diff --git a/example-basic/example-basic.xcodeproj/project.xcworkspace/xcuserdata/joschow1.xcuserdatad/UserInterfaceState.xcuserstate b/example-basic/example-basic.xcodeproj/project.xcworkspace/xcuserdata/joschow1.xcuserdatad/UserInterfaceState.xcuserstate
index 899352b..a5734c8 100644
Binary files a/example-basic/example-basic.xcodeproj/project.xcworkspace/xcuserdata/joschow1.xcuserdatad/UserInterfaceState.xcuserstate and b/example-basic/example-basic.xcodeproj/project.xcworkspace/xcuserdata/joschow1.xcuserdatad/UserInterfaceState.xcuserstate differ
diff --git a/src/ARCam.mm b/src/ARCam.mm
index 4f70d5f..3cb5d8d 100644
--- a/src/ARCam.mm
+++ b/src/ARCam.mm
@@ -19,12 +19,13 @@
     }
     
     void ARCam::setup(bool debugMode){
+        nativeDimensions = ARCommon::getDeviceDimensions();
         ambientIntensity = 0.0;
         orientation = UIInterfaceOrientationPortrait;
         shouldBuildCameraFrame = true;
         this->debugMode = debugMode;
         needsPerspectiveAdjustment = false;
-        viewportSize = CGSizeMake(ofGetWindowWidth(), ofGetWindowHeight());
+        viewportSize = CGSizeMake(nativeDimensions.x,nativeDimensions.y);
         yTexture = NULL;
         CbCrTexture = NULL;
         near = 0.01;
diff --git a/src/ARUtils.h b/src/ARUtils.h
index 6698c87..603af57 100644
--- a/src/ARUtils.h
+++ b/src/ARUtils.h
@@ -51,6 +51,53 @@ namespace ARCommon {
     }
     
     
+    static ofVec2f getDeviceDimensions(){
+        CGRect screenBounds = [[UIScreen mainScreen] bounds];
+        
+        ofVec2f dimensions;
+        
+        
+        switch(UIDevice.currentDevice.orientation){
+            case UIDeviceOrientationFaceUp:
+                break;
+                
+            case UIDeviceOrientationFaceDown:
+                break;
+            case UIInterfaceOrientationUnknown:
+                dimensions.x = screenBounds.size.width;
+                dimensions.y = screenBounds.size.height;
+                
+                break;
+                
+                // upside down registers, but for some reason nothing happens :/
+                // leaving this here anyways.
+            case UIInterfaceOrientationPortraitUpsideDown:
+                dimensions.x = screenBounds.size.width;
+                dimensions.y = screenBounds.size.height;
+                
+                break;
+                
+            case UIInterfaceOrientationPortrait:
+                dimensions.x = screenBounds.size.width;
+                dimensions.y = screenBounds.size.height;
+                
+                
+                break;
+                
+            case UIInterfaceOrientationLandscapeLeft:
+                dimensions.x = screenBounds.size.height;
+                dimensions.y = screenBounds.size.width;
+                
+                break;
+                
+            case UIInterfaceOrientationLandscapeRight:
+                dimensions.x = screenBounds.size.height;
+                dimensions.y = screenBounds.size.width;
+                break;
+        }
+        
+        return dimensions;
+    }
    
     //! Gets the official resolution of the device you're currently using under the assumption that the width/height
     //! matches the current orientation your device is in(ie landscape gives longer width than portrait)