gitadmin
/
three.js
mirror of https://github.com/mrdoob/three.js.git


			
				
					
						
						
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							<!-- Licensed under a BSD license. See license.html for license -->
<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0, user-scalable=yes">
    <title>Three.js - WebXR - Look to Select</title>
    <style>
    html, body {
        height: 100%;
        margin: 0;
    }
    #c {
        width: 100%;
        height: 100%;
        display: block;
    }
    </style>
  </head>
  <body>
    <canvas id="c"></canvas>
  </body>
<script type="importmap">
{
  "imports": {
    "three": "../../build/three.module.js",
    "three/addons/": "../../examples/jsm/"
  }
}
</script>

<script type="module">
import * as THREE from 'three';
import { VRButton } from 'three/addons/webxr/VRButton.js';

function main() {

	const canvas = document.querySelector( '#c' );
	const renderer = new THREE.WebGLRenderer( { antialias: true, canvas } );
	renderer.xr.enabled = true;
	document.body.appendChild( VRButton.createButton( renderer ) );

	const fov = 75;
	const aspect = 2; // the canvas default
	const near = 0.1;
	const far = 50;
	const camera = new THREE.PerspectiveCamera( fov, aspect, near, far );
	camera.position.set( 0, 1.6, 0 );

	const scene = new THREE.Scene();
	{

		const loader = new THREE.CubeTextureLoader();
		const texture = loader.load( [
			'resources/images/grid-1024.png',
			'resources/images/grid-1024.png',
			'resources/images/grid-1024.png',
			'resources/images/grid-1024.png',
			'resources/images/grid-1024.png',
			'resources/images/grid-1024.png',
		] );
		scene.background = texture;

	}

	{

		const color = 0xFFFFFF;
		const intensity = 3;
		const light = new THREE.DirectionalLight( color, intensity );
		light.position.set( - 1, 2, 4 );
		scene.add( light );

	}

	const boxWidth = 1;
	const boxHeight = 1;
	const boxDepth = 1;
	const geometry = new THREE.BoxGeometry( boxWidth, boxHeight, boxDepth );

	function makeInstance( geometry, color, x ) {

		const material = new THREE.MeshPhongMaterial( { color } );

		const cube = new THREE.Mesh( geometry, material );
		scene.add( cube );

		cube.position.x = x;
		cube.position.y = 1.6;
		cube.position.z = - 2;

		return cube;

	}

	const cubes = [
		makeInstance( geometry, 0x44aa88, 0 ),
		makeInstance( geometry, 0x8844aa, - 2 ),
		makeInstance( geometry, 0xaa8844, 2 ),
	];

	class PickHelper {

		constructor() {

			this.raycaster = new THREE.Raycaster();
			this.pickedObject = null;
			this.pickedObjectSavedColor = 0;

		}
		pick( normalizedPosition, scene, camera, time ) {

			// restore the color if there is a picked object
			if ( this.pickedObject ) {

				this.pickedObject.material.emissive.setHex( this.pickedObjectSavedColor );
				this.pickedObject = undefined;

			}

			// cast a ray through the frustum
			this.raycaster.setFromCamera( normalizedPosition, camera );
			// get the list of objects the ray intersected
			const intersectedObjects = this.raycaster.intersectObjects( scene.children );
			if ( intersectedObjects.length ) {

				// pick the first object. It's the closest one
				this.pickedObject = intersectedObjects[ 0 ].object;
				// save its color
				this.pickedObjectSavedColor = this.pickedObject.material.emissive.getHex();
				// set its emissive color to flashing red/yellow
				this.pickedObject.material.emissive.setHex( ( time * 8 ) % 2 > 1 ? 0xFFFF00 : 0xFF0000 );

			}

		}

	}

	const pickHelper = new PickHelper();

	function resizeRendererToDisplaySize( renderer ) {

		const canvas = renderer.domElement;
		const width = canvas.clientWidth;
		const height = canvas.clientHeight;
		const needResize = canvas.width !== width || canvas.height !== height;
		if ( needResize ) {

			renderer.setSize( width, height, false );

		}

		return needResize;

	}

	function render( time ) {

		time *= 0.001;

		if ( resizeRendererToDisplaySize( renderer ) ) {

			const canvas = renderer.domElement;
			camera.aspect = canvas.clientWidth / canvas.clientHeight;
			camera.updateProjectionMatrix();

		}

		cubes.forEach( ( cube, ndx ) => {

			const speed = 1 + ndx * .1;
			const rot = time * speed;
			cube.rotation.x = rot;
			cube.rotation.y = rot;

		} );

		// 0, 0 is the center of the view in normalized coordinates.
		pickHelper.pick( { x: 0, y: 0 }, scene, camera, time );

		renderer.render( scene, camera );

	}

	renderer.setAnimationLoop( render );

}

main();
</script>
</html>