After a mammoth debugging session we now have advanced physics colliding and responding accurately :)

Phaser/math/Transform.ts

@@ -23,12 +23,8 @@ module Phaser {
             this.c = Math.cos(angle);
             this.s = Math.sin(angle);
 
-            this._tempVec = new Phaser.Vec2;
-
         }
 
-        private _tempVec: Phaser.Vec2;
-
         public t: Phaser.Vec2;
         public c: number;
         public s: number;
@@ -68,28 +64,6 @@ module Phaser {
 
         }
 
-        public rotate(v:Phaser.Vec2):Phaser.Vec2 {
-            return this._tempVec.setTo(v.x * this.c - v.y * this.s, v.x * this.s + v.y * this.c);
-        }
-
-        public unrotate(v:Phaser.Vec2):Phaser.Vec2 {
-            return this._tempVec.setTo(v.x * this.c + v.y * this.s, -v.x * this.s + v.y * this.c);
-        }
-
-        public transform(v:Phaser.Vec2):Phaser.Vec2 {
-            return this._tempVec.setTo(v.x * this.c - v.y * this.s + this.t.x, v.x * this.s + v.y * this.c + this.t.y);
-        }
-
-        public untransform(v:Phaser.Vec2):Phaser.Vec2 {
-
-            var px = v.x - this.t.x;
-            var py = v.y - this.t.y;
-
-            //  expensive - check for alternatives
-            return this._tempVec.setTo(px * this.c + py * this.s, -px * this.s + py * this.c);
-
-        }
-
     }
 
 }

Phaser/math/TransformUtils.ts

@@ -0,0 +1,39 @@
+/// <reference path="../Game.ts" />
+/// <reference path="Vec2.ts" />
+/// <reference path="Transform.ts" />
+
+/**
+* Phaser - TransformUtils
+*
+* A collection of methods useful for manipulating and performing operations on 2D Transforms.
+*
+*/
+
+module Phaser {
+
+    export class TransformUtils {
+
+        public static rotate(t: Transform, v:Phaser.Vec2, out?: Vec2 = new Vec2):Phaser.Vec2 {
+            return out.setTo(v.x * t.c - v.y * t.s, v.x * t.s + v.y * t.c);
+        }
+
+        public static unrotate(t: Transform, v:Phaser.Vec2, out?: Vec2 = new Vec2):Phaser.Vec2 {
+            return out.setTo(v.x * t.c + v.y * t.s, -v.x * t.s + v.y * t.c);
+        }
+
+        public static transform(t: Transform, v:Phaser.Vec2, out?: Vec2 = new Vec2):Phaser.Vec2 {
+            return out.setTo(v.x * t.c - v.y * t.s + t.t.x, v.x * t.s + v.y * t.c + t.t.y);
+        }
+
+        public static untransform(t: Transform, v:Phaser.Vec2, out?: Vec2 = new Vec2):Phaser.Vec2 {
+
+            var px = v.x - t.t.x;
+            var py = v.y - t.t.y;
+
+            return out.setTo(px * t.c + py * t.s, -px * t.s + py * t.c);
+
+        }
+
+    }
+
+}

Phaser/math/Vec2Utils.ts

@@ -1,5 +1,5 @@
 /// <reference path="../Game.ts" />
-/// <reference path="../math/Vec2.ts" />
+/// <reference path="Vec2.ts" />
 
 /**
 * Phaser - Vec2Utils