Tile Converter - 3DTiles to I3S conversion

[valuecreation]

Converting from the above 3DTiles (with texture) to I3S results in an error.

3D Tiles of 3D Urban Model (Project PLATEAU) Chuo Ward, Tokyo (FY2023)
https://www.geospatial.jp/ckan/dataset/plateau-13102-chuo-ku-2023/resource/ea860e04-2aa4-43a3-9df1-bb75b42edbfe

Error message “EXT_texture_webp not supported” appears when converting with textured data. This situation is currently not supported. We hope it will be supported in the future.

docker run --rm -v ${PWD}:/3DTiles visgl/tile-converter --input-type 3dtiles --tileset /3DTiles/13102_chuo-ku_city_2023_3dtiles_mvt_1_op/13102_chuo-ku_pref_2023_citygml_1_op_bldg_3dtiles_13102_chuo-ku_lod2/tileset.json --name 13102_chuo-ku_pref_2023_lod2 --output /3DTiles/I3S --slpk
WARNING: The requested image's platform (linux/arm64/v8) does not match the detected host platform (linux/amd64/v3) and no specific platform was requested
Input tileset value: /3DTiles/13102_chuo-ku_city_2023_3dtiles_mvt_1_op/13102_chuo-ku_pref_2023_citygml_1_op_bldg_3dtiles_13102_chuo-ku_lod2/tileset.json
Modified tileset value: /3DTiles/13102_chuo-ku_city_2023_3dtiles_mvt_1_op/13102_chuo-ku_pref_2023_citygml_1_op_bldg_3dtiles_13102_chuo-ku_lod2/tileset.json
------------------------------------------------
Starting conversion of 3dtiles
------------------------------------------------
Loading egm file...
Loading egm file completed!
Analyze source tileset
[analyze]: /3DTiles/13102_chuo-ku_city_2023_3dtiles_mvt_1_op/13102_chuo-ku_pref_2023_citygml_1_op_bldg_3dtiles_13102_chuo-ku_lod2/data/data232.b3dm
Error: gltf: Required extension EXT_texture_webp not supported by browser
    at Object.xEt (/loaders-bundle/converter.min.cjs:160:285449)
    at ibe (/loaders-bundle/converter.min.cjs:160:292930)
    at fbe (/loaders-bundle/converter.min.cjs:160:296984)
    at Object.oAt [as parse] (/loaders-bundle/converter.min.cjs:160:299468)
    at mbt (/loaders-bundle/converter.min.cjs:160:118193)
    at process.processTicksAndRejections (node:internal/process/task_queues:95:5)
    at async Va (/loaders-bundle/converter.min.cjs:160:117695)
    at async EEe (/loaders-bundle/converter.min.cjs:160:406805)
    at async yv.analyzeTile (/loaders-bundle/converter.min.cjs:160:422619)
    at async xC (/loaders-bundle/converter.min.cjs:160:406435)

[ibgreen]

FWIW, there is some code for handling this extension, perhaps it could be used by the converter:

loaders.gl/modules/gltf/src/lib/extensions/EXT_texture_webp.ts

Line 20 in d74df44

export function preprocess(gltfData: {json: GLTF}, options: GLTFLoaderOptions): void {