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shaoweigege/center-of-the-universe.markdown

Created October 26, 2021 23:34
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Center of the universe
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center-of-the-universe.markdown
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index.html
<div id="container"></div>
<img src="https://s3-us-west-2.amazonaws.com/s.cdpn.io/1037366/planet2.png">
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script.js
var camera, scene, renderer;
var texture_placeholder,
isUserInteracting = false,
onMouseDownMouseX = 0, onMouseDownMouseY = 0,
lon = 90, onMouseDownLon = 0,
lat = 0, onMouseDownLat = 0,
phi = 0, theta = 0,
target = new THREE.Vector3();
init();
animate();
function init() {
var container, mesh;
container = document.getElementById( 'container' );
camera = new THREE.PerspectiveCamera( 75, window.innerWidth / window.innerHeight, 1, 1100 );
scene = new THREE.Scene();
texture_placeholder = document.createElement( 'canvas' );
texture_placeholder.width = 128;
texture_placeholder.height = 128;
var context = texture_placeholder.getContext( '2d' );
context.fillStyle = 'rgb( 200, 200, 200 )';
context.fillRect( 0, 0, texture_placeholder.width, texture_placeholder.height );
var materials = [
loadTexture( 'https://s3-us-west-2.amazonaws.com/s.cdpn.io/1037366/space4.jpg' ), // right
loadTexture( 'https://s3-us-west-2.amazonaws.com/s.cdpn.io/1037366/space2.jpg' ), // left
loadTexture( 'https://s3-us-west-2.amazonaws.com/s.cdpn.io/1037366/space1.jpg' ), // top
loadTexture( 'https://s3-us-west-2.amazonaws.com/s.cdpn.io/1037366/space6.jpg' ), // bottom
loadTexture( 'https://s3-us-west-2.amazonaws.com/s.cdpn.io/1037366/space3.jpg' ), // back
loadTexture( 'https://s3-us-west-2.amazonaws.com/s.cdpn.io/1037366/space5.jpg' ) // front
];
mesh = new THREE.Mesh( new THREE.BoxGeometry( 300, 300, 300, 7, 7, 7 ), new THREE.MultiMaterial( materials ) );
mesh.scale.x = - 1;
scene.add( mesh );
for ( var i = 0, l = mesh.geometry.vertices.length; i < l; i ++ ) {
var vertex = mesh.geometry.vertices[ i ];
vertex.normalize();
vertex.multiplyScalar( 550 );
}
renderer = new THREE.CanvasRenderer();
renderer.setPixelRatio( window.devicePixelRatio );
renderer.setSize( window.innerWidth, window.innerHeight );
container.appendChild( renderer.domElement );
document.addEventListener( 'mousedown', onDocumentMouseDown, false );
document.addEventListener( 'mousemove', onDocumentMouseMove, false );
document.addEventListener( 'mouseup', onDocumentMouseUp, false );
//document.addEventListener( 'wheel', onDocumentMouseWheel, false );
document.addEventListener( 'touchstart', onDocumentTouchStart, false );
document.addEventListener( 'touchmove', onDocumentTouchMove, false );
//
window.addEventListener( 'resize', onWindowResize, false );
}
function onWindowResize() {
camera.aspect = window.innerWidth / window.innerHeight;
camera.updateProjectionMatrix();
renderer.setSize( window.innerWidth, window.innerHeight );
}
function loadTexture( path ) {
var texture = new THREE.Texture( texture_placeholder );
var material = new THREE.MeshBasicMaterial( { map: texture, overdraw: 0.5 } );
var image = new Image();
image.onload = function () {
texture.image = this;
texture.needsUpdate = true;
};
image.src = path;
return material;
}
function onDocumentMouseDown( event ) {
event.preventDefault();
isUserInteracting = true;
onPointerDownPointerX = event.clientX;
onPointerDownPointerY = event.clientY;
onPointerDownLon = lon;
onPointerDownLat = lat;
}
function onDocumentMouseMove( event ) {
if ( isUserInteracting === true ) {
lon = ( onPointerDownPointerX - event.clientX ) * 0.1 + onPointerDownLon;
lat = ( event.clientY - onPointerDownPointerY ) * 0.1 + onPointerDownLat;
}
}
function onDocumentMouseUp( event ) {
isUserInteracting = false;
}
// function onDocumentMouseWheel( event ) {
// camera.fov += event.deltaY * 0.05;
// camera.updateProjectionMatrix();
// }
function onDocumentTouchStart( event ) {
if ( event.touches.length == 1 ) {
event.preventDefault();
onPointerDownPointerX = event.touches[ 0 ].pageX;
onPointerDownPointerY = event.touches[ 0 ].pageY;
onPointerDownLon = lon;
onPointerDownLat = lat;
}
}
function onDocumentTouchMove( event ) {
if ( event.touches.length == 1 ) {
event.preventDefault();
lon = ( onPointerDownPointerX - event.touches[0].pageX ) * 0.1 + onPointerDownLon;
lat = ( event.touches[0].pageY - onPointerDownPointerY ) * 0.1 + onPointerDownLat;
}
}
function animate() {
requestAnimationFrame( animate );
update();
}
function update() {
if ( isUserInteracting === false ) {
lon += 0.1;
}
lat = Math.max( - 85, Math.min( 85, lat ) );
phi = THREE.Math.degToRad( 90 - lat );
theta = THREE.Math.degToRad( lon );
target.x = 500 * Math.sin( phi ) * Math.cos( theta );
target.y = 500 * Math.cos( phi );
target.z = 500 * Math.sin( phi ) * Math.sin( theta );
camera.position.copy( target ).negate();
camera.lookAt( target );
renderer.render( scene, camera );
}
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scripts
<script src="https://s3-us-west-2.amazonaws.com/s.cdpn.io/1037366/three.js"></script>
<script src="https://s3-us-west-2.amazonaws.com/s.cdpn.io/1037366/CanvasRenderer.js"></script>
<script src="https://s3-us-west-2.amazonaws.com/s.cdpn.io/1037366/Projector.js"></script>
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style.css
html, body {margin:0; overflow:hidden;}
img {
width: 8vw;
position: absolute;
top: 0;
right: 0;
left: 0;
bottom: 0;
margin: auto;
}
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