disable internal worker; resync requests for next vid frame.

examples/common.js

@@ -179,9 +179,13 @@ class XRExampleBase {
 		// if this session is getting video frames, lets set up a callback.
 		// EVENTUALLY should look at properties on the session to see if user 
 		// approved it, but the app doesn't let us know this yet
-		this.session.requestVideoFrames(worker)
+		this.session.setVideoFrameHandler(worker)
 	}
 
+	requestVideoFrame() {
+		this.session.requestVideoFrame();
+	}
+	
 	/*
 	Extending classes should override this to set up the scene during class construction
 	*/

examples/simplecv/index.html

@@ -246,8 +246,9 @@
 							self.messageText = txt;
 						},0);
 						updateCVFPS();
-
+						self.requestVideoFrame();
 					}
+					
 					this.worker.addEventListener('error', (e) => { 
 						console.log("worker error:" + e) 
 					})

polyfill/XRSession.js

@@ -70,7 +70,7 @@ export default class XRSession extends EventHandlerBase {
 		})
 	}
 
-	requestVideoFrames(callback) {
+	setVideoFrameHandler(callback) {
 		if (callback instanceof Worker) {
 			var worker = callback;
 			callback = 	(ev => { 
@@ -86,6 +86,10 @@ export default class XRSession extends EventHandlerBase {
 		this._display.addEventListener("videoFrame", callback)
 	}
 
+	requestVideoFrame() {
+		this._display._requestVideoFrame();
+	}
+
 	_createPresentationFrame(){
 		return new XRPresentationFrame(this)
 	}

polyfill/display/FlatDisplay.js

@@ -210,7 +210,9 @@ export default class FlatDisplay extends XRDisplay {
 		} catch(e) {
 			console.error('computer vision callback error', e)
 		}
-		
+	}
+
+	_requestVideoFrame() {
         // Do whatever is needed with the image buffers here, and then call
 		// this._arKitWrapper.requestComputerVisionData() to request a new one
         this._arKitWrapper.requestComputerVisionData()

polyfill/platform/ARKitWrapper.js

@@ -40,25 +40,25 @@ export default class ARKitWrapper extends EventHandlerBase {
 		this._isInitialized = false
 		this._rawARData = null
 
-		// worker to convert buffers
-		var blobURL = this._buildWorkerBlob()
-		this._worker = new Worker(blobURL);
-		URL.revokeObjectURL(blobURL);
+		// // worker to convert buffers
+		// var blobURL = this._buildWorkerBlob()
+		// this._worker = new Worker(blobURL);
+		// URL.revokeObjectURL(blobURL);
 
-		var self = this;
-		this._worker.onmessage = function (ev) {
-			setTimeout(function () {
-				self.dispatchEvent(
-					new CustomEvent(
-						ARKitWrapper.COMPUTER_VISION_DATA,
-						{
-							source: self,
-							detail: ev.data
-						}
-					)
-				)	
-			})
-		}
+		// var self = this;
+		// this._worker.onmessage = function (ev) {
+		// 	setTimeout(function () {
+		// 		self.dispatchEvent(
+		// 			new CustomEvent(
+		// 				ARKitWrapper.COMPUTER_VISION_DATA,
+		// 				{
+		// 					source: self,
+		// 					detail: ev.data
+		// 				}
+		// 			)
+		// 		)	
+		// 	})
+		// }
 
 		this.lightIntensity = 1000;
 		/**