diff --git a/samples/transform-pin/moai.png b/samples/transform-pin/moai.png
deleted file mode 100644
index 8a9974bd65..0000000000
Binary files a/samples/transform-pin/moai.png and /dev/null differ
diff --git a/samples/transform-pin/run.bat b/samples/transform-pin/run.bat
deleted file mode 100644
index d5fad5e750..0000000000
--- a/samples/transform-pin/run.bat
+++ /dev/null
@@ -1,24 +0,0 @@
-::----------------------------------------------------------------::
-:: Copyright (c) 2010-2017 Zipline Games, Inc.
-:: All Rights Reserved.
-:: http://getmoai.com
-::----------------------------------------------------------------::
-
-@echo off
-
-:: verify paths
-if not exist "%MOAI_BIN%\moai.exe" (
-	echo.
-	echo --------------------------------------------------------------------------------
-	echo ERROR: The MOAI_BIN environment variable either doesn't exist or it's pointing
-	echo to an invalid path. Please point it at a folder containing moai.exe.
-	echo --------------------------------------------------------------------------------
-	echo.
-	goto end
-)
-
-:: run moai
-"%MOAI_BIN%\moai" "main.lua"
-
-:end
-pause
\ No newline at end of file
diff --git a/samples/transform-pin/run.sh b/samples/transform-pin/run.sh
deleted file mode 100755
index 612def2f86..0000000000
--- a/samples/transform-pin/run.sh
+++ /dev/null
@@ -1,20 +0,0 @@
-#!/bin/sh
-#--------------------------------------------------------------------------------------
-# Copyright (c) 2010-2013 Zipline Games, Inc.
-# All Rights Reserved.
-# http://getmoai.com
-#--------------------------------------------------------------------------------------
-
-cd `dirname $0`
-
-# Verify paths
-if [ ! -f "$MOAI_BIN/moai" ]; then
-    echo "---------------------------------------------------------------------------"
-    echo "Error: The MOAI_BIN environment variable doesn't exist or its pointing to an"
-    echo "invalid path.  Please point it at a folder containing moai executable"
-    echo "---------------------------------------------------------------------------"
-    exit 1
-fi
-
-# Run moai
-$MOAI_BIN/moai main.lua
diff --git a/src/moai-sim/MOAICamera.cpp b/src/moai-sim/MOAICamera.cpp
index 2b6545c04a..728b51d55e 100644
--- a/src/moai-sim/MOAICamera.cpp
+++ b/src/moai-sim/MOAICamera.cpp
@@ -415,7 +415,7 @@ ZLMatrix4x4 MOAICamera::GetProjMtx ( const MOAIViewport& viewport ) const {
 				float xScale = ( 2.0f / viewport.Width ()) * viewScale.mX;
 				float yScale = ( 2.0f / viewport.Height ()) * viewScale.mY;
 				
-				mtx.Scale ( xScale, yScale, 0.0 );
+				mtx.Scale ( xScale, yScale, -1.0 ); // Z must be non-zero to produce invertible projection matrix
 			}
 		}
 	}
diff --git a/src/moai-sim/MOAIViewport.cpp b/src/moai-sim/MOAIViewport.cpp
index 27d2faad40..841ae76a38 100644
--- a/src/moai-sim/MOAIViewport.cpp
+++ b/src/moai-sim/MOAIViewport.cpp
@@ -200,7 +200,7 @@ ZLMatrix4x4 MOAIViewport::GetProjMtx () const {
 	float xScale = ( 2.0f / rect.Width ()) * viewScale.mX;
 	float yScale = ( 2.0f / rect.Height ()) * viewScale.mY;
 	
-	mtx.Scale ( xScale, yScale, -1.0f );
+	mtx.Scale ( xScale, yScale, -1.0f ); // Z must be non-zero to produce invertible projection matrix
 	proj.Append ( mtx );
 	
 	// offset