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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 .OBJ - Auto Framing Camera XZ Plane</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 { OBJLoader } from 'three/addons/loaders/OBJLoader.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 = 4000;
- const loader = new THREE.TextureLoader();
- const texture = loader.load( 'resources/images/checker.png' );
- texture.colorSpace = THREE.SRGBColorSpace;
- texture.wrapS = THREE.RepeatWrapping;
- texture.wrapT = THREE.RepeatWrapping;
- texture.magFilter = THREE.NearestFilter;
- const repeats = planeSize / 200;
- 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 );
- }
- {
- const objLoader = new OBJLoader();
- objLoader.load( 'resources/models/windmill_2/windmill.obj', ( root ) => {
- root.updateMatrixWorld();
- scene.add( root );
- // 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 * 1.2, 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;
- }
- function render() {
- if ( resizeRendererToDisplaySize( renderer ) ) {
- const canvas = renderer.domElement;
- camera.aspect = canvas.clientWidth / canvas.clientHeight;
- camera.updateProjectionMatrix();
- }
- renderer.render( scene, camera );
- requestAnimationFrame( render );
- }
- requestAnimationFrame( render );
- }
- main();
- </script>
- </html>
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