While working on the event trailer for the Unified Bouldering Championships Pro Tour Stop #2 in Central Park, NYC, I figured out a split screen technique that I really liked. Its very basic and anybody who is remotely familiar with After Effects may scoff at my primitive efforts to make a tut but I am learning :) Its one thing to be able to pull this stuff off but another entirely to be able to teach others via recording a video and talking into your computer. As time goes on I’ll get better and start doing more advanced and magical tutorials. Even Andrew Kramer started off with the basics . . . :P I would love to get any feedback on this as it is my first one and I would love to know what I can do better. I already figured out A LOT just watching this back. I tried to include a lot of other workflow tips and share some thoughts as well. Check it out!
You can see the event trailer below and see examples of how we used this technique in action.
So what do you think?

Nice work. tad long.. I think the reason your rendered files were so big is because you duplicated the photo layer a number of times. You could have generated a stroke on your mask instead of duplicating your photo and generating a fill. Good tutorial though, def a cool effect. Promo is sweet, cool 3D city!
Thanks! I agree, I need to work on length. I thought this one was too long given the content as well. I’m gonna work on that! It seems like anytime I render out with alpha to preserve transparency it creates a large file. I didn’t even think about generating a stroke. In fact, I’d love it if you posted/linked a project file with that solution? :) Glad you like it and the promo! Thanks for watching! Check out the CityKit here: http://greyscalegorilla.com/citykit/