Fixed an incorrect usage of Math.abs() in Quaternion.calculateW() (thanks @qxzkjp).

Author: hexus

CHANGELOG.md

@@ -4,17 +4,18 @@
 
 ### New Features
 
-* RenderTexture.resize will allow you to resize the underlying Render Texture to the new dimensions given. Doing this also clears the Render Texture at the same time (thanks @saqsun)
+* RenderTexture.resize will allow you to resize the underlying Render Texture to the new dimensions given. Doing this also clears the Render Texture at the same time (thanks @saqsun).
 * Rectangle.RandomOutside is a new function that takes two Rectangles, `outer` and `inner`, and returns a random point that falls within the outer rectangle but is always outside of the inner rectangle.
 
 ### Updates
 
-* The ForwardDiffuseLightPipeline, used by the Lights system, now sets a flag if the Scene doesn't contain any lights. All of the Game Objects now check this flag and don't even bother adding themselves to the batch if there are no lights in the Scene, as they'd never render anyway. This also avoids the ghost-image problem if you swap Scenes to a new Scene with the Light Manager enabled, but no actual lights defined. Fix #3707 (thanks @samvieten)
+* The ForwardDiffuseLightPipeline, used by the Lights system, now sets a flag if the Scene doesn't contain any lights. All of the Game Objects now check this flag and don't even bother adding themselves to the batch if there are no lights in the Scene, as they'd never render anyway. This also avoids the ghost-image problem if you swap Scenes to a new Scene with the Light Manager enabled, but no actual lights defined. Fix #3707 (thanks @samvieten).
 
 ### Bug Fixes
 
-* The Canvas RenderTexture drawImage method incorrectly set the values of the frame, causing them to appear wrongly scaled in the canvas renderer. Fix #3710 (thanks @saqsun)
-* Fixed `Matrix4.makeRotationAxis()`.
+* The Canvas RenderTexture drawImage method incorrectly set the values of the frame, causing them to appear wrongly scaled in the canvas renderer. Fix #3710 (thanks @saqsun).
+* Fixed `Math.Matrix4.makeRotationAxis()`.
+* Fixed an incorrect Math.abs in `Math.Quaternion.calculateW()` (thanks @qxzkjp).
 
 ## Version 3.9.0 - Yui - 24th May 2018
 

src/math/Quaternion.js

@@ -685,7 +685,7 @@ var Quaternion = new Class({
         var y = this.y;
         var z = this.z;
 
-        this.w = -Math.sqrt(Math.abs(1.0 - x * x - y * y - z * z));
+        this.w = -Math.sqrt(1.0 - x * x - y * y - z * z);
 
         return this;
     },