API Reference > imodeljs-frontend > Tiles > TileTreeParams > modelId modelId modelId: string A 64-bit identifier for the tile tree, unique within the context of its IModelConnection. For a tile tree associated with a GeometricModelState, this is the Id of the model. Other types of tile trees typically use a transient Id obtained from IModelConnection.transientIds. Defined in core/frontend/src/tile/TileTreeParams.ts Line 26 Last Updated: 12 June, 2024