<!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>
<button onclick="activateXR()">Start Hit to Place Demo</button>
<script>
async function activateXR() {
try {
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);
const renderer = new THREE.WebGLRenderer({
alpha: true,
preserveDrawingBuffer: true,
canvas: canvas,
context: gl
});
renderer.autoClear = false;
const camera = new THREE.PerspectiveCamera();
camera.matrixAutoUpdate = false;
const session = await navigator.xr.requestSession("immersive-ar", {requiredFeatures: ['hit-test']});
session.updateRenderState({
baseLayer: new XRWebGLLayer(session, gl)
});
const referenceSpace = await session.requestReferenceSpace('local');
const viewerSpace = await session.requestReferenceSpace('viewer');
const hitTestSource = await session.requestHitTestSource({ space: viewerSpace });
const loader = new THREE.GLTFLoader();
let reticle;
loader.load("https://transfer.hft-stuttgart.de/gitlab/32esla1mpg/webarTTP/-/tree/master/media/reticle.gltf", function(gltf) {
reticle = gltf.scene;
reticle.visible = false;
scene.add(reticle);
console.log("Reticle loaded successfully");
}, undefined, function(error) {
console.error("Error loading reticle:", error);
});
let model;
loader.load("https://transfer.hft-stuttgart.de/gitlab/32esla1mpg/webarTTP/-/tree/master/media/sunflower.gltf", function(gltf) {
model = gltf.scene;
console.log("Model loaded successfully");
}, undefined, function(error) {
console.error("Error loading model:", error);
});
session.addEventListener("select", (event) => {
if (model && reticle.visible) {
const clone = model.clone();
clone.position.copy(reticle.position);
scene.add(clone);
console.log("Model placed in scene");
}
});
const onXRFrame = (time, frame) => {
session.requestAnimationFrame(onXRFrame);
gl.bindFramebuffer(gl.FRAMEBUFFER, session.renderState.baseLayer.framebuffer);
const pose = frame.getViewerPose(referenceSpace);
if (pose) {
const view = pose.views[0];
const viewport = session.renderState.baseLayer.getViewport(view);
renderer.setSize(viewport.width, viewport.height);
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);
} else if (reticle) {
reticle.visible = false;
}
renderer.render(scene, camera);
}
};
session.requestAnimationFrame(onXRFrame);
} catch (error) {
console.error("Error in activateXR:", error);
}
}
</script>
</body>
</html>