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16-shadingWithAO2.html
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<!DOCTYPE html>
<html lang="en">
<head>
<title>three.js webgl - normal mapping</title>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, user-scalable=no, minimum-scale=1.0, maximum-scale=1.0">
<style>
body {
background-color: #f0f0f0;
margin: 0px;
overflow: hidden;
}
#info {
position: absolute;
top: 0px; width: 100%;
color: #222;
padding: 5px;
font-family: Monospace;
font-size: 13px;
text-align: center;
}
a {
color: #000;
text-decoration: none;
}
a:hover {
color: #0080ff;
}
</style>
</head>
<body>
<div id="info">
<a href="https://github.com/robertoranon/int3D" target="_blank">Interactive 3D Graphics 2017 code</a> - normal mapping<br />
</div>
<script src="lib/three.min.js"></script>
<script src="lib/stats.min.js"></script>
<script src="lib/OrbitControls.js"></script>
<script src='lib/dat.gui.min.js'></script>
<script src='lib/OBJLoader.js'></script>
<!-- shaders -->
<script type="text/x-glsl" id="vertex">
varying vec3 vNormal;
varying vec3 vPosition;
varying vec2 uVv;
void main() {
vec4 vPos = modelViewMatrix * vec4( position, 1.0 );
vPosition = vPos.xyz;
vNormal = normalMatrix * normal;
uVv = uv;
gl_Position = projectionMatrix * vPos;
}
</script>
<script type="text/x-glsl" id="fragment">
varying vec3 vNormal;
varying vec3 vPosition;
varying vec2 uVv;
uniform vec3 pointLightPosition; // in world space
uniform vec3 clight;
uniform vec3 ambientLight;
uniform vec3 cspec;
uniform vec3 cdiff;
uniform float roughness;
uniform sampler2D normalMap;
uniform sampler2D aoMap;
uniform vec2 normalScale;
const float PI = 3.14159;
vec3 FSchlick(float lDoth) {
return (cspec + (vec3(1.0)-cspec)*pow(1.0 - lDoth,5.0));
}
float DGGX(float nDoth, float alpha) {
float alpha2 = alpha*alpha;
float d = nDoth*nDoth*(alpha2-1.0)+1.0;
return ( alpha2 / (PI*d*d));
}
float G1(float dotProduct, float k) {
return (dotProduct / (dotProduct*(1.0-k) + k) );
}
float GSmith(float nDotv, float nDotl) {
float k = roughness*roughness;
return G1(nDotl,k)*G1(nDotv,k);
}
#extension GL_OES_standard_derivatives : enable
vec3 perturbNormal2Arb( vec3 eye_pos, vec3 surf_norm ) {
vec3 q0 = dFdx( eye_pos.xyz );
vec3 q1 = dFdy( eye_pos.xyz );
vec2 st0 = dFdx( uVv.st );
vec2 st1 = dFdy( uVv.st );
vec3 S = normalize( q0 * st1.t - q1 * st0.t );
vec3 T = normalize( -q0 * st1.s + q1 * st0.s );
vec3 N = surf_norm ;
vec3 mapN = normalize(texture2D( normalMap, uVv ).xyz * 2.0 - 1.0);
mapN.xy = normalScale * mapN.xy;
mat3 tsn = mat3( S, T, N );
return normalize( tsn * mapN );
}
void main() {
vec4 lPosition = viewMatrix * vec4( pointLightPosition, 1.0 );
vec3 l = normalize(lPosition.xyz - vPosition.xyz);
vec3 n = perturbNormal2Arb( vPosition, normalize( vNormal ));
vec3 v = normalize( -vPosition);
vec3 h = normalize( v + l);
// small quantity to prevent divisions by 0
float nDotl = max(dot( n, l ),0.000001);
float lDoth = max(dot( l, h ),0.000001);
float nDoth = max(dot( n, h ),0.000001);
float vDoth = max(dot( v, h ),0.000001);
float nDotv = max(dot( n, v ),0.000001);
vec3 fresnel = FSchlick(lDoth);
vec3 BRDF = (vec3(1.0)-fresnel)*cdiff/PI + fresnel*GSmith(nDotv,nDotl)*DGGX(nDoth,roughness*roughness)/
(4.0*nDotl*nDotv);
vec3 outRadiance = PI* clight * nDotl * BRDF + ambientLight*cdiff*texture2D( aoMap, uVv ).xyz;
// gamma encode the final value
gl_FragColor = vec4(pow( outRadiance, vec3(1.0/2.2)), 1.0);
}
</script>
<!-- three.js code -->
<script>
var renderer = new THREE.WebGLRenderer( { antialias: true } );
var camera = new THREE.PerspectiveCamera( 35, window.innerWidth / window.innerHeight, 1, 1000 );
var controls = new THREE.OrbitControls( camera, renderer.domElement );
var scene = new THREE.Scene();
// default: white, 1.0 intensity
var lightParameters = {
red: 1.0,
green: 1.0,
blue: 1.0,
intensity: 1.0,
}
var ambientLightParameters = {
red: 0.2,
green: 0.2,
blue: 0.2,
intensity: 1.0,
}
var textureParameters = {
normalScale: 0.0,
}
var normalMap = loadTexture( "textures/normal.jpg" );
var aoMap = loadTexture("textures/ao.jpg");
var uniforms = {
cspec: { type: "v3", value: new THREE.Vector3(0.04,0.04,0.04) },
cdiff: { type: "v3", value: new THREE.Vector3(0.7,0,0) },
roughness: {type: "f", value: 0.2},
normalMap: { type: "t", value: normalMap},
aoMap: { type: "t", value: aoMap},
normalScale: {type: "v2", value: new THREE.Vector2(1,1)},
pointLightPosition: { type: "v3", value: new THREE.Vector3() },
clight: { type: "v3", value: new THREE.Vector3() },
ambientLight: { type: "v3", value: new THREE.Vector3() },
};
vs = document.getElementById("vertex").textContent;
fs = document.getElementById("fragment").textContent;
var ourMaterial = new THREE.ShaderMaterial({ uniforms: uniforms, vertexShader: vs, fragmentShader: fs });
var loader = new THREE.OBJLoader();
loader.load( "models/ninjaHead_Low.obj", function ( group ) {
geometry = group.children[ 0 ].geometry;
geometry.center();
mesh = new THREE.Mesh( geometry, ourMaterial );
mesh.scale.multiplyScalar( 0.1 );
scene.add( mesh );
} );
var lightMesh = new THREE.Mesh( new THREE.SphereGeometry( 1, 16, 16),
new THREE.MeshBasicMaterial ({color: 0xffff00, wireframe:true}));
lightMesh.position.set( 7.0, 7.0, 7.0 );
uniforms.pointLightPosition.value = new THREE.Vector3(lightMesh.position.x,
lightMesh.position.y,
lightMesh.position.z);
var gui;
var stats = new Stats();
function loadTexture(file) {
var texture = new THREE.TextureLoader().load( file , function ( texture ) {
texture.minFilter = THREE.LinearMipMapLinearFilter;
texture.anisotropy = renderer.getMaxAnisotropy();
texture.wrapS = texture.wrapT = THREE.RepeatWrapping;
texture.offset.set( 0, 0 );
texture.needsUpdate = true;
render();
} )
return texture;
}
function init() {
renderer.setClearColor( 0xf0f0f0 );
camera.position.set( 0, 0, 10 );
scene.add( camera );
scene.add(lightMesh);
document.body.appendChild( renderer.domElement );
renderer.setPixelRatio( window.devicePixelRatio );
renderer.setSize( window.innerWidth, window.innerHeight );
controls.minDistance = 1;
controls.maxDistance = 100;
controls.enablePan = false;
controls.update();
window.addEventListener( 'resize', onResize, false );
stats.domElement.style.position = 'absolute';
stats.domElement.style.top = '0px';
document.body.appendChild( stats.domElement );
ourMaterial.needsUpdate = true;
}
function onResize() {
renderer.setSize( window.innerWidth, window.innerHeight );
camera.aspect = ( window.innerWidth / window.innerHeight );
camera.updateProjectionMatrix();
}
function update() {
requestAnimationFrame( update );
stats.update();
render();
}
function render() {
updateUniforms();
renderer.render( scene, camera );
}
function clearGui() {
if ( gui ) gui.destroy();
gui = new dat.GUI();
gui.open();
}
function buildGui() {
clearGui();
lightSettings = gui.addFolder('Light Parameters');
lightSettings.add(lightParameters,'red').min(0).max(1).onChange( function(newVal) { render() });
lightSettings.add(lightParameters,'green').min(0).max(1).onChange( function(newVal) { render() });
lightSettings.add(lightParameters,'blue').min(0).max(1).onChange( function(newVal) { render() });
lightSettings.add(lightParameters,'intensity').min(0).max(10000).onChange( function(newVal) { render() });
ambientLightSettings = gui.addFolder('Ambient Light Parameters');
ambientLightSettings.add(ambientLightParameters,'red').min(0).max(1).onChange( function(newVal) { render() });
ambientLightSettings.add(ambientLightParameters,'green').min(0).max(1).onChange( function(newVal) { render() });
ambientLightSettings.add(ambientLightParameters,'blue').min(0).max(1).onChange( function(newVal) { render() });
ambientLightSettings.add(ambientLightParameters,'intensity').min(0).max(10000).onChange( function(newVal) { render() });
textureSettings = gui.addFolder('Texture parameters');
textureSettings.add(textureParameters,'normalScale').min(-3).max(3).onChange( function( newVal ) {render()});
}
function updateUniforms() {
uniforms.clight.value = new THREE.Vector3(
lightParameters.red * lightParameters.intensity,
lightParameters.green * lightParameters.intensity,
lightParameters.blue * lightParameters.intensity);
uniforms.ambientLight.value = new THREE.Vector3(
ambientLightParameters.red * ambientLightParameters.intensity,
ambientLightParameters.green * ambientLightParameters.intensity,
ambientLightParameters.blue * ambientLightParameters.intensity);
uniforms.normalScale.value = new THREE.Vector2( textureParameters.normalScale, textureParameters.normalScale );
}
init();
buildGui();
update();
render();
</script>
</body>
</html>