Class CoordinateHandler

Calculate bounding box from all meshes (filtering out corrupted values)

Calculate centroid (center point) from bounds

Get current coordinate info (for incremental updates)

Get final coordinate info after incremental processing

Get current origin shift

Check if coordinate shift is needed

Process meshes: detect large coordinates and shift if needed

Process a batch using authoritative WASM metadata when available.

Native buffer streaming and adaptive native processing have no pre-pass decision and retain the legacy first-vertex vote. WASM callers set their authoritative frame first through setWasmMetadata.

Fast incremental path for trusted native batches.

Desktop native streaming already emits site-local coordinates, so the JS layer does not need to re-run RTC detection, outlier filtering, or position shifting for every vertex. We only need lightweight bounds accumulation so the viewport can fit the camera while streaming.

Reset incremental state (for new file)

Record the world→render metadata the WASM pre-pass resolved for this model (issue #945): the length-unit scale and the RTC offset the mesh path actually subtracted. Pass rtcOffset: null when no shift was applied. Surfaced on the returned CoordinateInfo so external viewers can map externally-resolved geometry into the render frame. Exact provenance is strict. For compatibility, a legacy two-argument call with a non-finite offset remains non-throwing but publishes no wasmRtcFrame.

Shift bounds by subtracting origin shift

Shift positions in-place by subtracting origin shift Corrupted values are set to 0 (center of shifted coordinate system)

Convert world coordinates to local (shifted) coordinates

Convert local (shifted) coordinates back to world coordinates