1 /**
  2  * @author alteredq / http://alteredqualia.com/
  3  * @author WestLangley / http://github.com/WestLangley
  4  */
  5 
  6 /**@constructor*/
  7 THREE.Matrix3 = function () {
  8 
  9 	this.elements = new Float32Array(9);
 10 
 11 };
 12 
 13 THREE.Matrix3.prototype = {
 14 
 15 	constructor: THREE.Matrix3,
 16 
 17 	multiplyVector3: function ( v ) {
 18 
 19 		var te = this.elements;
 20 
 21 		var vx = v.x, vy = v.y, vz = v.z;
 22 
 23 		v.x = te[0] * vx + te[3] * vy + te[6] * vz;
 24 		v.y = te[1] * vx + te[4] * vy + te[7] * vz;
 25 		v.z = te[2] * vx + te[5] * vy + te[8] * vz;
 26 
 27 		return v;
 28 
 29 	},
 30 
 31 	multiplyVector3Array: function ( a ) {
 32 
 33 		var tmp = THREE.Matrix3.__v1;
 34 
 35 		for ( var i = 0, il = a.length; i < il; i += 3 ) {
 36 
 37 			tmp.x = a[ i ];
 38 			tmp.y = a[ i + 1 ];
 39 			tmp.z = a[ i + 2 ];
 40 
 41 			this.multiplyVector3( tmp );
 42 
 43 			a[ i ]     = tmp.x;
 44 			a[ i + 1 ] = tmp.y;
 45 			a[ i + 2 ] = tmp.z;
 46 
 47 		}
 48 
 49 		return a;
 50 
 51 	},
 52 
 53 	getInverse: function ( matrix ) {
 54 
 55 		// input: THREE.Matrix4
 56 		// ( based on http://code.google.com/p/webgl-mjs/ )
 57 
 58 		var me = matrix.elements;
 59 
 60 		var a11 =   me[10] * me[5] - me[6] * me[9];
 61 		var a21 = - me[10] * me[1] + me[2] * me[9];
 62 		var a31 =   me[6] * me[1] - me[2] * me[5];
 63 		var a12 = - me[10] * me[4] + me[6] * me[8];
 64 		var a22 =   me[10] * me[0] - me[2] * me[8];
 65 		var a32 = - me[6] * me[0] + me[2] * me[4];
 66 		var a13 =   me[9] * me[4] - me[5] * me[8];
 67 		var a23 = - me[9] * me[0] + me[1] * me[8];
 68 		var a33 =   me[5] * me[0] - me[1] * me[4];
 69 
 70 		var det = me[0] * a11 + me[1] * a12 + me[2] * a13;
 71 
 72 		// no inverse
 73 
 74 		if ( det === 0 ) {
 75 
 76 			console.warn( "Matrix3.getInverse(): determinant == 0" );
 77 
 78 		}
 79 
 80 		var idet = 1.0 / det;
 81 
 82 		var m = this.elements;
 83 
 84 		m[ 0 ] = idet * a11; m[ 1 ] = idet * a21; m[ 2 ] = idet * a31;
 85 		m[ 3 ] = idet * a12; m[ 4 ] = idet * a22; m[ 5 ] = idet * a32;
 86 		m[ 6 ] = idet * a13; m[ 7 ] = idet * a23; m[ 8 ] = idet * a33;
 87 
 88 		return this;
 89 
 90 	},
 91 
 92 
 93 	transpose: function () {
 94 
 95 		var tmp, m = this.elements;
 96 
 97 		tmp = m[1]; m[1] = m[3]; m[3] = tmp;
 98 		tmp = m[2]; m[2] = m[6]; m[6] = tmp;
 99 		tmp = m[5]; m[5] = m[7]; m[7] = tmp;
100 
101 		return this;
102 
103 	},
104 
105 
106 	transposeIntoArray: function ( r ) {
107 
108 		var m = this.m;
109 
110 		r[ 0 ] = m[ 0 ];
111 		r[ 1 ] = m[ 3 ];
112 		r[ 2 ] = m[ 6 ];
113 		r[ 3 ] = m[ 1 ];
114 		r[ 4 ] = m[ 4 ];
115 		r[ 5 ] = m[ 7 ];
116 		r[ 6 ] = m[ 2 ];
117 		r[ 7 ] = m[ 5 ];
118 		r[ 8 ] = m[ 8 ];
119 
120 		return this;
121 
122 	}
123 
124 };
125 
126 THREE.Matrix3.__v1 = new THREE.Vector3();

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