Updated builds

build/three.js

@@ -2436,19 +2436,21 @@
 
 			}
 
-			var sinHalfTheta = Math.sqrt( 1.0 - cosHalfTheta * cosHalfTheta );
+			var sqrSinHalfTheta = 1.0 - cosHalfTheta * cosHalfTheta;
 
-			if ( Math.abs( sinHalfTheta ) < 0.001 ) {
+			if ( sqrSinHalfTheta <= Number.EPSILON ) {
 
-				this._w = 0.5 * ( w + this._w );
-				this._x = 0.5 * ( x + this._x );
-				this._y = 0.5 * ( y + this._y );
-				this._z = 0.5 * ( z + this._z );
+				var s = 1 - t;
+				this._w = s * w + t * this._w;
+				this._x = s * x + t * this._x;
+				this._y = s * y + t * this._y;
+				this._z = s * z + t * this._z;
 
-				return this;
+				return this.normalize();
 
 			}
 
+			var sinHalfTheta = Math.sqrt( sqrSinHalfTheta );
 			var halfTheta = Math.atan2( sinHalfTheta, cosHalfTheta );
 			var ratioA = Math.sin( ( 1 - t ) * halfTheta ) / sinHalfTheta,
 				ratioB = Math.sin( t * halfTheta ) / sinHalfTheta;
@@ -22681,7 +22683,7 @@
 
 		this.renderBufferDirect = function ( camera, fog, geometry, material, object, group ) {
 
-			var frontFaceCW = ( object.isMesh && object.matrixWorld.determinant() < 0 );
+			var frontFaceCW = ( object.isMesh && object.normalMatrix.determinant() < 0 );
 
 			state.setMaterial( material, frontFaceCW );
 
@@ -23411,7 +23413,7 @@
 
 			if ( object.isImmediateRenderObject ) {
 
-				var frontFaceCW = ( object.isMesh && object.matrixWorld.determinant() < 0 );
+				var frontFaceCW = ( object.isMesh && object.normalMatrix.determinant() < 0 );
 
 				state.setMaterial( material, frontFaceCW );
 
@@ -39436,6 +39438,8 @@
 
 			}
 
+			return this;
+
 		},
 
 		getFilter: function () {
@@ -39461,6 +39465,8 @@
 			this.gain.connect( this.filter );
 			this.filter.connect( this.context.destination );
 
+			return this;
+
 		},
 
 		getMasterVolume: function () {
@@ -39473,6 +39479,8 @@
 
 			this.gain.gain.setTargetAtTime( value, this.context.currentTime, 0.01 );
 
+			return this;
+
 		},
 
 		updateMatrixWorld: ( function () {
@@ -39866,6 +39874,8 @@
 
 			this.panner.refDistance = value;
 
+			return this;
+
 		},
 
 		getRolloffFactor: function () {
@@ -39878,6 +39888,8 @@
 
 			this.panner.rolloffFactor = value;
 
+			return this;
+
 		},
 
 		getDistanceModel: function () {
@@ -39890,6 +39902,8 @@
 
 			this.panner.distanceModel = value;
 
+			return this;
+
 		},
 
 		getMaxDistance: function () {
@@ -39902,6 +39916,8 @@
 
 			this.panner.maxDistance = value;
 
+			return this;
+
 		},
 
 		updateMatrixWorld: ( function () {

build/three.module.js

@@ -2430,19 +2430,21 @@ Object.assign( Quaternion.prototype, {
 
 		}
 
-		var sinHalfTheta = Math.sqrt( 1.0 - cosHalfTheta * cosHalfTheta );
+		var sqrSinHalfTheta = 1.0 - cosHalfTheta * cosHalfTheta;
 
-		if ( Math.abs( sinHalfTheta ) < 0.001 ) {
+		if ( sqrSinHalfTheta <= Number.EPSILON ) {
 
-			this._w = 0.5 * ( w + this._w );
-			this._x = 0.5 * ( x + this._x );
-			this._y = 0.5 * ( y + this._y );
-			this._z = 0.5 * ( z + this._z );
+			var s = 1 - t;
+			this._w = s * w + t * this._w;
+			this._x = s * x + t * this._x;
+			this._y = s * y + t * this._y;
+			this._z = s * z + t * this._z;
 
-			return this;
+			return this.normalize();
 
 		}
 
+		var sinHalfTheta = Math.sqrt( sqrSinHalfTheta );
 		var halfTheta = Math.atan2( sinHalfTheta, cosHalfTheta );
 		var ratioA = Math.sin( ( 1 - t ) * halfTheta ) / sinHalfTheta,
 			ratioB = Math.sin( t * halfTheta ) / sinHalfTheta;
@@ -22675,7 +22677,7 @@ function WebGLRenderer( parameters ) {
 
 	this.renderBufferDirect = function ( camera, fog, geometry, material, object, group ) {
 
-		var frontFaceCW = ( object.isMesh && object.matrixWorld.determinant() < 0 );
+		var frontFaceCW = ( object.isMesh && object.normalMatrix.determinant() < 0 );
 
 		state.setMaterial( material, frontFaceCW );
 
@@ -23405,7 +23407,7 @@ function WebGLRenderer( parameters ) {
 
 		if ( object.isImmediateRenderObject ) {
 
-			var frontFaceCW = ( object.isMesh && object.matrixWorld.determinant() < 0 );
+			var frontFaceCW = ( object.isMesh && object.normalMatrix.determinant() < 0 );
 
 			state.setMaterial( material, frontFaceCW );
 
@@ -39430,6 +39432,8 @@ AudioListener.prototype = Object.assign( Object.create( Object3D.prototype ), {
 
 		}
 
+		return this;
+
 	},
 
 	getFilter: function () {
@@ -39455,6 +39459,8 @@ AudioListener.prototype = Object.assign( Object.create( Object3D.prototype ), {
 		this.gain.connect( this.filter );
 		this.filter.connect( this.context.destination );
 
+		return this;
+
 	},
 
 	getMasterVolume: function () {
@@ -39467,6 +39473,8 @@ AudioListener.prototype = Object.assign( Object.create( Object3D.prototype ), {
 
 		this.gain.gain.setTargetAtTime( value, this.context.currentTime, 0.01 );
 
+		return this;
+
 	},
 
 	updateMatrixWorld: ( function () {
@@ -39860,6 +39868,8 @@ PositionalAudio.prototype = Object.assign( Object.create( Audio.prototype ), {
 
 		this.panner.refDistance = value;
 
+		return this;
+
 	},
 
 	getRolloffFactor: function () {
@@ -39872,6 +39882,8 @@ PositionalAudio.prototype = Object.assign( Object.create( Audio.prototype ), {
 
 		this.panner.rolloffFactor = value;
 
+		return this;
+
 	},
 
 	getDistanceModel: function () {
@@ -39884,6 +39896,8 @@ PositionalAudio.prototype = Object.assign( Object.create( Audio.prototype ), {
 
 		this.panner.distanceModel = value;
 
+		return this;
+
 	},
 
 	getMaxDistance: function () {
@@ -39896,6 +39910,8 @@ PositionalAudio.prototype = Object.assign( Object.create( Audio.prototype ), {
 
 		this.panner.maxDistance = value;
 
+		return this;
+
 	},
 
 	updateMatrixWorld: ( function () {