Tile3DLayer: small gaps between tiles

[xintongxia]

Description

Repro Steps

• go to website/3d-tiles
• change the _ionAssetId provided to Tile3DLayer to 29328
• start the app (yarn start-local) and zoom in

  _renderTile3DLayer() {
    return new Tile3DLayer({
      id: 'tile-3d-layer',
      _ionAssetId: 29328,
      _ionAccessToken: ION_TOKEN,
      pointSize: 2,
      onTilesetLoad: this._onTilesetLoad
    });
  }

But if convert the positions to lnglats, the gaps will be gone, see code from branch xx/debug-tiles

Environment (please complete the following information):

• Framework Version: deck.gl 8.0.0, loaders.gl 2.0.3
• Browser Version: chrome 80.0.3987.87
• OS: Mac OS 10.15.2

Logs

[Pessimistress]

This is expected as the precision error in meter-offset mode. We will likely need to implement native fixed-frame support to fully resolve this.

#4104

[charlieforward9]

pretty sure this is fixed - even more so in GlobeView after landing #10252