stemkoski.github.com/Three.js/Chase-Camera.html at 45f6743102bd946ce7a466009eae5158cdc04ace · stemkoski/stemkoski.github.com · GitHub

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<!doctype html>
<html lang="en">
<head>
	<title>Chase Camera (Three.js)</title>
	<meta charset="utf-8">
	<meta name="viewport" content="width=device-width, user-scalable=no, minimum-scale=1.0, maximum-scale=1.0">
	<link rel=stylesheet href="css/base.css"/>
</head>
<body>

<script src="js/Three.js"></script>
<script src="js/Detector.js"></script>
<script src="js/Stats.js"></script>
<script src="js/OrbitControls.js"></script>
<script src="js/THREEx.KeyboardState.js"></script>
<script src="js/THREEx.FullScreen.js"></script>
<script src="js/THREEx.WindowResize.js"></script>
<script src="js/tween.min.js"></script>

<!-- jQuery code to display an information button and box when clicked. -->
<script src="js/jquery-1.9.1.js"></script>
<script src="js/jquery-ui.js"></script>
<link rel=stylesheet href="css/jquery-ui.css" />
<link rel=stylesheet href="css/info.css"/>
<script src="js/info.js"></script>
<div id="infoButton"></div>
<div id="infoBox" title="Demo Information">
Movement controls: <br/>
<ul>
<li>W/S: Translate Forward/Backward
<li>A/D: Rotate Left/Right
<li>Q/E: Translate Left/Right
<li>R/F: Rotate Up/Down
<li>Z: Reset position and rotation.
</ul>
This three.js demo is part of a collection at
<a href="http://stemkoski.github.io/Three.js/">http://stemkoski.github.io/Three.js/</a>
</div>
<!-- ------------------------------------------------------------ -->

<div id="ThreeJS" style="position: absolute; left:0px; top:0px"></div>
<script>
/*
	Three.js "tutorials by example"
	Author: Lee Stemkoski
	Date: July 2013 (three.js v59dev)
*/

// MAIN

// standard global variables
var container, scene, camera, renderer, controls, stats;
var keyboard = new THREEx.KeyboardState();
var clock = new THREE.Clock();
// custom global variables
var cube;

init();
animate();

// FUNCTIONS
function init()
{
	// SCENE
	scene = new THREE.Scene();
	// CAMERA
	var SCREEN_WIDTH = window.innerWidth, SCREEN_HEIGHT = window.innerHeight;
	var VIEW_ANGLE = 45, ASPECT = SCREEN_WIDTH / SCREEN_HEIGHT, NEAR = 0.1, FAR = 20000;
	camera = new THREE.PerspectiveCamera( VIEW_ANGLE, ASPECT, NEAR, FAR);
	scene.add(camera);
	camera.position.set(0,150,400);
	camera.lookAt(scene.position);
	// RENDERER
	if ( Detector.webgl )
		renderer = new THREE.WebGLRenderer( {antialias:true} );
	else
		renderer = new THREE.CanvasRenderer();
	renderer.setSize(SCREEN_WIDTH, SCREEN_HEIGHT);
	container = document.getElementById( 'ThreeJS' );
	container.appendChild( renderer.domElement );
	// EVENTS
	THREEx.WindowResize(renderer, camera);
	THREEx.FullScreen.bindKey({ charCode : 'm'.charCodeAt(0) });

	// CONTROLS
	// MUST REMOVE THIS LINE!!!
	// controls = ...

	// STATS
	stats = new Stats();
	stats.domElement.style.position = 'absolute';
	stats.domElement.style.bottom = '0px';
	stats.domElement.style.zIndex = 100;
	container.appendChild( stats.domElement );
	// LIGHT
	var light = new THREE.PointLight(0xffffff);
	light.position.set(0,250,0);
	scene.add(light);
	// FLOOR
	var floorTexture = new THREE.ImageUtils.loadTexture( 'images/checkerboard.jpg' );
	floorTexture.wrapS = floorTexture.wrapT = THREE.RepeatWrapping;
	floorTexture.repeat.set( 10, 10 );
	var floorMaterial = new THREE.MeshBasicMaterial( { map: floorTexture, side: THREE.DoubleSide } );
	var floorGeometry = new THREE.PlaneGeometry(1000, 1000, 10, 10);
	var floor = new THREE.Mesh(floorGeometry, floorMaterial);
	floor.position.y = -0.5;
	floor.rotation.x = Math.PI / 2;
	scene.add(floor);
	// SKYBOX/FOG
	var skyBoxGeometry = new THREE.CubeGeometry( 10000, 10000, 10000 );
	var skyBoxMaterial = new THREE.MeshBasicMaterial( { color: 0x9999ff, side: THREE.BackSide } );
	var skyBox = new THREE.Mesh( skyBoxGeometry, skyBoxMaterial );
	// scene.add(skyBox);
	scene.fog = new THREE.FogExp2( 0x9999ff, 0.00025 );

	////////////
	// CUSTOM //
	////////////

	// create an array with six textures for a cool cube
	var materialArray = [];
	materialArray.push(new THREE.MeshBasicMaterial( { map: THREE.ImageUtils.loadTexture( 'images/xpos.png' ) }));
	materialArray.push(new THREE.MeshBasicMaterial( { map: THREE.ImageUtils.loadTexture( 'images/xneg.png' ) }));
	materialArray.push(new THREE.MeshBasicMaterial( { map: THREE.ImageUtils.loadTexture( 'images/ypos.png' ) }));
	materialArray.push(new THREE.MeshBasicMaterial( { map: THREE.ImageUtils.loadTexture( 'images/yneg.png' ) }));
	materialArray.push(new THREE.MeshBasicMaterial( { map: THREE.ImageUtils.loadTexture( 'images/zpos.png' ) }));
	materialArray.push(new THREE.MeshBasicMaterial( { map: THREE.ImageUtils.loadTexture( 'images/zneg.png' ) }));
	var MovingCubeMat = new THREE.MeshFaceMaterial(materialArray);
	var MovingCubeGeom = new THREE.CubeGeometry( 50, 50, 50, 1, 1, 1, materialArray );
	MovingCube = new THREE.Mesh( MovingCubeGeom, MovingCubeMat );
	MovingCube.position.set(0, 25.1, 0);
	scene.add( MovingCube );

}

var MovingCube;

function animate()
{
    requestAnimationFrame( animate );
	render();
	update();
}

function update()
{
	var delta = clock.getDelta(); // seconds.
	var moveDistance = 200 * delta; // 200 pixels per second
	var rotateAngle = Math.PI / 2 * delta;   // pi/2 radians (90 degrees) per second

	// local transformations

	// move forwards/backwards/left/right
	if ( keyboard.pressed("W") )
		MovingCube.translateZ( -moveDistance );
	if ( keyboard.pressed("S") )
		MovingCube.translateZ(  moveDistance );
	if ( keyboard.pressed("Q") )
		MovingCube.translateX( -moveDistance );
	if ( keyboard.pressed("E") )
		MovingCube.translateX(  moveDistance );

	// rotate left/right/up/down
	var rotation_matrix = new THREE.Matrix4().identity();
	if ( keyboard.pressed("A") )
		MovingCube.rotateOnAxis( new THREE.Vector3(0,1,0), rotateAngle);
	if ( keyboard.pressed("D") )
		MovingCube.rotateOnAxis( new THREE.Vector3(0,1,0), -rotateAngle);
	if ( keyboard.pressed("R") )
		MovingCube.rotateOnAxis( new THREE.Vector3(1,0,0), rotateAngle);
	if ( keyboard.pressed("F") )
		MovingCube.rotateOnAxis( new THREE.Vector3(1,0,0), -rotateAngle);

	if ( keyboard.pressed("Z") )
	{
		MovingCube.position.set(0,25.1,0);
		MovingCube.rotation.set(0,0,0);
	}

	var relativeCameraOffset = new THREE.Vector3(0,50,200);

	var cameraOffset = relativeCameraOffset.applyMatrix4( MovingCube.matrixWorld );

  TWEEN.update();

  // Apply smoothing to the camera transition.
  new TWEEN.Tween( camera.position ).to(
  {
    x: cameraOffset.x,
    y: cameraOffset.y,
    z: cameraOffset.z
  }, 90 )
  .interpolation( TWEEN.Interpolation.Bezier )
  .easing( TWEEN.Easing.Sinusoidal.InOut ).start();

  camera.lookAt( MovingCube.position );

	stats.update();
}

function render()
{
	renderer.render( scene, camera );
}

</script>

</body>
</html>