The visual effects were mostly created in After Effects using Particular for the smoke and Element 3d to composite the 3d elements. The tree in the wide shot with the zombies was made by Devin Koehler in zbrush. I did have a problem with the obj file that was exported from zbrush. None of the detail from the tree was showing up in After Effects. So I imported the tree into 3ds Max then re-exported it as an obj and it fixed the problem.
Here are a few stills from the shoot. William took care of rounding up all the extras. We had a great turn out. This was the very first shoot I've ever been on where more people showed up than expected. It was so awesome. Everyone was so enthusiastic and we all had a blast!