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<!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>
<!-- Import maps polyfill -->
<!-- Remove this when import maps will be widely supported -->
<script async src="https://unpkg.com/es-module-shims@1.8.0/dist/es-module-shims.js"></script>
<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>