Added ImageUtils.getNormalMap.

Updated Tween.js (thx @jeromeetienne)

examples/js/Tween.js

@@ -1,5 +1,5 @@
-// tween.js r1 - http://github.com/sole/tween.js
-var TWEEN=TWEEN||function(){var a,e,c,d,f=[];return{start:function(g){c=setInterval(this.update,1E3/(g||60))},stop:function(){clearInterval(c)},add:function(g){f.push(g)},remove:function(g){a=f.indexOf(g);a!==-1&&f.splice(a,1)},update:function(){a=0;e=f.length;for(d=(new Date).getTime();a<e;)if(f[a].update(d))a++;else{f.splice(a,1);e--}}}}();
+// tween.js r2 - http://github.com/sole/tween.js
+var TWEEN=TWEEN||function(){var a,e,c,d,f=[];return{start:function(g){c=setInterval(this.update,1E3/(g||60))},stop:function(){clearInterval(c)},add:function(g){f.push(g)},getAll:function(){return f},removeAll:function(){f=[]},remove:function(g){a=f.indexOf(g);a!==-1&&f.splice(a,1)},update:function(){a=0;e=f.length;for(d=(new Date).getTime();a<e;)if(f[a].update(d))a++;else{f.splice(a,1);e--}}}}();
 TWEEN.Tween=function(a){var e={},c={},d={},f=1E3,g=0,j=null,n=TWEEN.Easing.Linear.EaseNone,k=null,l=null,m=null;this.to=function(b,h){if(h!==null)f=h;for(var i in b)if(a[i]!==null)d[i]=b[i];return this};this.start=function(){TWEEN.add(this);j=(new Date).getTime()+g;for(var b in d)if(a[b]!==null){e[b]=a[b];c[b]=d[b]-a[b]}return this};this.stop=function(){TWEEN.remove(this);return this};this.delay=function(b){g=b;return this};this.easing=function(b){n=b;return this};this.chain=function(b){k=b};this.onUpdate=
 function(b){l=b;return this};this.onComplete=function(b){m=b;return this};this.update=function(b){var h,i;if(b<j)return true;b=(b-j)/f;b=b>1?1:b;i=n(b);for(h in c)a[h]=e[h]+c[h]*i;l!==null&&l.call(a,i);if(b==1){m!==null&&m.call(a);k!==null&&k.start();return false}return true}};TWEEN.Easing={Linear:{},Quadratic:{},Cubic:{},Quartic:{},Quintic:{},Sinusoidal:{},Exponential:{},Circular:{},Elastic:{},Back:{},Bounce:{}};TWEEN.Easing.Linear.EaseNone=function(a){return a};
 TWEEN.Easing.Quadratic.EaseIn=function(a){return a*a};TWEEN.Easing.Quadratic.EaseOut=function(a){return-a*(a-2)};TWEEN.Easing.Quadratic.EaseInOut=function(a){if((a*=2)<1)return 0.5*a*a;return-0.5*(--a*(a-2)-1)};TWEEN.Easing.Cubic.EaseIn=function(a){return a*a*a};TWEEN.Easing.Cubic.EaseOut=function(a){return--a*a*a+1};TWEEN.Easing.Cubic.EaseInOut=function(a){if((a*=2)<1)return 0.5*a*a*a;return 0.5*((a-=2)*a*a+2)};TWEEN.Easing.Quartic.EaseIn=function(a){return a*a*a*a};

src/extras/ImageUtils.js

@@ -1,13 +1,13 @@
 /**
  * @author alteredq / http://alteredqualia.com/
+ * @author mrdoob / http://mrdoob.com/
  */
 
 THREE.ImageUtils = {
 
 	loadTexture: function ( path, mapping, callback ) {
 
-		var image = new Image(),
-			texture = new THREE.Texture( image, mapping );
+		var image = new Image(), texture = new THREE.Texture( image, mapping );
 
 		image.onload = function () { texture.needsUpdate = true; if ( callback ) callback( this ); };
 		image.crossOrigin = '';
@@ -19,9 +19,7 @@ THREE.ImageUtils = {
 
 	loadTextureCube: function ( array, mapping, callback ) {
 
-		var i, l, 
-			images = [],
-			texture = new THREE.Texture( images, mapping );
+		var i, l, images = [], texture = new THREE.Texture( images, mapping );
 
 		images.loadCount = 0;
 
@@ -43,6 +41,108 @@ THREE.ImageUtils = {
 
 		return texture;
 
+	},
+
+	getNormalMap: function ( image, depth ) {
+
+		// Adapted from http://www.paulbrunt.co.uk/lab/heightnormal/
+
+		var cross = function ( a, b ) {
+
+			return [ a[ 1 ] * b[ 2 ] - a[ 2 ] * b[ 1 ], a[ 2 ] * b[ 0 ] - a[ 0 ] * b[ 2 ], a[ 0 ] * b[ 1 ] - a[ 1 ] * b[ 0 ] ];
+
+		}
+
+		var subtract = function ( a, b ) {
+
+			return [ a[ 0 ] - b[ 0 ], a[ 1 ] - b[ 1 ], a[ 2 ] - b[ 2 ] ];
+
+		}
+
+		var normalize = function ( a ) {
+
+			var l = Math.sqrt( a[ 0 ] * a[ 0 ] + a[ 1 ] * a[ 1 ] + a[ 2 ] * a[ 2 ] );
+			return [ a[ 0 ] / l, a[ 1 ] / l, a[ 2 ] / l ];
+
+		}
+
+		var depth = depth | 1;
+		var width = image.width;
+		var height = image.height;
+
+		var canvas = document.createElement( 'canvas' );
+		canvas.width = width;
+		canvas.height = height;
+
+		var context = canvas.getContext( '2d' );
+		context.drawImage( image, 0, 0 );
+
+		var data = context.getImageData( 0, 0, width, height ).data;
+		var imageData = context.createImageData( width, height );
+		var output = imageData.data;
+
+		for ( var x = 0; x < width; x ++ ) {
+
+			for ( var y = 1; y < height; y ++ ) {
+
+				var ly = y - 1 < 0 ? height - 1 : y - 1;
+				var uy = ( y + 1 ) % height;
+				var lx = x - 1 < 0 ? width - 1 : x - 1;
+				var ux = ( x + 1 ) % width;
+
+				var points = [];
+				var origin = [ 0, 0, data[ ( y * width + x ) * 4 ] / 255 * depth ];
+				points.push( [ - 1, 0, data[ ( y * width + lx ) * 4 ] / 255 * depth ] );
+				points.push( [ - 1, - 1, data[ ( ly * width + lx ) * 4 ] / 255 * depth ] );
+				points.push( [ 0, - 1, data[ ( ly * width + x ) * 4 ] / 255 * depth ] );
+				points.push( [  1, - 1, data[ ( ly * width + ux ) * 4 ] / 255 * depth ] );
+				points.push( [ 1, 0, data[ ( y * width + ux ) * 4 ] / 255 * depth ] );
+				points.push( [ 1, 1, data[ ( uy * width + ux ) * 4 ] / 255 * depth ] );
+				points.push( [ 0, 1, data[ ( uy * width + x ) * 4 ] / 255 * depth ] );
+				points.push( [ - 1, 1, data[ ( uy * width + lx ) * 4 ] / 255 * depth ] );
+
+				var normals = [];
+				var num_points = points.length;
+
+				for ( var i = 0; i < num_points; i ++ ) {
+
+					var v1 = points[ i ];
+					var v2 = points[ ( i + 1 ) % num_points ];
+					v1 = subtract( v1, origin );
+					v2 = subtract( v2, origin );
+					normals.push( normalize( cross( v1, v2 ) ) );
+
+				}
+
+				var normal = [ 0, 0, 0 ];
+
+				for ( var i = 0; i < normals.length; i ++ ) {
+
+					normal[ 0 ] += normals[ i ][ 0 ];
+					normal[ 1 ] += normals[ i ][ 1 ];
+					normal[ 2 ] += normals[ i ][ 2 ];
+
+				}
+
+				normal[ 0 ] /= normals.length;
+				normal[ 1 ] /= normals.length;
+				normal[ 2 ] /= normals.length;
+
+				var idx = ( y * width + x ) * 4;
+
+				output[ idx ] = ( ( normal[ 0 ] + 1.0 ) / 2.0 * 255 ) | 0;
+				output[ idx + 1 ] = ( ( normal[ 1 ] + 1.0 / 2.0 ) * 255 ) | 0;
+				output[ idx + 2 ] = ( normal[ 2 ] * 255 ) | 0;
+				output[ idx + 3 ] = 255;
+
+			}
+
+		}
+
+		context.putImageData( imageData, 0, 0 );
+
+		return canvas;
+
 	}
 
 };