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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 - Load .GLTF - Animated Cars</title>
- <style>
- html, body {
- margin: 0;
- height: 100%;
- }
- #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 { OrbitControls } from 'three/addons/controls/OrbitControls.js';
- import { GLTFLoader } from 'three/addons/loaders/GLTFLoader.js';
- function main() {
- const canvas = document.querySelector( '#c' );
- const renderer = new THREE.WebGLRenderer( { antialias: true, canvas } );
- const fov = 45;
- const aspect = 2; // the canvas default
- const near = 0.1;
- const far = 100;
- const camera = new THREE.PerspectiveCamera( fov, aspect, near, far );
- camera.position.set( 0, 10, 20 );
- const controls = new OrbitControls( camera, canvas );
- controls.target.set( 0, 5, 0 );
- controls.update();
- const scene = new THREE.Scene();
- scene.background = new THREE.Color( 'black' );
- {
- const planeSize = 40;
- const loader = new THREE.TextureLoader();
- const texture = loader.load( 'resources/images/checker.png' );
- texture.wrapS = THREE.RepeatWrapping;
- texture.wrapT = THREE.RepeatWrapping;
- texture.magFilter = THREE.NearestFilter;
- texture.colorSpace = THREE.SRGBColorSpace;
- const repeats = planeSize / 2;
- texture.repeat.set( repeats, repeats );
- const planeGeo = new THREE.PlaneGeometry( planeSize, planeSize );
- const planeMat = new THREE.MeshPhongMaterial( {
- map: texture,
- side: THREE.DoubleSide,
- } );
- const mesh = new THREE.Mesh( planeGeo, planeMat );
- mesh.rotation.x = Math.PI * - .5;
- scene.add( mesh );
- }
- {
- const skyColor = 0xB1E1FF; // light blue
- const groundColor = 0xB97A20; // brownish orange
- const intensity = 2;
- const light = new THREE.HemisphereLight( skyColor, groundColor, intensity );
- scene.add( light );
- }
- {
- const color = 0xFFFFFF;
- const intensity = 2.5;
- const light = new THREE.DirectionalLight( color, intensity );
- light.position.set( 5, 10, 2 );
- scene.add( light );
- scene.add( light.target );
- }
- function frameArea( sizeToFitOnScreen, boxSize, boxCenter, camera ) {
- const halfSizeToFitOnScreen = sizeToFitOnScreen * 0.5;
- const halfFovY = THREE.MathUtils.degToRad( camera.fov * .5 );
- const distance = halfSizeToFitOnScreen / Math.tan( halfFovY );
- // compute a unit vector that points in the direction the camera is now
- // in the xz plane from the center of the box
- const direction = ( new THREE.Vector3() )
- .subVectors( camera.position, boxCenter )
- .multiply( new THREE.Vector3( 1, 0, 1 ) )
- .normalize();
- // move the camera to a position distance units way from the center
- // in whatever direction the camera was from the center already
- camera.position.copy( direction.multiplyScalar( distance ).add( boxCenter ) );
- // pick some near and far values for the frustum that
- // will contain the box.
- camera.near = boxSize / 100;
- camera.far = boxSize * 100;
- camera.updateProjectionMatrix();
- // point the camera to look at the center of the box
- camera.lookAt( boxCenter.x, boxCenter.y, boxCenter.z );
- }
- let curve;
- let curveObject;
- {
- const controlPoints = [
- [ 1.118281, 5.115846, - 3.681386 ],
- [ 3.948875, 5.115846, - 3.641834 ],
- [ 3.960072, 5.115846, - 0.240352 ],
- [ 3.985447, 5.115846, 4.585005 ],
- [ - 3.793631, 5.115846, 4.585006 ],
- [ - 3.826839, 5.115846, - 14.736200 ],
- [ - 14.542292, 5.115846, - 14.765865 ],
- [ - 14.520929, 5.115846, - 3.627002 ],
- [ - 5.452815, 5.115846, - 3.634418 ],
- [ - 5.467251, 5.115846, 4.549161 ],
- [ - 13.266233, 5.115846, 4.567083 ],
- [ - 13.250067, 5.115846, - 13.499271 ],
- [ 4.081842, 5.115846, - 13.435463 ],
- [ 4.125436, 5.115846, - 5.334928 ],
- [ - 14.521364, 5.115846, - 5.239871 ],
- [ - 14.510466, 5.115846, 5.486727 ],
- [ 5.745666, 5.115846, 5.510492 ],
- [ 5.787942, 5.115846, - 14.728308 ],
- [ - 5.423720, 5.115846, - 14.761919 ],
- [ - 5.373599, 5.115846, - 3.704133 ],
- [ 1.004861, 5.115846, - 3.641834 ],
- ];
- const p0 = new THREE.Vector3();
- const p1 = new THREE.Vector3();
- curve = new THREE.CatmullRomCurve3(
- controlPoints.map( ( p, ndx ) => {
- p0.set( ...p );
- p1.set( ...controlPoints[ ( ndx + 1 ) % controlPoints.length ] );
- return [
- ( new THREE.Vector3() ).copy( p0 ),
- ( new THREE.Vector3() ).lerpVectors( p0, p1, 0.1 ),
- ( new THREE.Vector3() ).lerpVectors( p0, p1, 0.9 ),
- ];
- } ).flat(),
- true,
- );
- {
- const points = curve.getPoints( 250 );
- const geometry = new THREE.BufferGeometry().setFromPoints( points );
- const material = new THREE.LineBasicMaterial( { color: 0xff0000 } );
- curveObject = new THREE.Line( geometry, material );
- curveObject.scale.set( 100, 100, 100 );
- curveObject.position.y = - 621;
- curveObject.visible = false;
- material.depthTest = false;
- curveObject.renderOrder = 1;
- scene.add( curveObject );
- }
- }
- const cars = [];
- {
- const gltfLoader = new GLTFLoader();
- gltfLoader.load( 'resources/models/cartoon_lowpoly_small_city_free_pack/scene.gltf', ( gltf ) => {
- const root = gltf.scene;
- scene.add( root );
- const loadedCars = root.getObjectByName( 'Cars' );
- const fixes = [
- { prefix: 'Car_08', y: 0, rot: [ Math.PI * .5, 0, Math.PI * .5 ], },
- { prefix: 'CAR_03', y: 33, rot: [ 0, Math.PI, 0 ], },
- { prefix: 'Car_04', y: 40, rot: [ 0, Math.PI, 0 ], },
- ];
- root.updateMatrixWorld();
- for ( const car of loadedCars.children.slice() ) {
- const fix = fixes.find( fix => car.name.startsWith( fix.prefix ) );
- const obj = new THREE.Object3D();
- car.position.set( 0, fix.y, 0 );
- car.rotation.set( ...fix.rot );
- obj.add( car );
- scene.add( obj );
- cars.push( obj );
- }
- // compute the box that contains all the stuff
- // from root and below
- const box = new THREE.Box3().setFromObject( root );
- const boxSize = box.getSize( new THREE.Vector3() ).length();
- const boxCenter = box.getCenter( new THREE.Vector3() );
- // set the camera to frame the box
- frameArea( boxSize * 0.5, boxSize, boxCenter, camera );
- // update the Trackball controls to handle the new size
- controls.maxDistance = boxSize * 10;
- controls.target.copy( boxCenter );
- controls.update();
- } );
- }
- 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;
- }
- // create 2 Vector3s we can use for path calculations
- const carPosition = new THREE.Vector3();
- const carTarget = new THREE.Vector3();
- function render( time ) {
- time *= 0.001; // convert to seconds
- if ( resizeRendererToDisplaySize( renderer ) ) {
- const canvas = renderer.domElement;
- camera.aspect = canvas.clientWidth / canvas.clientHeight;
- camera.updateProjectionMatrix();
- }
- {
- const pathTime = time * .01;
- const targetOffset = 0.01;
- cars.forEach( ( car, ndx ) => {
- // a number between 0 and 1 to evenly space the cars
- const u = pathTime + ndx / cars.length;
- // get the first point
- curve.getPointAt( u % 1, carPosition );
- carPosition.applyMatrix4( curveObject.matrixWorld );
- // get a second point slightly further down the curve
- curve.getPointAt( ( u + targetOffset ) % 1, carTarget );
- carTarget.applyMatrix4( curveObject.matrixWorld );
- // put the car at the first point (temporarily)
- car.position.copy( carPosition );
- // point the car the second point
- car.lookAt( carTarget );
- // put the car between the 2 points
- car.position.lerpVectors( carPosition, carTarget, 0.5 );
- } );
- }
- renderer.render( scene, camera );
- requestAnimationFrame( render );
- }
- requestAnimationFrame( render );
- }
- main();
- </script>
- </html>
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