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Rafiei authoredf20902da
<!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>Hit to Place Demo</title> <!-- three.js --> <script src="https://unpkg.com/three@0.126.0/build/three.js"></script> <script src="https://unpkg.com/three@0.126.0/examples/js/loaders/GLTFLoader.js"></script></head><body><!-- Starting an immersive WebXR session requires user interaction. We start this one with a simple button. --><button onclick="activateXR()">Start Hit to Place 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(); const directionalLight = new THREE.DirectionalLight(0xffffff, 1.0); directionalLight.position.set(10, 15, 10); scene.add(directionalLight);// 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", {requiredFeatures: ['hit-test']});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 another XRReferenceSpace that has the viewer as the origin.const viewerSpace = await session.requestReferenceSpace('viewer');// Perform hit testing using the viewer as origin.const hitTestSource = await session.requestHitTestSource({ space: viewerSpace });const loader = new THREE.GLTFLoader();let reticle;loader.load("https://immersive-web.github.io/webxr-samples/media/gltf/reticle/reticle.gltf", function(gltf) { reticle = gltf.scene; reticle.visible = false; scene.add(reticle);
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})
let flower;
loader.load("https://immersive-web.github.io/webxr-samples/media/gltf/sunflower/sunflower.gltf", function(gltf) {
flower = gltf.scene;
});
session.addEventListener("select", (event) => {
if (flower) {
const clone = flower.clone();
clone.position.copy(reticle.position);
scene.add(clone);
}
});
// 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);
const hitTestResults = frame.getHitTestResults(hitTestSource);
if (hitTestResults.length > 0 && reticle) {
const hitPose = hitTestResults[0].getPose(referenceSpace);
reticle.visible = true;
reticle.position.set(hitPose.transform.position.x, hitPose.transform.position.y, hitPose.transform.position.z)
reticle.updateMatrixWorld(true);
}
// Render the scene with THREE.WebGLRenderer.
renderer.render(scene, camera)
}
}
session.requestAnimationFrame(onXRFrame);
}
</script>
</body>
</html>