Simplify if statement, as the other methods in Box2 and 3

src/math/Box2.js

@@ -129,27 +129,13 @@ Box2.prototype = {
 
 	containsPoint: function ( point ) {
 
-		if ( point.x < this.min.x || point.x > this.max.x ||
-		     point.y < this.min.y || point.y > this.max.y ) {
-
-			return false;
-
-		}
-
-		return true;
+		return !(point.x < this.min.x || point.x > this.max.x || point.y < this.min.y || point.y > this.max.y);
 
 	},
 
 	containsBox: function ( box ) {
 
-		if ( ( this.min.x <= box.min.x ) && ( box.max.x <= this.max.x ) &&
-		     ( this.min.y <= box.min.y ) && ( box.max.y <= this.max.y ) ) {
-
-			return true;
-
-		}
-
-		return false;
+		return ( this.min.x <= box.min.x ) && ( box.max.x <= this.max.x ) && ( this.min.y <= box.min.y ) && ( box.max.y <= this.max.y );
 
 	},
 
@@ -171,14 +157,7 @@ Box2.prototype = {
 
 		// using 6 splitting planes to rule out intersections.
 
-		if ( box.max.x < this.min.x || box.min.x > this.max.x ||
-		     box.max.y < this.min.y || box.min.y > this.max.y ) {
-
-			return false;
-
-		}
-
-		return true;
+		return !(box.max.x < this.min.x || box.min.x > this.max.x || box.max.y < this.min.y || box.min.y > this.max.y);
 
 	},
 

src/math/Box3.js

@@ -244,29 +244,13 @@ Box3.prototype = {
 
 	containsPoint: function ( point ) {
 
-		if ( point.x < this.min.x || point.x > this.max.x ||
-				 point.y < this.min.y || point.y > this.max.y ||
-				 point.z < this.min.z || point.z > this.max.z ) {
-
-			return false;
-
-		}
-
-		return true;
+		return !(point.x < this.min.x || point.x > this.max.x || point.y < this.min.y || point.y > this.max.y || point.z < this.min.z || point.z > this.max.z);
 
 	},
 
 	containsBox: function ( box ) {
 
-		if ( ( this.min.x <= box.min.x ) && ( box.max.x <= this.max.x ) &&
-			 ( this.min.y <= box.min.y ) && ( box.max.y <= this.max.y ) &&
-			 ( this.min.z <= box.min.z ) && ( box.max.z <= this.max.z ) ) {
-
-			return true;
-
-		}
-
-		return false;
+		return ( this.min.x <= box.min.x ) && ( box.max.x <= this.max.x ) && ( this.min.y <= box.min.y ) && ( box.max.y <= this.max.y ) && ( this.min.z <= box.min.z ) && ( box.max.z <= this.max.z );
 
 	},
 
@@ -289,15 +273,7 @@ Box3.prototype = {
 
 		// using 6 splitting planes to rule out intersections.
 
-		if ( box.max.x < this.min.x || box.min.x > this.max.x ||
-				 box.max.y < this.min.y || box.min.y > this.max.y ||
-				 box.max.z < this.min.z || box.min.z > this.max.z ) {
-
-			return false;
-
-		}
-
-		return true;
+		return !(box.max.x < this.min.x || box.min.x > this.max.x || box.max.y < this.min.y || box.min.y > this.max.y || box.max.z < this.min.z || box.min.z > this.max.z);
 
 	},