fix for issue #6612: Missing tiles in VR mode (regression w.r.t. Cesium 1.44)

CONTRIBUTORS.md

@@ -107,6 +107,8 @@ See [CONTRIBUTING.md](CONTRIBUTING.md) for details on how to contribute to Cesiu
    * [Jeremy Marzano](https://github.com/JeremyMarzano-ISPA/)
 * [Orbit Logic](http://www.orbitlogic.com)
    * [Roderick Green](https://github.com/roderickgreen/)
+* [Outdooractive](https://www.outdooractive.com)
+   * [Guillaume Lathoud](https://github.com/glathoud/)
 
 ## [Individual CLA](Documentation/Contributors/CLAs/individual-cla-agi-v1.0.txt)
 * [Victor Berchet](https://github.com/vicb)

Source/Widgets/CesiumWidget/CesiumWidget.js

@@ -120,10 +120,11 @@ define([
         var canvas = widget._canvas;
         var width = canvas.width;
         var height = canvas.height;
+        var useWebVR = widget._useWebVR = widget.scene._useWebVR;
         if (width !== 0 && height !== 0) {
             var frustum = widget._scene.camera.frustum;
             if (defined(frustum.aspectRatio)) {
-                frustum.aspectRatio = width / height;
+                frustum.aspectRatio = useWebVR  ?  (width >> 1) / height  :  width / height;
             } else {
                 frustum.top = frustum.right * (height / width);
                 frustum.bottom = -frustum.top;
@@ -672,7 +673,8 @@ define([
         var canvas = this._canvas;
         var width = canvas.clientWidth;
         var height = canvas.clientHeight;
-        if (!this._forceResize && this._canvasWidth === width && this._canvasHeight === height) {
+        var useWebVR = this.scene._useWebVR;
+        if (!this._forceResize && this._canvasWidth === width && this._canvasHeight === height && this._useWebVR === useWebVR) {
             return;
         }
         this._forceResize = false;