-
Esguerra Montana authoredc9c1e929
<!-- Working for part 2: Can place a chair --><!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;
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
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);
})
let chair;
loader.load("./sunflower/sunflower.gltf", function(gltf) {
chair = gltf.scene;
chair.scale.set(0.5, 0.5, 0.5); // Adjust the scale as needed
});
session.addEventListener("select", (event) => {
if (chair) {
const clone = chair.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>