Offline Mode ​

In some cases it may be necessary to use the Viewer without network access. A typical usage is when the viewer is embed in a mobile app that will be used in situation where network availability is not guaranteed. For those cases it is possible to enable offline mode.

Offline mode can be configured on viewer creation using the api.offline configuration:

js
// Offline data are passed as a Blob
const blob = getOfflineData();

const viewer = makeBIMDataViewer({
  api: {
    // ...
    offline: {
      enabled: true,
      data: blob
    }
  },
  // ...
});

It is also possible to enable offline mode dynamically after the viewer was instanciated using the enableOfflineMode() method.

js
// Enable offline mode
await $viewer.api.enableOfflineMode(blob);

// Offline mode can also be disabled later
$viewer.api.disableOfflineMode();

How it works ​

For the viewer to work in offline mode you need to provide an "offline package" which is a zip archive that contains data prefetched from BIMData API and needed by the viewer to work properly.

To generate an offline package you have to use the /offline-package route on our archive backend (https://archive.bimdata.io/).

An archive is generated for a given set of models that must be specified as query parameters.

Here is an example using curl to create an archive for models 123 and 456 that are in project 2 of space 1:

bash
curl "https://archive.bimdata.io/cloud/1/project/2/offline-package?modelId=123&modelId=456" \
  -H "Authorization: Bearer <access_token>" \
  -o my-offline-package.zip

Once generated you need to make the archive accessible to your application and load it as a Blob using javascript before pasing it to the viewer. The way the archive is made accessible and loaded depends on your environment and is up to you.

Android example ​

In the context of an Android app using WebViews it is possible to package your archive with your application and use a WebViewAssetLoader to load the archive using an URL of the form https://appassets.androidplatform.net/*.

You can have a look at our android-example repository to get a demo project showing how to integrate the viewer into an android application and use it in oflline mode.