1 /**
  2  * @author alteredq / http://alteredqualia.com/
  3  */
  4 
  5 /**@namespace*/
  6 THREE.Math = {
  7 
  8 	// Clamp value to range <a, b>
  9 
 10 	clamp: function ( x, a, b ) {
 11 
 12 		return ( x < a ) ? a : ( ( x > b ) ? b : x );
 13 
 14 	},
 15 
 16 	// Clamp value to range <a, inf)
 17 
 18 	clampBottom: function ( x, a ) {
 19 
 20 		return x < a ? a : x;
 21 
 22 	},
 23 
 24 	// Linear mapping from range <a1, a2> to range <b1, b2>
 25 
 26 	mapLinear: function ( x, a1, a2, b1, b2 ) {
 27 
 28 		return b1 + ( x - a1 ) * ( b2 - b1 ) / ( a2 - a1 );
 29 
 30 	},
 31 
 32 	// Random float from <0, 1> with 16 bits of randomness
 33 	// (standard Math.random() creates repetitive patterns when applied over larger space)
 34 
 35 	random16: function () {
 36 
 37 		return ( 65280 * Math.random() + 255 * Math.random() ) / 65535;
 38 
 39 	},
 40 
 41 	// Random integer from <low, high> interval
 42 
 43 	randInt: function ( low, high ) {
 44 
 45 		return low + Math.floor( Math.random() * ( high - low + 1 ) );
 46 
 47 	},
 48 
 49 	// Random float from <low, high> interval
 50 
 51 	randFloat: function ( low, high ) {
 52 
 53 		return low + Math.random() * ( high - low );
 54 
 55 	},
 56 
 57 	// Random float from <-range/2, range/2> interval
 58 
 59 	randFloatSpread: function ( range ) {
 60 
 61 		return range * ( 0.5 - Math.random() );
 62 
 63 	},
 64 
 65 	sign: function ( x ) {
 66 
 67 		return ( x < 0 ) ? -1 : ( ( x > 0 ) ? 1 : 0 );
 68 
 69 	}
 70 
 71 };
 72 

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