Merge pull request #13121 from WestLangley/dev-quat

Fix Quaternion.conjugate method

src/math/Quaternion.js

@@ -395,7 +395,9 @@ Object.assign( Quaternion.prototype, {
 
 	inverse: function () {
 
-		return this.conjugate().normalize();
+		// quaternion is assumed to have unit length
+
+		return this.conjugate();
 
 	},