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I3SConverter class

From-v3.0

The I3SConverter class converts a 3D Tiles tileset to I3S layer.

Usage​

import {I3SConverter} from '@loaders.gl/tile-converter';

const converter = new I3SConverter();
const tilesetJson = await converter.convert({
  inputUrl: TILESET_URL,
  outputPath: 'data',
  tilesetName: 'BatchedColors'
});

// The converted tiles are written to the specified output path
const rootTileJson = await fs.readFile('data/BatchedColors/layers/0/nodes/root/index.json', 'utf8');

Methods​

constructor()​

Constructs a new I3SConverter instance.

convert(options: object): object​

Converts a tileset to I3S SLPK format

  • options.inputUrl: string the url to read the tileset from
  • options.outputPath: string the output filename
  • options.tilesetName: string the output name of the tileset
  • options.maxDepth: number The max tree depth of conversion
  • options.egmFilePath: string location of *.pgm file to convert heights from ellipsoidal to gravity-related format or "None" to not use it. A model file can be loaded from GeographicLib https://geographiclib.sourceforge.io/html/geoid.html
  • options.token: string ION token of input tileset
  • options.draco: boolean Default: true. Whether the converter creates DRACO compressed geometry in path "layers/0/nodes/xxx/geometries/1" along with non-compressed geometry in path "layers/0/nodes/xxx/geometries/0"
  • options.mergeMaterials: boolean Default: true. Whether the converter should try to merge PBR materials. If true, the converter will try to merge PBR materials, joining textures in an atlas. This operation allows to create one I3S node for one 3DTiles tile. If one material has a texture but another doesn't have, materials are not merged and the 3DTiles tile will be splitted into 2 I3S nodes.
  • options.generateTextures: boolean Whether the converter should generate additional texture of another format. For non-compressed source texture format (JPG, PNG) the converter creates additional KTX2 texture. For compressed source texture (KTX2) the converter creates additional JPG texture. To encode and decode KTX2 Basis Universal Supercompressed GPU Texture Codec is used.
  • options.generateBoundingVolumes: boolean Whether the converter generate new bounding volumes from the mesh vertices. The default behavior is convertion bounding volumes (box, sphere or region) from 3DTiles tileset data. If this option is set true the converter will ignore source bounding volume and generate new bounding volume (oriented bounding box and minimal bounding sphere) from the geometry POSITION attribute.
  • options.instantNodeWriting: boolean Whether the converter should keep JSON resources (3DNodeIndexDocuments and nodePages) on disk during conversion. The default behavior is the converter keeps JSON resources in memory till the end of conversion. Those resources need to be updated during conversion (adding child nodes and neighbor nodes). If this option is set true the converter will keep JSON resources on disk all the time. Use this option for large datasets when the nodes tree is large and "memory overflow" error occurs. Instant node writing saves memory usage in cost of conversion speed (>2 times slower).
  • options.metadataClass: string One of the list of feature metadata classes, detected by converter on "analyze" stage
  • options.analyze: boolean Analyze the input tileset content without conversion.
  • options.validate: boolean Enable Validation.

Validation​

By specifying the --validate parameter, the tile-converter will perform checks on the tileset data. The following checks are performed:

  • Bounding volume validation
  • Refinement type validation