Function convergeGeometryOntoRtcAnchor

convergeGeometryOntoRtcAnchor<T extends RtcRebaseGeometry>(
    geometries: readonly T[],
    anchor: Readonly<Vec3>,
    hasOtherInstancedGeometry?: (geometry: T) => boolean,
): RtcConvergeResult<T>
Move every geometry that is not yet drawn against anchor onto it, in place: each mesh's origin and the CoordinateInfo frame fields change, positions never do. Geometries already on the anchor and point clouds are left alone; GPU-instanced geometries are reported in refused and left untouched, so the caller can tell the user which models stay split.

Idempotent: a second call with the same anchor moves nothing.
Type Parameters
- T extends RtcRebaseGeometry
Parameters
- geometries: readonly T[]
- anchor: Readonly<Vec3>
- OptionalhasOtherInstancedGeometry: (geometry: T) => boolean
  Extra instancing evidence the caller holds outside the geometry (e.g. shards already handed to the renderer); true refuses the geometry.
Returns RtcConvergeResult<T>