Interface BakedLightmapDoc

A baked-lightmap volume (Godot LightmapGI equivalent). atlas is the project-root-relative POSIX path of the tall, vertically-sliced lightmap EXR (each slice sliceHeight texels tall, stacked into a 2D-array texture); mapping points at the lightmap_users.json produced from the Godot bake (per-instance node name → atlas slice + UV rect). At runtime the overlay is additively composited over the lit HDR for every sibling/scene GltfModelDoc whose nodes match the mapping. See the lightmap_level sample for the standalone reference.