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blur.html
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<html>
<head>
<meta charset="utf-8">
<script type="text/javascript" src="three.js"></script>
<script type="text/javascript" src="dat.gui.min.js"></script>
<script src="TrackballControls.js"></script>
<script type="text/javascript" src="stackblur.js"></script>
</head>
<body style="background:#ececec; margin:0px; padding:0px" onmousemove="update()">
<canvas id="origCanvas" style="position: absolute; visibility:hidden;"></canvas>
<canvas id="imgCanvas" style="position: absolute; visibility:hidden;"></canvas>
<div id="container"></div>
<!-- ----- VERTEX SHADER ----- -->
<script id="vertex_shader" type="x-shader/x-vertex">
attribute vec4 tangent;
attribute float amplitude;
attribute float displacement;
varying vec3 vTangent;
varying vec3 vBinormal;
varying vec3 vNormal;
varying vec2 vUv;
varying vec3 vPointLightVector;
varying vec3 vViewPosition;
uniform vec3 uPointLightPos;
#ifdef VERTEX_TEXTURES
uniform sampler2D tDisplacement;
uniform float uDisplacementScale;
uniform float uDisplacementBias;
uniform float uDisplacementPostScale;
#endif
void main() {
vec4 mvPosition = modelViewMatrix * vec4( position, 1.0 );
vViewPosition = -mvPosition.xyz; // ah HA
vNormal = normalize( normalMatrix * normal );
//tangent and binormal vectors
vTangent = normalize( normalMatrix * tangent.xyz );
vBinormal = cross( vNormal, vTangent ) * tangent.w;
vBinormal = normalize( vBinormal );
vUv = uv;
// point light
vec4 lPosition = viewMatrix * vec4( uPointLightPos, 1.0 );
vPointLightVector = normalize( lPosition.xyz - mvPosition.xyz );
#ifdef VERTEX_TEXTURES
vec3 dv = texture2D( tDisplacement, vUv ).xyz;
float df = uDisplacementScale * dv.x + uDisplacementBias;
vec4 displacedPosition = vec4( vNormal.xyz * df * uDisplacementPostScale/100.0, 0.0 ) + mvPosition;
gl_Position = projectionMatrix * displacedPosition;
#else
gl_Position = projectionMatrix * mvPosition;
#endif
}
</script>
<!-- ----- FRAGMENT SHADER ----- -->
<script id="fragment_shader" type="x-shader/x-fragment">
#extension GL_OES_standard_derivatives : enable
uniform vec3 uPointLightPos;
uniform vec3 uAmbientLightColor;
uniform vec3 uPointLightColor;
uniform vec3 uAmbientColor;
uniform vec3 uDiffuseColor;
uniform vec3 uSpecularColor;
uniform float uShininess; //
uniform sampler2D tDiffuse;
uniform sampler2D tDisplacement;
uniform sampler2D tNormal;
uniform sampler2D tSpec; //
uniform sampler2D tOcc; //
uniform float tDiffuseOpacity;
uniform float uNormalScale; //
varying vec3 vTangent;
varying vec3 vBinormal;
varying vec3 vNormal;
varying vec2 vUv;
varying vec3 vPointLightVector;
varying vec3 vViewPosition;
uniform float uDisplacementPostScale;
uniform float bumpScale;
// Derivative maps - bump mapping unparametrized surfaces by Morten Mikkelsen
// http://mmikkelsen3d.blogspot.sk/2011/07/derivative-maps.html
// Evaluate the derivative of the height w.r.t. screen-space using forward differencing (listing 2)
vec2 dHdxy_fwd() {
vec2 dSTdx = dFdx( vUv );
vec2 dSTdy = dFdy( vUv );
float hll = bumpScale * texture2D( tDisplacement, vUv ).x;
float dBx = bumpScale * texture2D( tDisplacement, vUv + dSTdx ).x - hll;
float dBy = bumpScale * texture2D( tDisplacement, vUv + dSTdy ).x - hll;
return vec2( dBx, dBy );
}
vec3 perturbNormalArb( vec3 surf_pos, vec3 surf_norm, vec2 dHdxy ) {
vec3 vSigmaX = dFdx( surf_pos );
vec3 vSigmaY = dFdy( surf_pos );
vec3 vN = surf_norm; // normalized
vec3 R1 = cross( vSigmaY, vN );
vec3 R2 = cross( vN, vSigmaX );
float fDet = dot( vSigmaX, R1 );
vec3 vGrad = sign( fDet ) * ( dHdxy.x * R1 + dHdxy.y * R2 );
return normalize( abs( fDet ) * surf_norm - vGrad );
}
void main() {
vec4 diffuseTex = texture2D( tDiffuse, vUv ) * tDiffuseOpacity;
diffuseTex.a = tDiffuseOpacity;
// vec3 specTex = texture2D( tSpec, vUv ).xyz;
// vec3 occTex = texture2D( tOcc, vUv ).xyz;
vec3 normalTex = texture2D( tNormal, vUv ).xyz * 2.0 - 1.0;
mat3 tsb = mat3( vTangent, vBinormal, vNormal );
vec3 finalNormal = tsb * normalTex.rgb;
vec3 normal = normalize( finalNormal );
vec3 normal2 = normalize( finalNormal );
vec3 viewPosition = normalize( vViewPosition );
normal = perturbNormalArb( -vViewPosition, normal * vec3(100.0/(uDisplacementPostScale+1.0)), dHdxy_fwd() );
normal = normalize(normal);
// point light
vec4 pointDiffuse = vec4( 0.0, 0.0, 0.0, 0.0 );
vec4 pointSpecular = vec4( 0.0, 0.0, 0.0, 0.0 ); //
vec3 pointVector = normalize( vPointLightVector );
float dotProduct = dot( normal, pointVector );
float pointDiffuseWeight = max( dotProduct, 0.0 );
vec3 pointHalfVector = normalize( vPointLightVector + viewPosition );
// specular
float pointDotNormalHalf = max( dot( normal, pointHalfVector ), 0.0 );
float pointSpecularWeight = 0.0; //
pointSpecularWeight += max( pow( pointDotNormalHalf, uShininess ), 0.0 );
pointSpecular += vec4( uSpecularColor, 1.0 ) * vec4( uPointLightColor, 1.0 ) * pointSpecularWeight * pointDiffuseWeight;
if ( pointDotNormalHalf >= 0.0 ) pointSpecularWeight = pow( pointDotNormalHalf, uShininess ); // no spectex
pointDiffuse += vec4( uDiffuseColor, 1.0 ) * vec4( uPointLightColor, 1.0 ) * pointDiffuseWeight;
// all lights contribution summation
vec4 totalLight = vec4( uAmbientLightColor * uAmbientColor , 1.0 ); // orig
totalLight += vec4( uPointLightColor, 1.0 ) * ( pointDiffuse + pointSpecular );
// with texture
gl_FragColor = vec4( diffuseTex.xyz + totalLight.xyz, 1.0 );
// without texture
// gl_FragColor = vec4( totalLight.xyz, 1.0 );
}
</script>
<!-- ----- MAIN THREE.JS CODE ----- -->
<script type="text/javascript">
var camera, scene, renderer, container;
var light, ambientLight, pointLight, geometry, mesh;
var uniforms, attributes, material;
var heightmap, diffTexture, dispTexture;
var oimgc=document.getElementById("origCanvas");
var octx=oimgc.getContext("2d");
var imgc=document.getElementById("imgCanvas");
var ictx=imgc.getContext("2d");
function start() {
container = document.getElementById( 'container' );
// --- WebGl render
try {
renderer = new THREE.WebGLRenderer();
renderer.setSize( window.innerWidth, window.innerHeight );
renderer.autoClear = false;
container.appendChild( renderer.domElement );
}
catch (e) {
alert(e);
}
scene = new THREE.Scene();
// --- Camera
var fov = 15; // camera field-of-view in degrees
var width = renderer.domElement.width;
var height = renderer.domElement.height;
var aspect = width / height; // view aspect ratio
camera = new THREE.PerspectiveCamera( fov, aspect );
camera.position.z = -600;
camera.position.y = -800;
camera.lookAt(scene.position);
camera.updateMatrix();
controls = new THREE.TrackballControls( camera, renderer.domElement );
controls.rotateSpeed = 3.0;
controls.zoomSpeed = 1.2;
controls.panSpeed = 0.8;
controls.noZoom = false;
controls.noPan = false;
controls.staticMoving = true;
controls.dynamicDampingFactor = 0.3;
controls.addEventListener( 'change', render );
// --- Lights
ambientLight = new THREE.AmbientLight( 0xffffff );
scene.add( ambientLight );
pointLight = new THREE.PointLight( 0xffffff, 0.0 );
scene.add( pointLight );
pointLight.position.set(0, 300, -200);
var sphere = new THREE.SphereGeometry( 100, 8, 8 );
light = new THREE.Mesh( sphere, new THREE.MeshBasicMaterial( { color:0xffffff } ) );
light.position = pointLight.position;
light.scale.x = light.scale.y = light.scale.z = 0.05;
scene.add(light);
// MATERIAL
var ambient = 0x000000, diffuse = 0x666666, specular = 0xffffff, shininess = 50.0, scale = 100;
diffTexture = new THREE.Texture(oimgc);
dispTexture = new THREE.Texture(imgc);
heightmap = new Image();
heightmap.src = 'SRTM_US_scaled_512.jpg';
heightmap.onload = function() {
oimgc.width = heightmap.width;
oimgc.height = heightmap.height;
imgc.width = heightmap.width;
imgc.height = heightmap.height;
octx.drawImage(heightmap, 0, 0, heightmap.width, heightmap.height);
ictx.drawImage(heightmap, 0, 0, heightmap.width, heightmap.height);
drawImage(stackBlur(0), "img");
diffTexture.needsUpdate = true;
dispTexture.needsUpdate = true;
update();
};
var shader = THREE.ShaderLib[ "normalmap" ];
uniforms = THREE.UniformsUtils.clone( shader.uniforms );
uniforms[ "enableDisplacement" ] = { type: 'i', value: 1 };
uniforms[ "enableDiffuse" ] = { type: 'i', value: 0 };
uniforms[ "tDiffuse" ].value = dispTexture;
uniforms[ "tDiffuseOpacity" ] = { type: 'f', value: 1.0 };
uniforms[ "tDisplacement" ] = { type: 't', value: dispTexture };
uniforms[ "uDisplacementScale" ] = { type: 'f', value: 100 };
uniforms[ "tNormal" ] = { type: 't', value: new THREE.ImageUtils.loadTexture( 'flat.png' )};
uniforms[ "uDiffuseColor" ].value = new THREE.Color( diffuse );
uniforms[ "uSpecularColor" ].value = new THREE.Color( specular );
uniforms[ "uAmbientColor" ].value = new THREE.Color( ambient );
uniforms[ "uShininess" ].value = shininess;
uniforms[ "uPointLightPos"] = { type: "v3", value: pointLight.position },
uniforms[ "uPointLightColor" ] = {type: "c", value: new THREE.Color( pointLight.color )};
uniforms[ "uAmbientLightColor" ] = {type: "c", value: new THREE.Color( ambientLight.color )};
uniforms[ "uDisplacementPostScale" ] = {type: 'f', value: 50 };
uniforms[ "bumpScale" ] = { type: "f", value: 10 };
material = new THREE.ShaderMaterial( {
uniforms: uniforms,
vertexShader: document.getElementById( 'vertex_shader' ).textContent,
fragmentShader: document.getElementById( 'fragment_shader' ).textContent,
side: THREE.DoubleSide
} );
// GEOMETRY
geometry = new THREE.PlaneGeometry(512, 256, 51, 26);
geometry.computeTangents();
mesh = new THREE.Mesh( geometry, material);
mesh.rotation.y = Math.PI;
scene.add(mesh);
update();
}
function update() {
render();
controls.update(); // trackball interaction
}
function render() {
renderer.clear();
renderer.render(scene, camera);
}
//
// JAVASCRIPT IMAGE MANIPULATION
//
function log(n) {
console.log(n);
}
function imageFromCanvas(canvas) {
var m = canvas.width
var n = canvas.height
var data = canvas.getContext('2d').getImageData(0, 0, m, n).data
var image = new Array(m*n)
for (var i=0; i<n*m; i++) {
image[i] = data[i*4]
}
return image
}
function drawImage(image, canvas) {
// set destination canvas
c = document.getElementById(canvas+"Canvas");
context = c.getContext('2d')
var m = c.width
var n = c.height
// find range
minimum = 1000000000000000000
maximum = 0
first = true
var d = 0
for (var i=0; i<n*m; i++) {
try {d = image[i]}
catch(e) {log(e); log("i: "+i); log("image: "+image); break}
minimum = Math.min(minimum, d)
maximum = Math.max(maximum, d)
if (i == m*n-1) {
first = false
}
}
var finalImage = ictx.createImageData(m, n);
var data = finalImage.data // pixel data array of (width*height*4) elements
var contrast = 2
var distanceColor = { r : 255*contrast/255, g : 255*contrast/255, b : 255*contrast/255 }
var ceil = 255
var floor = 0
newmin = 1000000000000000
newmax = 0
// Convert to visible
for (var i=0; i<n*m; i++) {
d = image[i]
normd = ((ceil - floor) * (d - minimum))/(maximum - minimum) + floor
newmin = Math.min(newmin, normd)
newmax = Math.max(newmax, normd)
data[i*4+0] = normd
data[i*4+1] = normd
data[i*4+2] = normd
data[i*4+3] = 255
}
context.putImageData(finalImage, 0, 0)
geometry.normalsNeedUpdate = true;
geometry.tangentsNeedUpdate = true;
diffTexture.needsUpdate = true;
dispTexture.needsUpdate = true;
geometry.computeTangents();
update();
}
//
// GUI
//
var initDisp = function() {
this.scale = 50;
this.blur = 0;
this.resolution = 10;
}
window.onload = function() {
var disp = new initDisp();
var gui = new dat.GUI();
controller = gui.add(disp, 'scale', 0, 200);
controller.onChange(function(value) {
uniforms[ "uDisplacementPostScale" ].value = value;
});
bcontroller = gui.add(disp, 'blur', 0.0, 10.0);
bcontroller.onChange(function(value) {
drawImage(stackBlur(value), "img");
});
scontroller = gui.add(disp, 'resolution', 0, 100);
scontroller.onChange(function(value) {
scene.remove(mesh);
geometry = new THREE.PlaneGeometry(512, 256, parseInt(5.12*value), parseInt(2.56*value));
geometry.computeTangents();
mesh = new THREE.Mesh( geometry, material);
mesh.rotation.y = Math.PI;
scene.add(mesh);
});
start();
update();
};
</script>
</body>
</html>