Swimming Pool from Jason Guinan on Vimeo.

This was something I did in my spare time to have fun with caustics in motion, and also play with the Special Effects tab with Architectural Materials in 3ds Max. By changing the Max Refraction Distance, you can easily change the falloff color as water gets deeper, and create a much more realistic render. Although, you would hardly see this with a swimming pool, but it was still fun to play with.