diff --git a/src/core/renderers/webgl/filters/filterTransforms.js b/src/core/renderers/webgl/filters/filterTransforms.js
index 6c60b04..ec86d38 100644
--- a/src/core/renderers/webgl/filters/filterTransforms.js
+++ b/src/core/renderers/webgl/filters/filterTransforms.js
@@ -26,40 +26,16 @@
 
 var calculateNormalizedScreenSpaceMatrix = function (outputMatrix, filterArea, textureSize)
 {
-    //var worldTransform = sprite.worldTransform.copy(math.Matrix.TEMP_MATRIX),
-    var texture = {width:800, height:600};//sprite._texture.baseTexture;
-
-    // TODO unwrap?
     var mappedMatrix = outputMatrix.identity();
 
-    // scale..
-    var ratio = textureSize.height / textureSize.width;
-
     mappedMatrix.translate(filterArea.x / textureSize.width, filterArea.y / textureSize.height );
 
-    // mappedMatrix.scale(1 , ratio);
-
-    var translateScaleX = (textureSize.width / texture.width);
-    var translateScaleY = (textureSize.height / texture.height);
-
-   // worldTransform.tx /= texture.width * translateScaleX;
-
-    //this...?  free beer for anyone who can explain why this makes sense!
-   // worldTransform.ty /= texture.width * translateScaleX;
-    // worldTransform.ty /= texture.height * translateScaleY;
-
-   // worldTransform.invert();
-   // mappedMatrix.prepend(worldTransform);
-
-    // apply inverse scale..
-    // mappedMatrix.scale(1 , 1/ratio);
+    var translateScaleX = (textureSize.width / filterArea.width);
+    var translateScaleY = (textureSize.height / filterArea.height);
 
     mappedMatrix.scale( translateScaleX , translateScaleY );
 
-   // mappedMatrix.translate(sprite.anchor.x, sprite.anchor.y);
-
     return mappedMatrix;
-
 };
 
 // this will map the filter coord so that a texture can be used based on the transform of a sprite

diff --git a/src/core/renderers/webgl/filters/filterTransforms.js b/src/core/renderers/webgl/filters/filterTransforms.js
index 6c60b04..ec86d38 100644
--- a/src/core/renderers/webgl/filters/filterTransforms.js
+++ b/src/core/renderers/webgl/filters/filterTransforms.js
@@ -26,40 +26,16 @@
 
 var calculateNormalizedScreenSpaceMatrix = function (outputMatrix, filterArea, textureSize)
 {
-    //var worldTransform = sprite.worldTransform.copy(math.Matrix.TEMP_MATRIX),
-    var texture = {width:800, height:600};//sprite._texture.baseTexture;
-
-    // TODO unwrap?
     var mappedMatrix = outputMatrix.identity();
 
-    // scale..
-    var ratio = textureSize.height / textureSize.width;
-
     mappedMatrix.translate(filterArea.x / textureSize.width, filterArea.y / textureSize.height );
 
-    // mappedMatrix.scale(1 , ratio);
-
-    var translateScaleX = (textureSize.width / texture.width);
-    var translateScaleY = (textureSize.height / texture.height);
-
-   // worldTransform.tx /= texture.width * translateScaleX;
-
-    //this...?  free beer for anyone who can explain why this makes sense!
-   // worldTransform.ty /= texture.width * translateScaleX;
-    // worldTransform.ty /= texture.height * translateScaleY;
-
-   // worldTransform.invert();
-   // mappedMatrix.prepend(worldTransform);
-
-    // apply inverse scale..
-    // mappedMatrix.scale(1 , 1/ratio);
+    var translateScaleX = (textureSize.width / filterArea.width);
+    var translateScaleY = (textureSize.height / filterArea.height);
 
     mappedMatrix.scale( translateScaleX , translateScaleY );
 
-   // mappedMatrix.translate(sprite.anchor.x, sprite.anchor.y);
-
     return mappedMatrix;
-
 };
 
 // this will map the filter coord so that a texture can be used based on the transform of a sprite
diff --git a/src/core/renderers/webgl/managers/FilterManager.js b/src/core/renderers/webgl/managers/FilterManager.js
index 7e0be12..0e4086b 100644
--- a/src/core/renderers/webgl/managers/FilterManager.js
+++ b/src/core/renderers/webgl/managers/FilterManager.js
@@ -321,12 +321,15 @@
     return filterTransforms.calculateScreenSpaceMatrix(outputMatrix,  currentState.sourceFrame, currentState.renderTarget.size);
 };
 
+/**
+ * Multiply vTextureCoord to this matrix to achieve (0,0,1,1) for filterArea
+ *
+ * @param outputMatrix {PIXI.Matrix}
+ */
 FilterManager.prototype.calculateNormalizedScreenSpaceMatrix = function (outputMatrix)
 {
     var currentState = this.filterData.stack[this.filterData.index];
 
-
-
     return filterTransforms.calculateNormalizedScreenSpaceMatrix(outputMatrix, currentState.sourceFrame, currentState.renderTarget.size, currentState.destinationFrame);
 };