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GitLab authored2e0dd521
<!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>Tetrahedron 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 Tetrahedron</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(); // Add lighting to the scene const light = new THREE.DirectionalLight(0xffffff, 1); light.position.set(1, 1, 1).normalize(); scene.add(light); const ambientLight = new THREE.AmbientLight(0x404040); // soft white light scene.add(ambientLight); // Color of the tetrahedron geometry. const material = new THREE.MeshPhysicalMaterial({ color: 0xC70039, roughness: 0.5, metalness: 0.5, clearcoat: 1.0, clearcoatRoughness: 0.1 }); // Create the tetrahedron and add it to the demo scene. const tetrahedron = new THREE.Mesh(new THREE.TetrahedronGeometry(0.5), material); // Position the tetrahedron tetrahedron.position.set(0, 0, -1); // Add the mesh to the scene scene.add(tetrahedron); // 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');
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// 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>