One material.
Many uniforms.

Each mesh owns a color property, while one shared node material reads an object-scoped uniform updated by a custom Node. The lab makes that ownership visible beside a CPU material reference.

backend

—

meshes

—

geometry

—

material

—

uniform updates

—

sample avg/p95

—

The official cube-map texture, exact twelve-teapot presentation, Inspector/Stats UI, device/compiler matrix, and whole-example fidelity remain separate boundaries. The WebGL2 lane is an explicit CPU-owned material reference.