This project was made just for the fun of starting from a piece of stock footage and figuring out the end result. I found the original greenscreen footage which is just the one take of a man opening and then immediately closing his door. It got me wondering what's out there that would cause someone to immediately go back inside. So after keying the footage, I tracked in some random objects using Element 3D.
The first draft was just the shot with those objects tracked in but a friend suggested I build tension by having wide shots of the house and carnage. So I downloaded and retextured a house 3D model and put that in the middle of some wider shots. Below is a breakdown of the opening scene.