Frame the camera on ONE object subtree (per-layer "frame camera" — the
subtree sibling of centerCameraOnScene). Returns the new look-at
center, or null when the subtree holds no framable geometry (e.g. a
partition whose parts have not streamed in yet).
Frame the camera on ONE object subtree (per-layer "frame camera" — the subtree sibling of centerCameraOnScene). Returns the new look-at center, or null when the subtree holds no framable geometry (e.g. a partition whose parts have not streamed in yet).