Worked on the google/filament repository to enhance platform stability and cross-driver compatibility for instanced rendering materials. Addressed a WebGL issue by implementing an ANGLE-on-D3D11 compatibility workaround, introducing a flag that rewrites symbolic array lengths to literals for spec-constant-initialized uniform-block arrays, ensuring correct binding across platforms. Fixed a divide-by-zero bug in colored penumbra calculations by clamping the divisor with a small epsilon, which prevents invalid renders without affecting valid shading. Utilized C++, OpenGL, and GLSL to align runtime bindings with device expectations, reduce rendering artifacts, and document changes for easier review and future compatibility improvements.