This was one of my first scenes created in the Unreal4 Engine. I found a way to rig up some car models with some C++ and then I was able to race both cars with an Xbox Controller. I was able to save out different performances of each race and then edit them together into one cohesive scene. The only keyframes in this scene came from animating the camera. The Unreal engine renders so quickly and allows you to iterate in real time. It definitely has one of the quickest workflows ever.