Render layers to the rescue

For each shot we rendered two or three light setups using red, green and blue, to shuffle the RGB passes out later in compositing. This enabled us to animate the intensity for different colour groups in comp rather than having to spend lots of time rendering, or having to re-render shots. As light plays a big role in the short, we wanted enough time to try out different things in compositing. We did not know about this process before starting the project and we were able to do this because the film was made in black and white. Rendering always takes a lot of time; by having render layers we had to do fewer re-renders and in the end it saved us a lot of time.