Wikitude

Hi there,

So I get my 3d models and target collection files from my server. I then dynamically create the 3d models. Some of the 3d model files are as large as 50 MB and we are working to reduce that to 5-10 MB the most. But regardless of that, every time we startup the app, seems like the 3d files are locally downloaded and never deleted. So every time we use the app, the app size increases by 50-100 MB. Is there a way to release the storage somehow?

The part of the code that builds the 3d models:

_.forEach(this.nearbyEvent.targets, function(target) {
        console.log("target", target);
        // Only setup Image Rec if there are indeed some overlays available
        if (target.eventTargetOverlays && target.eventTargetOverlays.length > 0) {
          // First create the overlays for the target
          var overlayDrawables = [];
          _.forEach(target.eventTargetOverlays, function(overlay) {
            overlayDrawables.push(new AR.Model(overlay.overlayUrl, {
              onLoaded: World.loadingStepDone,
              translate: overlay.translate,
              scale: overlay.scale,
              rotate: overlay.rotate
            }));
          });
          // Then create the image trackable for the target
          var trackable = new AR.ImageTrackable(World.tracker, target.title, {
            drawables: {
              cam: overlayDrawables
            }
          });
          World.allTrackables.push(trackable);
        }
      });

Thanks in advance!

Thanks Eva,

I have tried your approach but unfortunately it didn't work. I also decided to load the models only `onImageRecognized` method. and I destroy them `onImageLost`. Here's my approach:

_.forEach(this.nearbyEvent.targets, function(target) {
        // Only setup Image Rec if there are indeed some overlays available
        if (target.eventTargetOverlays && target.eventTargetOverlays.length > 0) {
          World.overlays[target.title] = target.eventTargetOverlays;
          World.allTimeOuts[target.title] = undefined;
          // Create the image trackable for the target
          var trackable = new AR.ImageTrackable(World.tracker, target.title, {
            onImageRecognized: function(targetName) {
              // Only add drawable if they are not yet loaded
              if (trackable.drawables.cam.length === 0) {
                _.forEach(World.overlays[targetName], function (overlay) {
                    trackable.drawables.addCamDrawable(new AR.Model(overlay.overlayUrl, {
                      onLoaded: World.loadingStepDone,
                      translate: overlay.translate,
                      scale: overlay.scale,
                      rotate: overlay.rotate
                    }));
                });
                // Clear the timeout if timeout has not yet run
                if (World.allTimeOuts[targetName]) {
                  clearTimeout(World.allTimeOuts[targetName]);
                }
              }
            },
            onImageLost: function(targetName) {
              // Destroy the models/image if the user doesn't return to the target in 10 seconds
              if (trackable.drawables.cam.length > 0)
              World.allTimeOuts[targetName] = setTimeout(function(){
                _.forEach(trackable.drawables.cam, function(drawable) {
                  if (drawable) {
                    trackable.drawables.removeCamDrawable(drawable);
                    drawable.destroy();
                  }
                });
                World.allTimeOuts[targetName] = undefined;
              }, 3000);
            }
          });
          World.allTrackables.push(trackable);
        }
      });

I also have notice that the destroy function works fine and the model is not downloaded anymore once you move in and out of the target, but once you restart the app, the model is re-downloaded and adds to the app size in iPhone settings. Not sure how can you fully remove the model file from the app???

Any solution to this? Seems like I'm doing all the necessary steps as suggested here and other posts. Any help would be greatly appreciated.

Thanks Daniel. Does 7.1.0 has this fix?

Thanks Daniel for your quick response.  It really depends on the possible release date of 7.2 (I doubt it'd be any time soon :( ) A custom build would be greatly appreciate it since we'll be running this in a lot of events and there could be a lot of targets and models in each event. The problem is it keeps adding up to the storage and that's a big flaw for us. 

Best,

Farshid

JavaScript iOS

Thanks a lot Daniel! I'm in the process of converting my app to swift 4. Once that done, I'll be able to test Wikitude. 

Again, thanks and I will keep you posted