This river was created by Andrea Mazarrota López in Houdini, combining FLIP and whitewater simulations, animated bird crowds, vegetation powered by Vellum, and drifting smoke to enhance the atmosphere. The final shot was rendered using Karma CPU and composited in Nuke.
We’ve got plenty of stunning Houdini water simulations on 80 Level, check out these works by Vishnu S, Ahmed Yousef, and Yuki Ito: