The layer is updated when the style changes.

100%

index.js
import { Color, MathUtils } from 'three';
import { MapControls } from 'three/examples/jsm/controls/MapControls.js';
import { GeoJSON } from 'ol/format.js';
import { Circle, Fill, Stroke, Style } from 'ol/style.js';

import ColorLayer from '@giro3d/giro3d/core/layer/ColorLayer.js';
import Extent from '@giro3d/giro3d/core/geographic/Extent.js';
import Instance from '@giro3d/giro3d/core/Instance.js';
import Map from '@giro3d/giro3d/entities/Map.js';
import VectorSource from '@giro3d/giro3d/sources/VectorSource.js';
import Inspector from '@giro3d/giro3d/gui/Inspector.js';



// Defines geographic extent: CRS, min/max X, min/max Y
const extent = Extent.fromCenterAndSize('EPSG:3857', { x: 11393552, y: 44035 }, 1000000, 1000000);

// `viewerDiv` will contain Giro3D' rendering area (the canvas element)
const viewerDiv = document.getElementById('viewerDiv');

// Creates a Giro3D instance
const instance = new Instance(viewerDiv, {
    crs: extent.crs(),
    renderer: {
        clearColor: 0xffffff,
    },
});

// Instanciates camera
const center = extent.centerAsVector3();
instance.camera.camera3D.position.set(center.x, center.y - 1, 1000000);

// Creates controls
const controls = new MapControls(instance.camera.camera3D, viewerDiv);

// Then looks at extent's center
controls.target = center;
controls.saveState();

instance.useTHREEControls(controls);

const map = new Map('map', { extent });
instance.add(map);

// Creates a custom vector layer
const features = {
    type: 'FeatureCollection',
    features: [
        {
            type: 'Feature',
            geometry: {
                type: 'Point',
                coordinates: [102.0, 0.5],
            },
            properties: {
                prop0: 'value0',
            },
        },
        {
            type: 'Feature',
            geometry: {
                type: 'LineString',
                coordinates: [
                    [102.0, 0.0],
                    [103.0, 1.0],
                    [104.0, 0.0],
                    [105.0, 1.0],
                ],
            },
            properties: {
                prop0: 'value0',
                prop1: 0.0,
            },
        },
        {
            type: 'Feature',
            geometry: {
                type: 'Polygon',
                coordinates: [
                    [
                        [100.0, 0.0],
                        [101.0, 0.0],
                        [101.0, 1.0],
                        [100.0, 1.0],
                        [100.0, 0.0],
                    ],
                ],
            },
            properties: {
                prop0: 'value0',
                prop1: { this: 'that' },
            },
        },
    ],
};

const style = new Style({
    fill: new Fill({
        color: 'cyan',
    }),
    stroke: new Stroke({
        color: 'orange',
        width: 5,
    }),
    image: new Circle({
        radius: 20,
        fill: new Fill({
            color: 'orange',
        }),
        stroke: new Stroke({
            color: 'black',
            width: 5,
        }),
    }),
});

const source = new VectorSource({
    format: new GeoJSON(),
    data: features,
    dataProjection: 'EPSG:4326',
    style,
});

const layer = new ColorLayer({
    name: 'geojson',
    extent,
    source,
});

map.addLayer(layer);



Inspector.attach(document.getElementById('panelDiv'), instance);

instance.notifyChange(map);

function bindSlider(id, fn) {
    const slider = document.getElementById(id);
    slider.oninput = function oninput() {
        fn(slider.value);
        layer.source.update();
    };
}

let currentStyle = style;

bindSlider('thicknessSlider', v => currentStyle.getStroke().setWidth(v));
bindSlider('iconScaleSlider', v => currentStyle.getImage().setRadius(v));
bindSlider('iconOpacitySlider', v => currentStyle.getImage().setOpacity(v));

const button = document.getElementById('changeStyleBtn');
button.onclick = () => {
    function randomColor() {
        const color = new Color(
            MathUtils.randFloat(0, 1),
            MathUtils.randFloat(0, 1),
            MathUtils.randFloat(0, 1),
        );

        return `#${color.getHexString()}`;
    }

    const newStyle = new Style({
        fill: new Fill({
            color: randomColor(),
        }),
        stroke: new Stroke({
            color: randomColor(),
            width: MathUtils.randInt(1, 20),
        }),
        image: new Circle({
            radius: 20,
            fill: new Fill({
                color: randomColor(),
            }),
            stroke: new Stroke({
                color: randomColor(),
                width: MathUtils.randInt(1, 10),
            }),
        }),
    });
    // Here we test that setStyle() takes the new style into account
    // and that the layer is repainted.
    source.setStyle(newStyle);
    currentStyle = newStyle;
};
index.html
<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <title>Giro3D - Dynamic layer updates</title>
  <link href="https://cdn.jsdelivr.net/npm/bootstrap@5.3.2/dist/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-T3c6CoIi6uLrA9TneNEoa7RxnatzjcDSCmG1MXxSR1GAsXEV/Dwwykc2MPK8M2HN" crossorigin="anonymous">
  <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/bootstrap-icons@1.11.3/font/bootstrap-icons.min.css">
  <script src="https://cdn.jsdelivr.net/npm/bootstrap@5.3.2/dist/js/bootstrap.bundle.min.js" integrity="sha384-C6RzsynM9kWDrMNeT87bh95OGNyZPhcTNXj1NW7RuBCsyN/o0jlpcV8Qyq46cDfL" crossorigin="anonymous"></script>
  <style>
    body {
      padding: 0;
      margin: 0;
      width: 100vw;
      height: 100vh;
    }

    #viewerDiv {
      width: 100%;
      height: 100%;
    }

    #panelDiv {
      position: absolute;
      top: 0;
      left: 0;
    }
    
  </style>
</head>

<body>
  <div id="viewerDiv"></div>
  <div id="panelDiv"></div>
  <div class="m-2 position-absolute top-0 end-0">
    <div class="card m-1">
        <fieldset class="container m-1" id="styleOptions">
            <label for="thicknessSlider" class="form-label">Line thickness</label>
            <div class="input-group">
                <input
                    type="range"
                    min="0"
                    max="10"
                    value="1"
                    class="form-range"
                    id="thicknessSlider"
                    autocomplete="off"
                />
            </div>

            <div class="my-2"></div>

            <label for="iconScaleSlider" class="form-label">Icon radius</label>
            <div class="input-group">
                <input
                    type="range"
                    min="1"
                    max="100"
                    value="1"
                    step="1"
                    class="form-range"
                    id="iconScaleSlider"
                    autocomplete="off"
                />
            </div>

            <label for="iconOpacitySlider" class="form-label">Icon opacity</label>
            <div class="input-group">
                <input
                    type="range"
                    min="0"
                    max="1"
                    value="1"
                    step="0.05"
                    class="form-range"
                    id="iconOpacitySlider"
                    autocomplete="off"
                />
            </div>

            <div class="my-4"></div>

            <!-- Assign new style -->
            <button type="button" class="btn btn-primary" id="changeStyleBtn">
                Assign random style
            </button>
        </fieldset>
    </div>
</div>

  <script type="module" src="index.js"></script>
  <script>
    /* activate popovers */
    const popoverTriggerList = [].slice.call(document.querySelectorAll('[data-bs-toggle="popover"]'));
    popoverTriggerList.map(
      // bootstrap is used as script in the template, disable warning about undef
      // eslint-disable-next-line no-undef
      popoverTriggerEl => new bootstrap.Popover(popoverTriggerEl, {
        trigger: 'hover',
        placement: 'left',
        content: document.getElementById(popoverTriggerEl.getAttribute('data-bs-content')).innerHTML,
        html: true,
      }),
    );
  </script>
</body>

</html>
package.json
{
  "name": "layer_update",
  "dependencies": {
    "@giro3d/giro3d": "0.36.0",
    "colormap": "^2.3.2",
    "@turf/turf": "^6.5.0"
  },
  "devDependencies": {
    "vite": "^3.2.3"
  },
  "scripts": {
    "start": "vite",
    "build": "vite build"
  }
}