Type Alias SceneModelLoadingMode

SceneModelLoadingMode: "open" | "streaming"

Describes how a SceneModel's topology is expected to be populated before it is sealed.

open and streaming both allow component creation and commitBatch. The difference is intent: open is ordinary ad-hoc authoring, while streaming tells renderers that committed batches are expected to keep arriving over time.

The terminal closed state is represented by sealed, not by changing this loading mode.