The layer is updated when the style changes.

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index.js
import { Color, MathUtils } from 'three';
import { MapControls } from 'three/examples/jsm/controls/MapControls.js';

import { Feature } from 'ol';
import { LineString, Point, Polygon } from 'ol/geom.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';

/**
 * Binds a button.
 * @param {string} id The id of the <button> element.
 * @param {() => void} onClick The click handler.
 */
function bindButton(id, onClick) {
    document.getElementById(id).onclick = () => {
        onClick();
    };
}

/**
 * Binds a toggle switch or checkbox.
 * @param {string} id The id of the <input> element.
 * @param {(v: boolean) => void} onChange The callback when the dropdown value changes.
 * @returns {(v: boolean) => void} The function to update the value from outside.
 */
function bindToggle(id, onChange) {
    /** @type {HTMLInputElement} */
    const toggle = document.getElementById(id);

    toggle.oninput = function oninput() {
        onChange(toggle.checked);
    };

    return v => {
        toggle.checked = v;
        onChange(toggle.checked);
    };
}

/**
 * Binds a {@link HTMLInputElement} in slider mode.
 * @param {string} id The id of the <input> element.
 * @param {(v: number) => void} onChange The callback when the slider value changes.
 * @returns {(v: number) => void} The function to update the value from outside.
 */
function bindSlider(id, onChange) {
    /** @type {HTMLInputElement} */
    const slider = document.getElementById(id);
    slider.oninput = function oninput() {
        onChange(slider.valueAsNumber);
    };

    return v => {
        slider.valueAsNumber = v;
        onChange(slider.valueAsNumber);
    };
}

// Defines geographic extent: CRS, min/max X, min/max Y
const extent = Extent.fromCenterAndSize('EPSG:3857', { x: 11393552, y: 44035 }, 1000000, 500000);

// `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);

const fillColor = new Color('orange');
const strokeColor = new Color('red');

const image = new Circle({
    radius: 20,
    fill: new Fill({
        color: `#${fillColor.getHexString()}`,
    }),
    stroke: new Stroke({
        color: `#${strokeColor.getHexString()}`,
        width: 5,
    }),
});

const fill = new Fill({
    color: `#${fillColor.getHexString()}`,
});

const stroke = new Stroke({
    color: `#${strokeColor.getHexString()}`,
    width: 5,
});

let style = new Style({
    fill,
    stroke,
    image,
});

const polygon = new Feature(
    new Polygon([
        [
            [100.0, 0.0],
            [101.0, 0.0],
            [101.0, 1.0],
            [100.0, 1.0],
            [100.0, 0.0],
        ],
    ]).transform('EPSG:4326', 'EPSG:3857'),
);

const line = new Feature(
    new LineString([
        [102.0, 0.0],
        [103.0, 1.0],
        [104.0, 0.0],
        [105.0, 1.0],
    ]).transform('EPSG:4326', 'EPSG:3857'),
);

const point = new Feature(new Point([102.0, 0.5]).transform('EPSG:4326', 'EPSG:3857'));

const source = new VectorSource({
    data: [],
    dataProjection: 'EPSG:3857',
    style,
});

const layer = new ColorLayer({ source });

map.addLayer(layer);

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

instance.notifyChange(map);

source.source.addFeatures([point, line, polygon]);

const setStrokeWidth = bindSlider('stroke-width', v => {
    style.getStroke().setWidth(v);
    style.getImage().getStroke().setWidth(v);
    style.getImage().setRadius(style.getImage().getRadius());
    layer.source.update();
});
const setPointRadius = bindSlider('point-radius', v => {
    style.getImage().setRadius(v);
    style.setImage(style.getImage());
    layer.source.update();
});
const setOpacity = bindSlider('style-opacity', v => {
    style
        .getImage()
        .getStroke()
        .setColor(
            `rgba(${strokeColor.r * 255}, ${strokeColor.g * 255}, ${strokeColor.b * 255}, ${v})`,
        );
    style
        .getImage()
        .getFill()
        .setColor(`rgba(${fillColor.r * 255}, ${fillColor.g * 255}, ${fillColor.b * 255}, ${v})`);
    style
        .getStroke()
        .setColor(
            `rgba(${strokeColor.r * 255}, ${strokeColor.g * 255}, ${strokeColor.b * 255}, ${v})`,
        );
    style
        .getFill()
        .setColor(`rgba(${fillColor.r * 255}, ${fillColor.g * 255}, ${fillColor.b * 255}, ${v})`);

    style.getImage().setRadius(style.getImage().getRadius());

    layer.source.update();
});

bindToggle('show-line', v => {
    if (v) {
        source.source.addFeature(line);
    } else {
        source.source.removeFeature(line);
    }
    source.update();
});
bindToggle('show-polygon', v => {
    if (v) {
        source.source.addFeature(polygon);
    } else {
        source.source.removeFeature(polygon);
    }
    source.update();
});
bindToggle('show-point', v => {
    if (v) {
        source.source.addFeature(point);
    } else {
        source.source.removeFeature(point);
    }
    source.update();
});

bindButton('randomize', () => {
    strokeColor.r = MathUtils.randFloat(0, 1);
    strokeColor.g = MathUtils.randFloat(0, 1);
    strokeColor.b = MathUtils.randFloat(0, 1);

    fillColor.r = MathUtils.randFloat(0, 1);
    fillColor.g = MathUtils.randFloat(0, 1);
    fillColor.b = MathUtils.randFloat(0, 1);

    const pointRadius = MathUtils.randFloat(0.1, 20);
    const strokeWidth = MathUtils.randFloat(1, 20);
    const opacity = MathUtils.randFloat(0, 1);

    const newStyle = new Style({
        fill: new Fill({
            color: `rgba(${fillColor.r * 255}, ${fillColor.g * 255}, ${fillColor.b * 255}, ${opacity})`,
        }),
        stroke: new Stroke({
            color: `rgba(${strokeColor.r * 255}, ${strokeColor.g * 255}, ${strokeColor.b * 255}, ${opacity})`,
            width: strokeWidth,
        }),
        image: new Circle({
            radius: pointRadius,
            fill: new Fill({
                color: `rgba(${fillColor.r * 255}, ${fillColor.g * 255}, ${fillColor.b * 255}, ${opacity})`,
            }),
            stroke: new Stroke({
                color: `rgba(${strokeColor.r * 255}, ${strokeColor.g * 255}, ${strokeColor.b * 255}, ${opacity})`,
                width: strokeWidth,
            }),
        }),
    });

    setPointRadius(pointRadius);
    setStrokeWidth(strokeWidth);
    setOpacity(opacity);

    style = newStyle;

    // Here we test that setStyle() takes the new style into account
    // and that the layer is repainted.
    source.setStyle(newStyle);
});
index.html
<!doctype html>
<html lang="en">
    <head>
        <title>Dynamic layer updates</title>
        <meta charset="UTF-8" />
        <meta name="name" content="layer_update" />
        <meta name="description" content="The layer is updated when the style changes." />
        <meta name="viewport" content="width=device-width, initial-scale=1.0" />

        <link rel="icon" href="https://giro3d.org/images/favicon.svg" />
        <link href="https://giro3d.org/assets/bootstrap-custom.css" rel="stylesheet" />
        <script src="https://giro3d.org/assets/bootstrap.bundle.min.js"></script>
        <link
            rel="stylesheet"
            type="text/css"
            href="https://giro3d.org/latest/css/example.css"
        />

        
    </head>

    <body>
        <div id="viewerDiv" class="m-0 p-0 w-100 h-100"></div>
        <div id="panelDiv" class="position-absolute top-0 start-0 mh-100 overflow-auto"></div>

        <div class="side-pane-with-status-bar">
            <!-- Top color layer -->
            <div class="card">
                <div class="card-header">Options</div>

                <div class="card-body" id="top-options">
                    <!-- Show point -->
                    <div class="input-group my-2">
                        <div>
                            <div class="form-check form-switch">
                                <input
                                    class="form-check-input"
                                    checked
                                    type="checkbox"
                                    role="switch"
                                    id="show-point"
                                    autocomplete="off"
                                />
                                <label class="form-check-label" for="show-point">Show point</label>
                            </div>
                        </div>
                    </div>

                    <!-- Show polygon -->
                    <div class="input-group my-2">
                        <div>
                            <div class="form-check form-switch">
                                <input
                                    class="form-check-input"
                                    checked
                                    type="checkbox"
                                    role="switch"
                                    id="show-polygon"
                                    autocomplete="off"
                                />
                                <label class="form-check-label" for="show-polygon">Show polygon</label>
                            </div>
                        </div>
                    </div>

                    <!-- Show line -->
                    <div class="input-group my-2">
                        <div>
                            <div class="form-check form-switch">
                                <input
                                    class="form-check-input"
                                    checked
                                    type="checkbox"
                                    role="switch"
                                    id="show-line"
                                    autocomplete="off"
                                />
                                <label class="form-check-label" for="show-line">Show line</label>
                            </div>
                        </div>
                    </div>

                    <!-- Stroke width -->
                    <div class="input-group my-2">
                        <label for="stroke-width" class="form-label">Stroke width</label>
                        <div class="input-group">
                            <input
                                type="range"
                                min="1"
                                step="1"
                                max="20"
                                value="10"
                                class="form-range"
                                id="stroke-width"
                                autocomplete="off"
                            />
                        </div>
                    </div>

                    <!-- Point radius -->
                    <div class="input-group my-2">
                        <label for="point-radius" class="form-label">Point radius</label>
                        <div class="input-group">
                            <input
                                type="range"
                                min="0.1"
                                step="0.05"
                                max="20"
                                value="1.5"
                                class="form-range"
                                id="point-radius"
                                autocomplete="off"
                            />
                        </div>
                    </div>

                    <!-- Style opacity -->
                    <div class="input-group my-2">
                        <label for="style-opacity" class="form-label">Style opacity</label>
                        <div class="input-group">
                            <input
                                type="range"
                                min="0"
                                step="0.05"
                                max="1"
                                value="1"
                                class="form-range"
                                id="style-opacity"
                                autocomplete="off"
                            />
                        </div>
                    </div>

                    <hr />

                    <!-- Randomize style -->
                    <button type="button" class="btn btn-primary w-100" id="randomize">
                        Randomize style
                    </button>
                </div>
            </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": "0.37.2"
    },
    "devDependencies": {
        "vite": "^3.2.3"
    },
    "scripts": {
        "start": "vite",
        "build": "vite build"
    }
}