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web-app/node_modules/three/examples/jsm/helpers/LightProbeHelperGPU.js

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+import {
+	Mesh,
+	NodeMaterial,
+	SphereGeometry
+} from 'three';
+import { float, Fn, getShIrradianceAt, normalWorld, uniformArray, uniform, vec4 } from 'three/tsl';
+
+class LightProbeHelper extends Mesh {
+
+	constructor( lightProbe, size = 1 ) {
+
+		const sh = uniformArray( lightProbe.sh.coefficients );
+		const intensity = uniform( lightProbe.intensity );
+
+		const RECIPROCAL_PI = float( 1 / Math.PI );
+
+		const fragmentNode = Fn( () => {
+
+			const irradiance = getShIrradianceAt( normalWorld, sh );
+
+			const outgoingLight = RECIPROCAL_PI.mul( irradiance ).mul( intensity );
+
+			return vec4( outgoingLight, 1.0 );
+
+		} )();
+
+		const material = new NodeMaterial();
+		material.fragmentNode = fragmentNode;
+
+		const geometry = new SphereGeometry( 1, 32, 16 );
+
+		super( geometry, material );
+
+		this.lightProbe = lightProbe;
+		this.size = size;
+		this.type = 'LightProbeHelper';
+
+		this._intensity = intensity;
+		this._sh = sh;
+
+		this.onBeforeRender();
+
+	}
+
+	dispose() {
+
+		this.geometry.dispose();
+		this.material.dispose();
+
+	}
+
+	onBeforeRender() {
+
+		this.position.copy( this.lightProbe.position );
+
+		this.scale.set( 1, 1, 1 ).multiplyScalar( this.size );
+
+		this._intensity.value = this.lightProbe.intensity;
+		this._sh.array = this.lightProbe.sh.coefficients;
+
+	}
+
+}
+
+export { LightProbeHelper };