change to recommended reference space type in AR

Closing #7959

dist/preview release/what's new.md

@@ -72,6 +72,7 @@
 - Implemented the new WebXR HitTest API ([#7364](https://github.com/BabylonJS/Babylon.js/issues/7364)) ([RaananW](https://github.com/RaananW))
 - Playground doesn't update FPS when in XR in main and frame ([#7875](https://github.com/BabylonJS/Babylon.js/issues/7875)) ([RaananW](https://github.com/RaananW))
 - Added support for teleportation using pointer events ([RaananW](https://github.com/RaananW))
+- AR reference space type recommendation changed to 'unbounded' ([#7959](https://github.com/BabylonJS/Babylon.js/issues/7959)) ([RaananW](https://github.com/RaananW))
 
 ### Collisions
 

src/XR/webXRExperienceHelper.ts

@@ -101,9 +101,9 @@ export class WebXRExperienceHelper implements IDisposable {
         let sessionCreationOptions: XRSessionInit = {
             optionalFeatures: (referenceSpaceType !== "viewer" && referenceSpaceType !== "local") ? [referenceSpaceType] : []
         };
-        // we currently recommend "local" space in AR
-        if (sessionMode === "immersive-ar" && referenceSpaceType !== "local") {
-            Logger.Warn("We recommend using 'local' reference space type when using 'immersive-ar' session mode");
+        // we currently recommend "unbounded" space in AR (#7959)
+        if (sessionMode === "immersive-ar" && referenceSpaceType !== "unbounded") {
+            Logger.Warn("We recommend using 'unbounded' reference space type when using 'immersive-ar' session mode");
         }
         // make sure that the session mode is supported
         return this.sessionManager.isSessionSupportedAsync(sessionMode).then((supported) => {