B3dm
Decoded b3dm payload: the embedded glTF + feature table (for RTC_CENTER + optional gltfUpAxis override) + the batch table. The renderer applies rtcCenter as an extra translation when present — per spec, b3dm authors may offset every vertex by a tile- relative center to keep numerical precision tight at city scale.
Properties
Batch length (number of features). 0 when the payload is a single un-batched mesh.
Parsed batch table mapping batchId → properties for per-feature picking. Null when the payload has no batch table or batchLength == 0.
gltfUpAxis override declared in the feature-table JSON: takes precedence over the tileset-level asset.gltfUpAxis. Null when absent — the layer falls through to the tileset declaration, then to its default.
RTC_CENTER in the b3dm feature table, or null when the asset is already in tile-local coordinates. Length 3 (x, y, z).