diff --git a/examples/opencv-aruco/worker.js b/examples/opencv-aruco/worker.js
index 952492a..dbcac80 100644
--- a/examples/opencv-aruco/worker.js
+++ b/examples/opencv-aruco/worker.js
@@ -189,8 +189,8 @@ self.addEventListener('message',  function(event){
             parameter.minMarkerDistanceRate = 0.05;
             parameter.cornerRefinementMethod = cv.CORNER_REFINE_SUBPIX; // cv.CORNER_REFINE_NONE;
             parameter.cornerRefinementWinSize = 5;
-            parameter.cornerRefinementMaxIterations = 30;
-            parameter.cornerRefinementMinAccuracy = 0.1;
+            parameter.cornerRefinementMaxIterations = 50;
+            parameter.cornerRefinementMinAccuracy = 0.01;
             parameter.markerBorderBits = 1;
             parameter.perspectiveRemovePixelPerCell = 4;
             //parameter.perspectiveRemovePixelPerCell = 2;
diff --git a/examples/opencv-face/index.html b/examples/opencv-face/index.html
index f6d891d..7ee32de 100644
--- a/examples/opencv-face/index.html
+++ b/examples/opencv-face/index.html
@@ -59,27 +59,6 @@
 		<script src="../libs/stats.js"></script>
 		<script type="module" src="../../polyfill/XRPolyfill.js"></script>
 		<script nomodule src="../../dist/webxr-polyfill.js"></script>
-		<script>
-			var cvStatusTxt = "";
-			
-			// Needed if you want to run the OpenCV code inside the web page.  Doesn't hurt to have it here
-			// otherwise.  We have it up here so it gets executed before opencv.js is loaded
-			var Module = {
-			preRun: [function() {
-				Module.FS_createPreloadedFile('/', 'haarcascade_eye.xml', 'haarcascade_eye.xml', true, false);
-				Module.FS_createPreloadedFile('/', 'haarcascade_frontalface_default.xml', 'haarcascade_frontalface_default.xml', true, false);
-				Module.FS_createPreloadedFile('/', 'haarcascade_profileface.xml', 'haarcascade_profileface.xml', true, false);
-			}],
-			onRuntimeInitialized: function() {
-				opencvIsReady();
-				},
-			setStatus: function(msg) {
-				cvStatusTxt = msg;
-			}
-			};
-		</script>
-		<!--script  src="opencv.js"></script-->
-
 		<script src="../common.js"></script>
 	</head>
 	<body>
@@ -94,6 +73,7 @@
 		</div>
 
 		<script>
+			var cvStatusTxt = "";
 			// set up for collecting different stats
 			var beginTime = ( performance || Date ).now(), prevTime = beginTime, frames = 0;			
 			var stats = new Stats();
@@ -415,48 +395,6 @@
 					cvImageCtx.resetTransform()
 				}
 			
-			// function imshow(canvasSource, mat) {
-				// var canvas=null;
-				// if(typeof canvasSource==="string") {
-				// 	canvas=document.getElementById(canvasSource)
-				// } else {
-				// 	canvas=canvasSource
-				// }
-				// if(!(canvas instanceof HTMLCanvasElement)) {
-				// 	throw new Error("Please input the valid canvas element or id.");
-				// 	return
-				// }
-				// if(!(mat instanceof cv.Mat)) {
-				// 	throw new Error("Please input the valid cv.Mat instance.");
-				// 	return
-				// }
-				// var img=new cv.Mat;
-				// var depth=mat.type()%8;
-				// var scale=depth<=cv.CV_8S?1:depth<=cv.CV_32S?1/256:255;
-				// var shift=depth===cv.CV_8S||depth===cv.CV_16S?128:0;
-				// mat.convertTo(img,cv.CV_8U,scale,shift);
-				// switch(img.type()) {
-				// 	case cv.CV_8UC1:
-				// 		cv.cvtColor(img,img,cv.COLOR_GRAY2RGBA);
-				// 		break;
-				// 	case cv.CV_8UC3:
-				// 		cv.cvtColor(img,img,cv.COLOR_RGB2RGBA);
-				// 		break;
-				// 	case cv.CV_8UC4:
-				// 		break;
-				// 	default:
-				// 		throw new Error("Bad number of channels (Source image must have 1, 3 or 4 channels)");
-				// 		return
-				// }
-				// var imgData=new ImageData(new Uint8ClampedArray(img.data),img.cols,img.rows);
-				// var ctx=canvas.getContext("2d");
-				// ctx.clearRect(0,0,canvas.width,canvas.height);
-				// canvas.width=imgData.width;
-				// canvas.height=imgData.height;
-				// ctx.putImageData(imgData,0,0);
-				// img.delete()
-			// }
-
 			}
 			function opencvIsReady() {
 				console.log('OpenCV.js is ready');
diff --git a/polyfill/XRSession.js b/polyfill/XRSession.js
index dfda122..888f7d0 100644
--- a/polyfill/XRSession.js
+++ b/polyfill/XRSession.js
@@ -16,6 +16,8 @@ export default class XRSession extends EventHandlerBase {
 		this._baseLayer = null
 		this._stageBounds = null
 
+		this._skip = false;
+
 		this._frameAnchors = []
 		this._tempMatrix = MatrixMath.mat4_generateIdentity()		
 		this._tempMatrix2 = MatrixMath.mat4_generateIdentity()		
@@ -53,12 +55,16 @@ export default class XRSession extends EventHandlerBase {
 		if(typeof callback !== 'function'){
 			throw 'Invalid callback'
 		}
-		var skip = false;
+		return this._handleRequestFrame(callback)
+	}
+
+    _handleRequestFrame(callback) {
 		return this._display._requestAnimationFrame(() => {
-			if (skip) {
-				skip = false;
-				return;
+			if (this._skip) {
+				this._skip = false;
+				return this._handleRequestFrame(callback)
 			}
+			//this._skip = true;  // try skipping every second raf
 			const frame = this._createPresentationFrame()
 			this._updateCameraAnchor(frame)
 
@@ -120,9 +126,9 @@ export default class XRSession extends EventHandlerBase {
 		MatrixMath.mat4_invert(this._tempMatrix, anchorCoords._poseModelMatrix)
 
 		// get camera to world by inverting world to camera
-		MatrixMath.mat4_invert(this._tempMatrix2, matrix)
-
-		MatrixMath.mat4_multiply(camera.viewMatrix, this._tempMatrix, this._tempMatrix2)
+		// MatrixMath.mat4_invert(this._tempMatrix2, matrix)
+		// MatrixMath.mat4_multiply(camera.viewMatrix, this._tempMatrix, this._tempMatrix2)
+		MatrixMath.mat4_multiply(camera.viewMatrix, this._tempMatrix, matrix)
 	}
 
 	setVideoFrameHandler(callback) {
diff --git a/polyfill/platform/ARKitWrapper.js b/polyfill/platform/ARKitWrapper.js
index fa7ad6f..09d68fa 100644
--- a/polyfill/platform/ARKitWrapper.js
+++ b/polyfill/platform/ARKitWrapper.js
@@ -962,6 +962,7 @@ export default class ARKitWrapper extends EventHandlerBase {
 		// wouldn't be rotating the content / UI)
 		detail.camera.arCamera = true;
 		var orientation = detail.camera.interfaceOrientation;
+		detail.camera.viewMatrix = detail.camera.inverse_viewMatrix;
 		// mat4.copy(this._mTemp, detail.camera.viewMatrix)
         switch (orientation) {
 			case 1: 
diff --git a/polyfill/reality/CameraReality.js b/polyfill/reality/CameraReality.js
index dc3776e..76a16fb 100644
--- a/polyfill/reality/CameraReality.js
+++ b/polyfill/reality/CameraReality.js
@@ -215,7 +215,9 @@ export default class CameraReality extends Reality {
 			// set from frame
 			var view = frame.views[0];
 
-			this._videoViewMatrix.set(view.viewMatrix);
+			//this._videoViewMatrix.set(view.viewMatrix);
+			MatrixMath.mat4_invert(this._videoViewMatrix, view.viewMatrix)
+			
 			this._videoProjectionMatrix.set(view.projectionMatrix)
 			
 			var camera = {
