BRG XCard 2015

share on google plus share on facebook share on twitter share on linkedin share via email

For our holiday card this year, we explored bringing 3D reciprocal diagrams into virtual reality! On the front of our holiday card, are planar projections of 3D reciprocal snowflakes. Using the “BRG XCard 2015” app, you will be able to see the holographic projections of the 3D reciprocal snowflakes in real-time! If you understand the frame-like snowflake as the structure (under given external loads, or equivalent self-stress), the forces within the bars of that structure are proportional to the areas of the corresponding, perpendicular faces of the solidlike snowflake.



  1. Download the image below (“Front of the Card”), and open the image on a device of your choice. Or, you can print it as well for even more interactivity.
  2. On another device, download and install the “BRG XCard 2015” app from the Google Play or Apple app store. (Apple app still pending…)
  3. Open the App.
  4. Point the camera at the front of the image. Be sure to include the whole image in the viewing area.
  5. Wait until the image is tracked.
  6. Enjoy!

Front of the Card:


Back of the card:


Demo of the card using an iPad:



Snowflake in self-stress state (red members in tension)



Leave a response

XHTML: You can use these tags: <a href="" title=""> <abbr title=""> <acronym title=""> <b> <blockquote cite=""> <cite> <code> <del datetime=""> <em> <i> <q cite=""> <s> <strike> <strong>