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

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+import {
+	Mesh,
+	ShaderMaterial,
+	SphereGeometry
+} from 'three';
+
+class LightProbeHelper extends Mesh {
+
+	constructor( lightProbe, size = 1 ) {
+
+		const material = new ShaderMaterial( {
+
+			type: 'LightProbeHelperMaterial',
+
+			uniforms: {
+
+				sh: { value: lightProbe.sh.coefficients }, // by reference
+
+				intensity: { value: lightProbe.intensity }
+
+			},
+
+			vertexShader: /* glsl */`
+
+				varying vec3 vNormal;
+
+				void main() {
+
+					vNormal = normalize( normalMatrix * normal );
+
+					gl_Position = projectionMatrix * modelViewMatrix * vec4( position, 1.0 );
+
+				}
+
+			`,
+
+			fragmentShader: /* glsl */`
+
+				#define RECIPROCAL_PI 0.318309886
+
+				vec3 inverseTransformDirection( in vec3 normal, in mat4 matrix ) {
+
+					// matrix is assumed to be orthogonal
+
+					return normalize( ( vec4( normal, 0.0 ) * matrix ).xyz );
+
+				}
+
+				// source: https://graphics.stanford.edu/papers/envmap/envmap.pdf,
+				vec3 shGetIrradianceAt( in vec3 normal, in vec3 shCoefficients[ 9 ] ) {
+
+					// normal is assumed to have unit length,
+
+					float x = normal.x, y = normal.y, z = normal.z;
+
+					// band 0,
+					vec3 result = shCoefficients[ 0 ] * 0.886227;
+
+					// band 1,
+					result += shCoefficients[ 1 ] * 2.0 * 0.511664 * y;
+					result += shCoefficients[ 2 ] * 2.0 * 0.511664 * z;
+					result += shCoefficients[ 3 ] * 2.0 * 0.511664 * x;
+
+					// band 2,
+					result += shCoefficients[ 4 ] * 2.0 * 0.429043 * x * y;
+					result += shCoefficients[ 5 ] * 2.0 * 0.429043 * y * z;
+					result += shCoefficients[ 6 ] * ( 0.743125 * z * z - 0.247708 );
+					result += shCoefficients[ 7 ] * 2.0 * 0.429043 * x * z;
+					result += shCoefficients[ 8 ] * 0.429043 * ( x * x - y * y );
+					return result;
+
+				}
+
+				uniform vec3 sh[ 9 ]; // sh coefficients
+
+				uniform float intensity; // light probe intensity
+
+				varying vec3 vNormal;
+
+				void main() {
+
+					vec3 normal = normalize( vNormal );
+
+					vec3 worldNormal = inverseTransformDirection( normal, viewMatrix );
+
+					vec3 irradiance = shGetIrradianceAt( worldNormal, sh );
+
+					vec3 outgoingLight = RECIPROCAL_PI * irradiance * intensity;
+
+					gl_FragColor = linearToOutputTexel( vec4( outgoingLight, 1.0 ) );
+
+				}
+
+			`,
+
+		} );
+
+		const geometry = new SphereGeometry( 1, 32, 16 );
+
+		super( geometry, material );
+
+		this.lightProbe = lightProbe;
+		this.size = size;
+		this.type = 'LightProbeHelper';
+
+		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.material.uniforms.intensity.value = this.lightProbe.intensity;
+
+	}
+
+}
+
+export { LightProbeHelper };