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-<!DOCTYPE html>
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-<html lang="en">
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- <head>
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- <title>three.js - platformer demo</title>
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- <meta charset="utf-8">
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- <meta name="viewport" content="width=device-width, user-scalable=no, minimum-scale=1.0, maximum-scale=1.0">
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- <link type="text/css" rel="stylesheet" href="main.css">
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- </head>
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- <body>
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-
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- <div id="info"><a href="http://threejs.org" target="_blank" rel="noopener">three.js</a> - platformer demo. cubemap by <a href="http://www.zfight.com/" target="_blank" rel="noopener">Jochum Skoglund</a>.<br />Use arrow keys to look around, WASD to move and SPACE to jump.</div>
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-
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- <script type="module">
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-
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- import * as THREE from '../build/three.module.js';
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-
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- // player motion parameters
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-
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- var motion = {
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- airborne: false,
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- position: new THREE.Vector3(), velocity: new THREE.Vector3(),
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- rotation: new THREE.Vector2(), spinning: new THREE.Vector2()
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- };
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-
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- motion.position.y = - 150;
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-
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-
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- // game systems code
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-
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- var resetPlayer = function () {
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-
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- if ( motion.position.y < - 123 ) {
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-
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- motion.position.set( - 2, 7.7, 25 );
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- motion.velocity.multiplyScalar( 0 );
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-
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- }
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-
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- };
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-
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- var keyboardControls = ( function () {
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-
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- var keys = { SP: 32, W: 87, A: 65, S: 83, D: 68, UP: 38, LT: 37, DN: 40, RT: 39 };
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-
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- var keysPressed = {};
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-
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- ( function ( watchedKeyCodes ) {
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-
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- var handler = function ( down ) {
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-
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- return function ( e ) {
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-
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- var index = watchedKeyCodes.indexOf( e.keyCode );
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- if ( index >= 0 ) {
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-
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- keysPressed[ watchedKeyCodes[ index ] ] = down;
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- e.preventDefault();
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-
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- }
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-
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- };
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-
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- };
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- window.addEventListener( "keydown", handler( true ), false );
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- window.addEventListener( "keyup", handler( false ), false );
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-
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- } )( [
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- keys.SP, keys.W, keys.A, keys.S, keys.D, keys.UP, keys.LT, keys.DN, keys.RT
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- ] );
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-
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- var forward = new THREE.Vector3();
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- var sideways = new THREE.Vector3();
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-
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- return function () {
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-
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- if ( ! motion.airborne ) {
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-
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- // look around
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- var sx = keysPressed[ keys.UP ] ? 0.03 : ( keysPressed[ keys.DN ] ? - 0.03 : 0 );
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- var sy = keysPressed[ keys.LT ] ? 0.03 : ( keysPressed[ keys.RT ] ? - 0.03 : 0 );
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-
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- if ( Math.abs( sx ) >= Math.abs( motion.spinning.x ) ) motion.spinning.x = sx;
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- if ( Math.abs( sy ) >= Math.abs( motion.spinning.y ) ) motion.spinning.y = sy;
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-
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- // move around
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- forward.set( Math.sin( motion.rotation.y ), 0, Math.cos( motion.rotation.y ) );
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- sideways.set( forward.z, 0, - forward.x );
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-
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- forward.multiplyScalar( keysPressed[ keys.W ] ? - 0.1 : ( keysPressed[ keys.S ] ? 0.1 : 0 ) );
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- sideways.multiplyScalar( keysPressed[ keys.A ] ? - 0.1 : ( keysPressed[ keys.D ] ? 0.1 : 0 ) );
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-
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- var combined = forward.add( sideways );
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- if ( Math.abs( combined.x ) >= Math.abs( motion.velocity.x ) ) motion.velocity.x = combined.x;
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- if ( Math.abs( combined.y ) >= Math.abs( motion.velocity.y ) ) motion.velocity.y = combined.y;
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- if ( Math.abs( combined.z ) >= Math.abs( motion.velocity.z ) ) motion.velocity.z = combined.z;
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-
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- //jump
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- var vy = keysPressed[ keys.SP ] ? 0.7 : 0;
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- motion.velocity.y += vy;
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-
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- }
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-
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- };
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-
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- } )();
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-
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- var jumpPads = ( function () {
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-
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- var pads = [ new THREE.Vector3( - 17.5, 8, - 10 ), new THREE.Vector3( 17.5, 8, - 10 ), new THREE.Vector3( 0, 8, 21 ) ];
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- var temp = new THREE.Vector3();
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-
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- return function () {
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-
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- if ( ! motion.airborne ) {
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-
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- for ( var j = 0, n = pads.length; j < n; j ++ ) {
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-
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- if ( pads[ j ].distanceToSquared( motion.position ) < 2.3 ) {
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-
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- // calculate velocity towards another side of platform from jump pad position
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- temp.copy( pads[ j ] );
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- temp.y = 0;
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- temp.setLength( - 0.8 );
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- temp.y = 0.7;
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-
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- motion.airborne = true;
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- motion.velocity.copy( temp );
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- break;
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-
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- }
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-
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- }
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-
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- }
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-
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- };
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-
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- } )();
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-
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- var applyPhysics = ( function () {
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-
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- var timeStep = 5;
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- var timeLeft = timeStep + 1;
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-
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- var birdsEye = 100;
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- var kneeDeep = 0.4;
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-
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- var raycaster = new THREE.Raycaster();
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- raycaster.ray.direction.set( 0, - 1, 0 );
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-
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- var angles = new THREE.Vector2();
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- var displacement = new THREE.Vector3();
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-
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- return function ( dt ) {
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-
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- var platform = scene.getObjectByName( "platform", true );
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- if ( platform ) {
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-
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- timeLeft += dt;
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-
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- // run several fixed-step iterations to approximate varying-step
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-
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- dt = 5;
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- while ( timeLeft >= dt ) {
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-
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- var time = 0.3, damping = 0.93, gravity = 0.01, tau = 2 * Math.PI;
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-
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- raycaster.ray.origin.copy( motion.position );
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- raycaster.ray.origin.y += birdsEye;
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-
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- var hits = raycaster.intersectObject( platform );
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-
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- motion.airborne = true;
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-
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- // are we above, or at most knee deep in, the platform?
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-
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- if ( ( hits.length > 0 ) && ( hits[ 0 ].face.normal.y > 0 ) ) {
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-
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- var actualHeight = hits[ 0 ].distance - birdsEye;
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-
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- // collision: stick to the surface if landing on it
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-
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- if ( ( motion.velocity.y <= 0 ) && ( Math.abs( actualHeight ) < kneeDeep ) ) {
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-
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- motion.position.y -= actualHeight;
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- motion.velocity.y = 0;
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- motion.airborne = false;
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-
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- }
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-
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- }
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-
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- if ( motion.airborne ) motion.velocity.y -= gravity;
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-
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- angles.copy( motion.spinning ).multiplyScalar( time );
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- if ( ! motion.airborne ) motion.spinning.multiplyScalar( damping );
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-
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- displacement.copy( motion.velocity ).multiplyScalar( time );
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- if ( ! motion.airborne ) motion.velocity.multiplyScalar( damping );
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-
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- motion.rotation.add( angles );
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- motion.position.add( displacement );
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-
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- // limit the tilt at ±0.4 radians
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-
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- motion.rotation.x = Math.max( - 0.4, Math.min( + 0.4, motion.rotation.x ) );
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-
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- // wrap horizontal rotation to 0...2π
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-
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- motion.rotation.y += tau;
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- motion.rotation.y %= tau;
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-
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- timeLeft -= dt;
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-
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- }
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-
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- }
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-
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- };
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-
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- } )();
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-
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- var updateCamera = ( function () {
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-
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- var euler = new THREE.Euler( 0, 0, 0, 'YXZ' );
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-
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- return function () {
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-
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- euler.x = motion.rotation.x;
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- euler.y = motion.rotation.y;
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- camera.quaternion.setFromEuler( euler );
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-
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- camera.position.copy( motion.position );
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-
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- camera.position.y += 3.0;
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-
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- };
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-
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- } )();
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-
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-
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- // init 3D stuff
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-
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- function makePlatform( url ) {
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-
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- var placeholder = new THREE.Object3D();
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-
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- var loader = new THREE.ObjectLoader();
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- loader.load( url, function ( platform ) {
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-
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- placeholder.add( platform );
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-
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- } );
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-
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- return placeholder;
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-
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- }
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-
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- var renderer = new THREE.WebGLRenderer( { antialias: true } );
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- renderer.setPixelRatio( window.devicePixelRatio );
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- document.body.appendChild( renderer.domElement );
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-
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- var camera = new THREE.PerspectiveCamera( 60, 1, 0.1, 9000 );
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-
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- var scene = new THREE.Scene();
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-
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- var envMap = new THREE.CubeTextureLoader().load( [
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- 'textures/cube/skybox/px.jpg', // right
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- 'textures/cube/skybox/nx.jpg', // left
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- 'textures/cube/skybox/py.jpg', // top
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- 'textures/cube/skybox/ny.jpg', // bottom
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- 'textures/cube/skybox/pz.jpg', // back
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- 'textures/cube/skybox/nz.jpg' // front
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- ] );
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- envMap.format = THREE.RGBFormat;
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-
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- scene.background = envMap;
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-
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- scene.add( makePlatform(
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- 'models/json/platform/platform.json'
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- ) );
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-
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- // start the game
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-
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- var start = function ( gameLoop, gameViewportSize ) {
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-
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- var resize = function () {
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-
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- var viewport = gameViewportSize();
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- renderer.setSize( viewport.width, viewport.height );
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- camera.aspect = viewport.width / viewport.height;
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- camera.updateProjectionMatrix();
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-
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- };
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-
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- window.addEventListener( 'resize', resize, false );
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- resize();
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-
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- var lastTimeStamp;
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- var render = function ( timeStamp ) {
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-
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- var timeElapsed = lastTimeStamp ? timeStamp - lastTimeStamp : 0;
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- lastTimeStamp = timeStamp;
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-
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- // call our game loop with the time elapsed since last rendering, in ms
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- gameLoop( timeElapsed );
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-
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- renderer.render( scene, camera );
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- requestAnimationFrame( render );
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-
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- };
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-
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- requestAnimationFrame( render );
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-
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- };
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-
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-
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- var gameLoop = function ( dt ) {
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-
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- resetPlayer();
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- keyboardControls();
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- jumpPads();
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- applyPhysics( dt );
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- updateCamera();
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-
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- };
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-
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- var gameViewportSize = function () {
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-
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- return {
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-
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- width: window.innerWidth, height: window.innerHeight
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-
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- };
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-
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- };
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-
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- start( gameLoop, gameViewportSize );
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- </script>
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- </body>
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-</html>
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Michael Herzog
