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To customize a threebox layer for use with react-map-gl, the following steps can be taken:

1. Install and import the @react-map-gl/three package, which provides components for using three.js with react-map-gl.

2. Create a new Threebox object, passing in the map instance and the container element where the layer will be rendered.

const tb = new Threebox(map, map.getCanvasContainer());

1. Create a new ThreeboxLayer object, passing in the Threebox instance, the ID for the layer, and an onClick callback function if desired.

const layer = new ThreeboxLayer(tb, 'my-layer-id', onClickFunction);

1. Add the ThreeboxLayer object to the Mapbox GL map instance using the addLayer() method.

map.addLayer(layer);

1. Customize the ThreeboxLayer by setting its properties and adding objects to it. For example, to add a 3D model, create a new ThreeboxObject and add it to the layer:

const modelUrl = 'path/to/my/model.glb';
const model = new ThreeboxObject(new GLTFLoader().load(modelUrl))
layer.add(model);

1. Finally, update the ThreeboxLayer on each frame using the update() method.

map.on('render', () => {
  layer.update();
});

By following these steps, a ThreeboxLayer can be fully customized for use with react-map-gl, allowing for the creation of interactive 3D maps.