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Alfakhori authored13987450
/* * Copyright 2017 Google Inc. All Rights Reserved. * Licensed under the Apache License, Version 2.0 (the 'License'); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an 'AS IS' BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. *//** * Query for WebXR support. If there's no support for the `immersive-ar` mode, * show an error. */(async function() { const isArSessionSupported = navigator.xr && navigator.xr.isSessionSupported && await navigator.xr.isSessionSupported("immersive-ar"); if (isArSessionSupported) { document.getElementById("enter-ar").addEventListener("click", window.app.activateXR) } else { onNoXRDevice(); }})();/** * Container class to manage connecting to the WebXR Device API * and handle rendering on every frame. */class App { /** * Run when the Start AR button is pressed. */ activateXR = async () => { try { // Initialize a WebXR session using "immersive-ar". this.xrSession = await navigator.xr.requestSession("immersive-ar", { requiredFeatures: ['hit-test', 'dom-overlay'], domOverlay: { root: document.body } }); // Create the canvas that will contain our camera's background and our virtual scene. this.createXRCanvas(); // With everything set up, start the app. await this.onSessionStarted(); } catch(e) { console.log(e); onNoXRDevice(); } } /** * Add a canvas element and initialize a WebGL context that is compatible with WebXR. */ createXRCanvas() { this.canvas = document.createElement("canvas"); document.body.appendChild(this.canvas); this.gl = this.canvas.getContext("webgl", {xrCompatible: true}); this.xrSession.updateRenderState({ baseLayer: new XRWebGLLayer(this.xrSession, this.gl) }); } /** * Called when the XRSession has begun. Here we set up our three.js
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* renderer, scene, and camera and attach our XRWebGLLayer to the
* XRSession and kick off the render loop.
*/
onSessionStarted = async () => {
// Add the `ar` class to our body, which will hide our 2D components
document.body.classList.add('ar');
// To help with working with 3D on the web, we'll use three.js.
this.setupThreeJs();
// Setup an XRReferenceSpace using the "local" coordinate system.
this.localReferenceSpace = await this.xrSession.requestReferenceSpace('local');
// Create another XRReferenceSpace that has the viewer as the origin.
this.viewerSpace = await this.xrSession.requestReferenceSpace('viewer');
// Perform hit testing using the viewer as origin.
this.hitTestSource = await this.xrSession.requestHitTestSource({ space: this.viewerSpace });
// Start a rendering loop using this.onXRFrame.
this.xrSession.requestAnimationFrame(this.onXRFrame);
this.xrSession.addEventListener("select", this.onSelect);
}
/** Place a sunflower when the screen is tapped. */
onSelect = () => {
if (window.sunflower) {
const clone = window.sunflower.clone();
clone.position.copy(this.reticle.position);
this.scene.add(clone)
const shadowMesh = this.scene.children.find(c => c.name === 'shadowMesh');
shadowMesh.position.y = clone.position.y;
}
}
/**
* Called on the XRSession's requestAnimationFrame.
* Called with the time and XRPresentationFrame.
*/
onXRFrame = (time, frame) => {
// Queue up the next draw request.
this.xrSession.requestAnimationFrame(this.onXRFrame);
// Bind the graphics framebuffer to the baseLayer's framebuffer.
const framebuffer = this.xrSession.renderState.baseLayer.framebuffer
this.gl.bindFramebuffer(this.gl.FRAMEBUFFER, framebuffer)
this.renderer.setFramebuffer(framebuffer);
// Retrieve the pose of the device.
// XRFrame.getViewerPose can return null while the session attempts to establish tracking.
const pose = frame.getViewerPose(this.localReferenceSpace);
if (pose) {
// In mobile AR, we only have one view.
const view = pose.views[0];
const viewport = this.xrSession.renderState.baseLayer.getViewport(view);
this.renderer.setSize(viewport.width, viewport.height)
// Use the view's transform matrix and projection matrix to configure the THREE.camera.
this.camera.matrix.fromArray(view.transform.matrix)
this.camera.projectionMatrix.fromArray(view.projectionMatrix);
this.camera.updateMatrixWorld(true);
// Conduct hit test.
const hitTestResults = frame.getHitTestResults(this.hitTestSource);
// If we have results, consider the environment stabilized.
if (!this.stabilized && hitTestResults.length > 0) {
this.stabilized = true;
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document.body.classList.add('stabilized');
}
if (hitTestResults.length > 0) {
const hitPose = hitTestResults[0].getPose(this.localReferenceSpace);
// Update the reticle position
this.reticle.visible = true;
this.reticle.position.set(hitPose.transform.position.x, hitPose.transform.position.y, hitPose.transform.position.z)
this.reticle.updateMatrixWorld(true);
}
// Render the scene with THREE.WebGLRenderer.
this.renderer.render(this.scene, this.camera)
}
}
/**
* Initialize three.js specific rendering code, including a WebGLRenderer,
* a demo scene, and a camera for viewing the 3D content.
*/
setupThreeJs() {
// To help with working with 3D on the web, we'll use three.js.
// Set up the WebGLRenderer, which handles rendering to our session's base layer.
this.renderer = new THREE.WebGLRenderer({
alpha: true,
preserveDrawingBuffer: true,
canvas: this.canvas,
context: this.gl
});
this.renderer.autoClear = false;
this.renderer.shadowMap.enabled = true;
this.renderer.shadowMap.type = THREE.PCFSoftShadowMap;
// Initialize our demo scene.
this.scene = DemoUtils.createLitScene();
this.reticle = new Reticle();
this.scene.add(this.reticle);
// We'll update the camera matrices directly from API, so
// disable matrix auto updates so three.js doesn't attempt
// to handle the matrices independently.
this.camera = new THREE.PerspectiveCamera();
this.camera.matrixAutoUpdate = false;
}
};
window.app = new App();