WebGL Demo using ThreeJs. With inverse kinematics, physics and a lot of cat psychology :) This cat is a 3D remake of the main character of "Babel, the cat who would be king", a children app I did some time ago. Find it here : http://babeltheking.com/ Enjoy!
Created
December 25, 2017 05:35
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Cat vs ball of wool
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<div id="world"/> | |
<div id="credits"> | |
<p><a href="http://babeltheking.com" target="blank">Babel the king</a> | <a href="https://codepen.io/Yakudoo/" target="blank">my other codepens</a> | <a href="https://www.epic.net" target="blank">epic.net</a></p> | |
</div> |
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//THREEJS RELATED VARIABLES | |
var scene, | |
camera, fieldOfView, aspectRatio, nearPlane, farPlane, | |
gobalLight, shadowLight, backLight, | |
renderer, | |
container, | |
controls; | |
//SCREEN & MOUSE VARIABLES | |
var HEIGHT, WIDTH, windowHalfX, windowHalfY, | |
mousePos = { x: 0, y: 0 }, | |
oldMousePos = {x:0, y:0}, | |
ballWallDepth = 28; | |
//3D OBJECTS VARIABLES | |
var hero; | |
//INIT THREE JS, SCREEN AND MOUSE EVENTS | |
function initScreenAnd3D() { | |
HEIGHT = window.innerHeight; | |
WIDTH = window.innerWidth; | |
windowHalfX = WIDTH / 2; | |
windowHalfY = HEIGHT / 2; | |
scene = new THREE.Scene(); | |
aspectRatio = WIDTH / HEIGHT; | |
fieldOfView = 50; | |
nearPlane = 1; | |
farPlane = 2000; | |
camera = new THREE.PerspectiveCamera( | |
fieldOfView, | |
aspectRatio, | |
nearPlane, | |
farPlane | |
); | |
camera.position.x = 0; | |
camera.position.z = 300; | |
camera.position.y = 250; | |
camera.lookAt(new THREE.Vector3(0, 60, 0)); | |
renderer = new THREE.WebGLRenderer({ alpha: true, antialias: true }); | |
renderer.setPixelRatio( window.devicePixelRatio ); | |
renderer.setSize(WIDTH, HEIGHT); | |
renderer.shadowMapEnabled = true; | |
container = document.getElementById('world'); | |
container.appendChild(renderer.domElement); | |
window.addEventListener('resize', handleWindowResize, false); | |
document.addEventListener('mousemove', handleMouseMove, false); | |
document.addEventListener('touchmove', handleTouchMove, false); | |
/* | |
controls = new THREE.OrbitControls(camera, renderer.domElement); | |
controls.minPolarAngle = -Math.PI / 2; | |
controls.maxPolarAngle = Math.PI / 2; | |
controls.noZoom = true; | |
controls.noPan = true; | |
//*/ | |
} | |
function handleWindowResize() { | |
HEIGHT = window.innerHeight; | |
WIDTH = window.innerWidth; | |
windowHalfX = WIDTH / 2; | |
windowHalfY = HEIGHT / 2; | |
renderer.setSize(WIDTH, HEIGHT); | |
camera.aspect = WIDTH / HEIGHT; | |
camera.updateProjectionMatrix(); | |
} | |
function handleMouseMove(event) { | |
mousePos = {x:event.clientX, y:event.clientY}; | |
} | |
function handleTouchMove(event) { | |
if (event.touches.length == 1) { | |
event.preventDefault(); | |
mousePos = {x:event.touches[0].pageX, y:event.touches[0].pageY}; | |
} | |
} | |
function createLights() { | |
globalLight = new THREE.HemisphereLight(0xffffff, 0xffffff, .5) | |
shadowLight = new THREE.DirectionalLight(0xffffff, .9); | |
shadowLight.position.set(200, 200, 200); | |
shadowLight.castShadow = true; | |
shadowLight.shadowDarkness = .2; | |
shadowLight.shadowMapWidth = shadowLight.shadowMapHeight = 2048; | |
backLight = new THREE.DirectionalLight(0xffffff, .4); | |
backLight.position.set(-100, 100, 100); | |
backLight.castShadow = true; | |
backLight.shadowDarkness = .1; | |
backLight.shadowMapWidth = shadowLight.shadowMapHeight = 2048; | |
scene.add(globalLight); | |
scene.add(shadowLight); | |
scene.add(backLight); | |
} | |
function createFloor(){ | |
floor = new THREE.Mesh(new THREE.PlaneBufferGeometry(1000,1000), new THREE.MeshBasicMaterial({color: 0x6ecccc})); | |
floor.rotation.x = -Math.PI/2; | |
floor.position.y = 0; | |
floor.receiveShadow = true; | |
scene.add(floor); | |
} | |
function createHero() { | |
hero = new Cat(); | |
scene.add(hero.threeGroup); | |
} | |
function createBall() { | |
ball = new Ball(); | |
scene.add(ball.threeGroup); | |
} | |
// BALL RELATED CODE | |
var woolNodes = 10, | |
woolSegLength = 2, | |
gravity = -.8, | |
accuracy =1; | |
Ball = function(){ | |
var redMat = new THREE.MeshLambertMaterial ({ | |
color: 0x630d15, | |
shading:THREE.FlatShading | |
}); | |
var stringMat = new THREE.LineBasicMaterial({ | |
color: 0x630d15, | |
linewidth: 3 | |
}); | |
this.threeGroup = new THREE.Group(); | |
this.ballRay = 8; | |
this.verts = []; | |
// string | |
var stringGeom = new THREE.Geometry(); | |
for (var i=0; i< woolNodes; i++ ){ | |
var v = new THREE.Vector3(0, -i*woolSegLength, 0); | |
stringGeom.vertices.push(v); | |
var woolV = new WoolVert(); | |
woolV.x = woolV.oldx = v.x; | |
woolV.y = woolV.oldy = v.y; | |
woolV.z = 0; | |
woolV.fx = woolV.fy = 0; | |
woolV.isRootNode = (i==0); | |
woolV.vertex = v; | |
if (i > 0) woolV.attach(this.verts[(i - 1)]); | |
this.verts.push(woolV); | |
} | |
this.string = new THREE.Line(stringGeom, stringMat); | |
// body | |
var bodyGeom = new THREE.SphereGeometry(this.ballRay, 5,4); | |
this.body = new THREE.Mesh(bodyGeom, redMat); | |
this.body.position.y = -woolSegLength*woolNodes; | |
var wireGeom = new THREE.TorusGeometry( this.ballRay, .5, 3, 10, Math.PI*2 ); | |
this.wire1 = new THREE.Mesh(wireGeom, redMat); | |
this.wire1.position.x = 1; | |
this.wire1.rotation.x = -Math.PI/4; | |
this.wire2 = this.wire1.clone(); | |
this.wire2.position.y = 1; | |
this.wire2.position.x = -1; | |
this.wire1.rotation.x = -Math.PI/4 + .5; | |
this.wire1.rotation.y = -Math.PI/6; | |
this.wire3 = this.wire1.clone(); | |
this.wire3.rotation.x = -Math.PI/2 + .3; | |
this.wire4 = this.wire1.clone(); | |
this.wire4.position.x = -1; | |
this.wire4.rotation.x = -Math.PI/2 + .7; | |
this.wire5 = this.wire1.clone(); | |
this.wire5.position.x = 2; | |
this.wire5.rotation.x = -Math.PI/2 + 1; | |
this.wire6 = this.wire1.clone(); | |
this.wire6.position.x = 2; | |
this.wire6.position.z = 1; | |
this.wire6.rotation.x = 1; | |
this.wire7 = this.wire1.clone(); | |
this.wire7.position.x = 1.5; | |
this.wire7.rotation.x = 1.1; | |
this.wire8 = this.wire1.clone(); | |
this.wire8.position.x = 1; | |
this.wire8.rotation.x = 1.3; | |
this.wire9 = this.wire1.clone(); | |
this.wire9.scale.set(1.2,1.1,1.1); | |
this.wire9.rotation.z = Math.PI/2; | |
this.wire9.rotation.y = Math.PI/2; | |
this.wire9.position.y = 1; | |
this.body.add(this.wire1); | |
this.body.add(this.wire2); | |
this.body.add(this.wire3); | |
this.body.add(this.wire4); | |
this.body.add(this.wire5); | |
this.body.add(this.wire6); | |
this.body.add(this.wire7); | |
this.body.add(this.wire8); | |
this.body.add(this.wire9); | |
this.threeGroup.add(this.string); | |
this.threeGroup.add(this.body); | |
this.threeGroup.traverse( function ( object ) { | |
if ( object instanceof THREE.Mesh ) { | |
object.castShadow = true; | |
object.receiveShadow = true; | |
}}); | |
} | |
/* | |
The next part of the code is largely inspired by this codepen : | |
https://codepen.io/dissimulate/pen/KrAwx?editors=001 | |
thanks to dissimulate for his great work | |
*/ | |
/* | |
Copyright (c) 2013 dissimulate at Codepen | |
Permission is hereby granted, free of charge, to any person obtaining a copy | |
of this software and associated documentation files (the "Software"), to deal | |
in the Software without restriction, including without limitation the rights | |
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | |
copies of the Software, and to permit persons to whom the Software is | |
furnished to do so, subject to the following conditions: | |
The above copyright notice and this permission notice shall be included in | |
all copies or substantial portions of the Software. | |
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE | |
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | |
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | |
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN | |
THE SOFTWARE. | |
*/ | |
WoolVert = function(){ | |
this.x = 0; | |
this.y = 0; | |
this.z = 0; | |
this.oldx = 0; | |
this.oldy = 0; | |
this.fx = 0; | |
this.fy = 0; | |
this.isRootNode = false; | |
this.constraints = []; | |
this.vertex = null; | |
} | |
WoolVert.prototype.update = function(){ | |
var wind = 0;//.1+Math.random()*.5; | |
this.add_force(wind, gravity); | |
nx = this.x + ((this.x - this.oldx)*.9) + this.fx; | |
ny = this.y + ((this.y - this.oldy)*.9) + this.fy; | |
this.oldx = this.x; | |
this.oldy = this.y; | |
this.x = nx; | |
this.y = ny; | |
this.vertex.x = this.x; | |
this.vertex.y = this.y; | |
this.vertex.z = this.z; | |
this.fy = this.fx = 0 | |
} | |
WoolVert.prototype.attach = function(point) { | |
this.constraints.push(new Constraint(this, point)); | |
}; | |
WoolVert.prototype.add_force = function(x, y) { | |
this.fx += x; | |
this.fy += y; | |
}; | |
Constraint = function(p1, p2) { | |
this.p1 = p1; | |
this.p2 = p2; | |
this.length = woolSegLength; | |
}; | |
Ball.prototype.update = function(posX, posY, posZ){ | |
var i = accuracy; | |
while (i--) { | |
var nodesCount = woolNodes; | |
while (nodesCount--) { | |
var v = this.verts[nodesCount]; | |
if (v.isRootNode) { | |
v.x = posX; | |
v.y = posY; | |
v.z = posZ; | |
} | |
else { | |
var constraintsCount = v.constraints.length; | |
while (constraintsCount--) { | |
var c = v.constraints[constraintsCount]; | |
var diff_x = c.p1.x - c.p2.x, | |
diff_y = c.p1.y - c.p2.y, | |
dist = Math.sqrt(diff_x * diff_x + diff_y * diff_y), | |
diff = (c.length - dist) / dist; | |
var px = diff_x * diff * .5; | |
var py = diff_y * diff * .5; | |
c.p1.x += px; | |
c.p1.y += py; | |
c.p2.x -= px; | |
c.p2.y -= py; | |
c.p1.z = c.p2.z = posZ; | |
} | |
if (nodesCount == woolNodes-1){ | |
this.body.position.x = this.verts[nodesCount].x; | |
this.body.position.y = this.verts[nodesCount].y; | |
this.body.position.z = this.verts[nodesCount].z; | |
this.body.rotation.z += (v.y <= this.ballRay)? (v.oldx-v.x)/10 : Math.min(Math.max( diff_x/2, -.1 ), .1); | |
} | |
} | |
if (v.y < this.ballRay) { | |
v.y = this.ballRay; | |
} | |
} | |
} | |
nodesCount = woolNodes; | |
while (nodesCount--) this.verts[nodesCount].update(); | |
this.string.geometry.verticesNeedUpdate = true; | |
} | |
Ball.prototype.receivePower = function(tp){ | |
this.verts[woolNodes-1].add_force(tp.x, tp.y); | |
} | |
// Enf of the code inspired by dissmulate | |
// Make everything work together : | |
var t=0; | |
function loop(){ | |
render(); | |
t+=.05; | |
hero.updateTail(t); | |
var ballPos = getBallPos(); | |
ball.update(ballPos.x,ballPos.y, ballPos.z); | |
ball.receivePower(hero.transferPower); | |
hero.interactWithBall(ball.body.position); | |
requestAnimationFrame(loop); | |
} | |
function getBallPos(){ | |
var vector = new THREE.Vector3(); | |
vector.set( | |
( mousePos.x / window.innerWidth ) * 2 - 1, | |
- ( mousePos.y / window.innerHeight ) * 2 + 1, | |
0.1 ); | |
vector.unproject( camera ); | |
var dir = vector.sub( camera.position ).normalize(); | |
var distance = (ballWallDepth - camera.position.z) / dir.z; | |
var pos = camera.position.clone().add( dir.multiplyScalar( distance ) ); | |
return pos; | |
} | |
function render(){ | |
if (controls) controls.update(); | |
renderer.render(scene, camera); | |
} | |
window.addEventListener('load', init, false); | |
function init(event){ | |
initScreenAnd3D(); | |
createLights(); | |
createFloor() | |
createHero(); | |
createBall(); | |
loop(); | |
} |
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<script src="//cdnjs.cloudflare.com/ajax/libs/three.js/r70/three.min.js"></script> | |
<script src="//cdnjs.cloudflare.com/ajax/libs/gsap/1.16.1/TweenMax.min.js"></script> | |
<script src="https://s3-us-west-2.amazonaws.com/s.cdpn.io/264161/OrbitControls.js"></script> | |
<script src="https://s3-us-west-2.amazonaws.com/s.cdpn.io/264161/Cat.js"></script> |
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@import url(https://fonts.googleapis.com/css?family=Open+Sans:800); | |
#world{ | |
position: absolute; | |
width:100%; | |
height: 100%; | |
background-color: #6ecccc; | |
overflow:hidden; | |
} | |
#credits{ | |
position:absolute; | |
width:100%; | |
margin: auto; | |
bottom:0; | |
margin-bottom:20px; | |
font-family:'Open Sans', sans-serif; | |
color:#328685; | |
font-size:0.7em; | |
text-transform: uppercase; | |
text-align : center; | |
} | |
#credits a { | |
color:#328685; | |
} | |
#credits a:hover { | |
color:#630d15; | |
} |
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