flywave-3dtile-datasource.tilesrendererbase

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TilesRendererBase class

Base class for 3D Tiles renderers with core functionality for loading, managing, and rendering tilesets.

This class provides the foundational infrastructure for 3D Tiles rendering, including: - Tile loading and management using LRU cache - Hierarchical tile traversal and refinement - Priority-based downloading and parsing queues - Memory management and resource disposal - Event dispatching for loading progress and errors

Signature:

export declare class TilesRendererBase 

Constructors

Constructor	Modifiers	Description
(constructor)(url)		Creates a new TilesRendererBase instance

Properties

Property	Modifiers	Type	Description
activeTiles	readonly	Set<ITile>	Set of currently active tiles
displayActiveTiles		boolean	Whether to display active tiles
downloadQueue	readonly	PriorityQueue<ITile>	Priority queue for tile downloads
dracoPath	protected readonly	string | undefined
errorTarget		number	Error target for level-of-detail calculations
errorThreshold		number	Gets the error threshold (deprecated)
fetchOptions	protected	RequestInit	Fetch options for tile requests
frameCount		number	Frame counter for tracking updates
loadProgress	readonly	number	Gets the current loading progress (0 to 1)
lruCache	readonly	LRUCache<ITile>	LRU cache for tile management
maxDepth		number	Maximum depth for tile traversal
parseQueue	readonly	PriorityQueue<ITile>	Priority queue for tile parsing
preprocessURL?		(url: string, parent?: ITile) => string	(Optional) Optional URL preprocessing function
processNodeQueue	readonly	PriorityQueue<ITile>	Priority queue for node processing
root	readonly	ITile | null	Gets the root tile of the tileset
rootTileSet	protected	TileSet | null	Root tileset object
stats		Stats	Statistics object for tracking tile loading and rendering status
usedSet	readonly	Set<ITile>	Set of currently used tiles
visibleTiles	readonly	Set<ITile>	Set of currently visible tiles

Methods

Method	Modifiers	Description
calculateTileViewError(tile, target)		Calculates the screen space error for a tile
dispatchEvent(e)		Dispatches an event (to be overridden by subclasses)
dispose()		Disposes of all resources This function cleans up all tiles and resets statistics.
disposeTile(tile)		Disposes of tile resources
ensureChildrenArePreprocessed(tile, immediate)		Ensures children tiles are preprocessed
fetchSubtreeTile(url, fetchOptions)		Fetches subtree data from a URL
fetchTileContent(url, fetchOptions)		Fetches tile content from a URL
fetchTileJson(url, fetchOptions)		Fetches tileset JSON data from a URL
loadRootTileSet()	protected	Loads the root tileset
markTileUsed(tile)		Marks a tile as used (preventing it from being unloaded)
parseTile(content, tile, extension, uri, signal)		Parses tile content
parseTileSubtree(content, tile, extension, uri, signal)	protected	Parses subtree tile content
preprocessNode(tile, tileSetDir, parentTile)		Preprocesses a tile node This function initializes tile properties and prepares the tile for rendering.
queueTileForDownload(tile)		Queues a tile for download
resetFailedTiles()		Resets tiles that failed to load This function resets the loading state of failed tiles and the root tileset so they can be retried.
setTileActive(tile, active)		Sets a tile's active state
setTileVisible(tile, visible)		Sets a tile's visibility state
traverse(beforecb, aftercb, ensureFullyProcessed)		Traverses the tile hierarchy
update()		Main update function that should be called every frame This function performs the core tile loading and rendering logic: - Loads the root tileset if not already loaded - Updates tile states based on camera visibility - Loads queued tiles - Unloads unused tiles - Dispatches events for loading progress