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+<!doctype html>
+<html>
+<head>
+ <meta charset="UTF-8">
+ <meta name="viewport"
+ content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
+ <title>Cube Demo</title>
+
+ <!-- three.js -->
+ <script src="https://unpkg.com/three@0.126.0/build/three.js"></script>
+</head>
+<body>
+
+<!-- Starting an immersive WebXR session requires user interaction.
+ We start this one with a simple button. -->
+<button onclick="activateXR()">Start Cube Demo</button>
+<script>
+async function activateXR() {
+ // Add a canvas element and initialize a WebGL context that is compatible with WebXR.
+ const canvas = document.createElement("canvas");
+ document.body.appendChild(canvas);
+ const gl = canvas.getContext("webgl", {xrCompatible: true});
+
+ const scene = new THREE.Scene();
+
+// The cube will have a different color on each side.
+const materials = [
+ new THREE.MeshBasicMaterial({color: 0xff0000}),
+ new THREE.MeshBasicMaterial({color: 0x0000ff}),
+ new THREE.MeshBasicMaterial({color: 0x00ff00}),
+ new THREE.MeshBasicMaterial({color: 0xff00ff}),
+ new THREE.MeshBasicMaterial({color: 0x00ffff}),
+ new THREE.MeshBasicMaterial({color: 0xffff00})
+];
+
+// Create the cube and add it to the demo scene.
+const cube = new THREE.Mesh(new THREE.BoxBufferGeometry(0.5, 0.5, 0.5), materials);
+cube.position.set(0, 0, -1);
+scene.add(cube);
+
+// Set up the WebGLRenderer, which handles rendering to the session's base layer.
+const renderer = new THREE.WebGLRenderer({
+ alpha: true,
+ preserveDrawingBuffer: true,
+ canvas: canvas,
+ context: gl
+});
+renderer.autoClear = false;
+
+// The API directly updates the camera matrices.
+// Disable matrix auto updates so three.js doesn't attempt
+// to handle the matrices independently.
+const camera = new THREE.PerspectiveCamera();
+camera.matrixAutoUpdate = false;
+
+// Initialize a WebXR session using "immersive-ar".
+const session = await navigator.xr.requestSession("immersive-ar");
+session.updateRenderState({
+ baseLayer: new XRWebGLLayer(session, gl)
+});
+
+// A 'local' reference space has a native origin that is located
+// near the viewer's position at the time the session was created.
+const referenceSpace = await session.requestReferenceSpace('local');
+
+// Create a render loop that allows us to draw on the AR view.
+const onXRFrame = (time, frame) => {
+ // Queue up the next draw request.
+ session.requestAnimationFrame(onXRFrame);
+
+ // Bind the graphics framebuffer to the baseLayer's framebuffer
+ gl.bindFramebuffer(gl.FRAMEBUFFER, session.renderState.baseLayer.framebuffer)
+
+ // Retrieve the pose of the device.
+ // XRFrame.getViewerPose can return null while the session attempts to establish tracking.
+ const pose = frame.getViewerPose(referenceSpace);
+ if (pose) {
+ // In mobile AR, we only have one view.
+ const view = pose.views[0];
+
+ const viewport = session.renderState.baseLayer.getViewport(view);
+ renderer.setSize(viewport.width, viewport.height)
+
+ // Use the view's transform matrix and projection matrix to configure the THREE.camera.
+ camera.matrix.fromArray(view.transform.matrix)
+ camera.projectionMatrix.fromArray(view.projectionMatrix);
+ camera.updateMatrixWorld(true);
+
+ // Render the scene with THREE.WebGLRenderer.
+ renderer.render(scene, camera)
+ }
+}
+session.requestAnimationFrame(onXRFrame);
+
+}
+</script>
+</body>
+</html>
+