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<!doctype html>
<!--
Copyright 2018 The Immersive Web Community Group
Permission is hereby granted, free of charge, to any person obtaining a copy of
this software and associated documentation files (the "Software"), to deal in
the Software without restriction, including without limitation the rights to
use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
the Software, and to permit persons to whom the Software is furnished to do so,
subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
-->
<html>
<head>
<meta charset="utf-8">
<meta name='viewport' content='width=device-width, initial-scale=1, user-scalable=no'>
<meta name='mobile-web-app-capable' content='yes'>
<meta name='apple-mobile-web-app-capable' content='yes'>
<link href='../css/common.css' rel='stylesheet'>
<script async src="https://unpkg.com/es-module-shims@1.3.6/dist/es-module-shims.js"></script>
<script type="importmap">
{
"imports": {
"three": "https://unpkg.com/three@0.172.0/build/three.module.js"
}
}
</script>
<script src='../js/webxr-button.js'></script>
<title>Lighting estimation</title>
<style>
body { margin: 0; }
canvas { width: 100%; height: 100%; }
</style>
</head>
<body>
<header>
<details open>
<summary>Lighting Estimation</summary>
<p>
This sample demonstrates use of a non-exclusive XRSession to present
Augmented Reality content.
<a class="back" href="./index.html">Back</a>
<hr/>
<input id="useRGBA" type="checkbox">
<label for="useRGBA">Use RGBA Half Float Texture Format</label><br/>
</p>
</details>
</header>
<script type="module">
import * as THREE from 'three';
function init() {
const ctx = {};
// Create an xrCompatible rendering context
const canvas = document.createElement('canvas');
ctx.gl = canvas.getContext('webgl2', { xrCompatible: true });
if (!ctx.gl) {
console.error('This browser does not support WebGL2');
return;
}
ctx.gl.getExtension('EXT_sRGB');
ctx.gl.getExtension('OES_texture_half_float');
// Create a Three.js renderer
ctx.renderer = new THREE.WebGLRenderer({
canvas: canvas,
context: ctx.gl,
});
ctx.renderer.physicallyCorrectLights = true;
ctx.renderer.xr.enabled = true;
// Construct a Three.JS scene
ctx.scene = new THREE.Scene();
// Set up the lighting estimation environment map, and then setup THREE
// to accept a webgl texture.
ctx.cubeTarget = new THREE.WebGLCubeRenderTarget(16);
ctx.threeEnvMap = ctx.cubeTarget.texture;
ctx.scene.environment = ctx.threeEnvMap;
// Set up the camera
ctx.camera = new THREE.PerspectiveCamera(70, window.innerWidth / window.innerHeight, 0.01, 20 );
ctx.scene.add(ctx.camera);
// Add a sphere
ctx.geometry = new THREE.SphereGeometry(0.2, 32, 32);
ctx.material = new THREE.MeshStandardMaterial({ color: 0xFFFFFF, metalness: 1.0, roughness: 0.0 });
ctx.sphere = new THREE.Mesh(ctx.geometry, ctx.material);
ctx.scene.add(ctx.sphere);
ctx.sphere.position.z = -1;
ctx.sphere.updateMatrix();
// Set up light source
ctx.light_probe = new THREE.LightProbe();
ctx.light_probe.intensity = 0;
ctx.scene.add(ctx.light_probe);
ctx.directional_light = new THREE.DirectionalLight();
ctx.directional_light.intensity = 0;
ctx.scene.add(ctx.directional_light);
ctx.xrButton = new XRDeviceButton({
onRequestSession: () => onRequestSession(ctx),
onEndSession: session => session.end(),
textEnterXRTitle: "START AR",
textXrNotFoundTitle: "AR NOT FOUND",
textExitXRTitle: "EXIT AR",
supportedSessionTypes: ['immersive-ar'],
});
document.querySelector('header').appendChild(ctx.xrButton.domElement);
}
function onRequestSession(ctx) {
navigator.xr.requestSession('immersive-ar', {requiredFeatures: ['local', 'light-estimation']}).then(session => {
session.addEventListener('end', () => onSessionEnded(ctx));
ctx.session = session;
ctx.xrButton.setSession(session);
ctx.glBinding = new XRWebGLBinding(session, ctx.gl);
session.updateRenderState({ baseLayer: new XRWebGLLayer(session, ctx.gl) });
ctx.renderer.xr.setReferenceSpaceType('local');
ctx.renderer.xr.setSession(session).then(() => {
if (document.getElementById('useRGBA').checked) {
session.requestLightProbe({reflectionFormat: "rgba16f"}).then((lightProbe) => {
onReceivedLightProbe(ctx, lightProbe);
}).catch(err => console.error(err));
} else {
session.requestLightProbe().then((lightProbe) => {
onReceivedLightProbe(ctx, lightProbe);
}).catch(err => console.error(err));
}
ctx.reflectionChanged = true;
ctx.renderer.xr.setAnimationLoop((time, frame) => {
render(ctx, time, frame);
});
});
});
}
function onReceivedLightProbe(ctx, lightProbe) {
ctx.xrLightProbe = lightProbe;
ctx.xrLightProbe.addEventListener('reflectionchange', () => onReflectionChanged(ctx));
}
function onReflectionChanged(ctx) {
ctx.reflectionChanged = true;
}
function onSessionEnded(ctx) {
ctx.renderer.setAnimationLoop(null);
ctx.xrButton.setSession(null);
}
function render(ctx, time, frame) {
// Get ambient lighting estimation
if (frame && ctx.xrLightProbe) {
const estimate = frame.getLightEstimate(ctx.xrLightProbe);
if (estimate) {
ctx.light_probe.sh.fromArray(estimate.sphericalHarmonicsCoefficients);
ctx.light_probe.intensity = 1;
const intensityScalar =
Math.max(1.0,
Math.max(estimate.primaryLightIntensity.x,
Math.max(estimate.primaryLightIntensity.y,
estimate.primaryLightIntensity.z)));
ctx.directional_light.color.setRGB(
estimate.primaryLightIntensity.x / intensityScalar,
estimate.primaryLightIntensity.y / intensityScalar,
estimate.primaryLightIntensity.z / intensityScalar);
ctx.directional_light.intensity = intensityScalar;
ctx.directional_light.position.copy(estimate.primaryLightDirection);
} else {
console.log("light estimate not available");
}
if (ctx.reflectionChanged) {
const cubeMap = ctx.glBinding.getReflectionCubeMap(ctx.xrLightProbe);
if (cubeMap) {
let rendererProps = ctx.renderer.properties.get(ctx.threeEnvMap);
rendererProps.__webglTexture = cubeMap;
ctx.threeEnvMap.needsPMREMUpdate = true;
} else {
console.log("Cube map not available");
}
ctx.reflectionChanged = false;
}
} else {
console.log("light probe not available");
}
// Render the scene
ctx.renderer.render(ctx.scene, ctx.camera);
}
init();
</script>
</body>
</html>
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