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<html>
<head>
<title>Hit test example</title>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, user-scalable=no, minimum-scale=1.0, maximum-scale=1.0">
<style>
body, html {
padding: 0;
margin: 0;
overflow: hidden;
position: fixed;
width: 100%;
height: 100vh;
-webkit-user-select: none;
user-select: none;
}
#target {
width: 100%;
height: 100%;
position: absolute;
}
.common-message {
position: absolute;
top: 50%;
left: 50%;
transform: translate(-50%, -50%);
font-size: 20px;
}
</style>
<link rel="stylesheet" href="../common.css"/>
<script src="../libs/three.min.js"></script>
<script type="module" src="../../polyfill/XRPolyfill.js"></script>
<script nomodule src="../../dist/webxr-polyfill.js"></script>
<script src="../common.js"></script>
</head>
<body>
<div id="target" />
<div onclick="hideMe(this)" id="description">
<h2>Hit Test</h2>
<h5>(click to dismiss)</h5>
<p>Find anchors by searching on tap events.</p>
</div>
<script>
/*
HitTestExample shows how to find surfaces or other features and place content relative to them.
In a production application, you would not create a separate anchor for every user action because
your application would quickly slow down tracking so many anchors. Instead, find an anchor
for groups of content that are positioned relative to some surface or other feature.
*/
class HitTestExample extends XRExampleBase {
constructor(domElement){
super(domElement, false)
// A message at the bottom of the screen that shows whether a surface has been found
this._messageEl = document.createElement('div')
this.el.appendChild(this._messageEl)
this._messageEl.style.position = 'absolute'
this._messageEl.style.bottom = '10px'
this._messageEl.style.left = '10px'
this._messageEl.style.color = 'white'
this._messageEl.style['font-size'] = '16px'
this.el.addEventListener('touchstart', this._onTouchStart.bind(this), false)
}
// Called during construction to allow the app to populate this.scene
initializeScene(){
// Add a box at the scene origin
let box = new THREE.Mesh(
new THREE.BoxBufferGeometry(0.1, 0.1, 0.1),
new THREE.MeshPhongMaterial({ color: '#DDFFDD' })
)
box.position.set(0, 0.05, 0)
var axesHelper = AxesHelper( 0.2 );
this.floorGroup.add( axesHelper );
this.floorGroup.add(box)
// Add a few lights
this.scene.add(new THREE.AmbientLight('#FFF', 0.2))
let directionalLight = new THREE.DirectionalLight('#FFF', 0.6)
directionalLight.position.set(0, 10, 0)
this.scene.add(directionalLight)
}
// Called once per frame, before render, to give the app a chance to update this.scene
updateScene(frame){
}
// Save screen taps as normalized coordinates for use in this.updateScene
_onTouchStart(ev){
if (!ev.touches || ev.touches.length === 0) {
console.error('No touches on touch event', ev)
return
}
const x = ev.touches[0].clientX / window.innerWidth
const y = ev.touches[0].clientY / window.innerHeight
// Attempt a hit test using the normalized screen coordinates
this.session.hitTest(x, y).then(anchorOffset => {
if(anchorOffset === null){
this._messageEl.innerHTML = 'miss'
} else {
this._messageEl.innerHTML = 'hit'
this.addAnchoredNode(anchorOffset, this._createSceneGraphNode())
}
}).catch(err => {
console.error('Error in hit test', err)
})
}
// Creates a box used to indicate the location of an anchor offset
_createSceneGraphNode(){
let group = new THREE.Group()
let geometry = new THREE.BoxBufferGeometry(0.1, 0.1, 0.1)
let material = new THREE.MeshPhongMaterial({ color: '#99FF99' })
let mesh = new THREE.Mesh(geometry, material)
mesh.position.set(0, 0.05, 0)
group.add(mesh)
return group
}
}
function AxesHelper( size ) {
size = size || 1;
var vertices = [
0, 0, 0, size, 0, 0,
0, 0, 0, 0, size, 0,
0, 0, 0, 0, 0, size
];
var colors = [
1, 0, 0, 1, 0.6, 0,
0, 1, 0, 0.6, 1, 0,
0, 0, 1, 0, 0.6, 1
];
var geometry = new THREE.BufferGeometry();
geometry.addAttribute( 'position', new THREE.Float32BufferAttribute( vertices, 3 ) );
geometry.addAttribute( 'color', new THREE.Float32BufferAttribute( colors, 3 ) );
var material = new THREE.LineBasicMaterial( { vertexColors: THREE.VertexColors } );
return new THREE.LineSegments(geometry, material);
}
window.addEventListener('DOMContentLoaded', () => {
setTimeout(() => {
try {
window.pageApp = new HitTestExample(document.getElementById('target'))
} catch(e) {
console.error('page error', e)
}
}, 1000)
})
</script>
</body>
</html>