invalidate

Marks the cached world transform and ray-intersection geometry stale so they are rebuilt on the next render/pick. Assigning position, altitudeMode, the rotation/translation/scale properties already calls this; invoke it manually only after mutating one of them in place — e.g. correcting a KMZ model's altitude via scene.position.altitude += offset; scene.invalidate(). Terrain inputs (vertical exaggeration, and for terrain-relative modes the elevation timestamp / globe state) trigger it automatically via checkTerrainState so the model follows the resolved terrain.