Go with the Flow

Zoic Studios turned on the switch for aquatic time travel in MGM and Paramount's recent Hot Tub Time Machine 2 .

Led by VFX Supervisor Rocco Passionino, who was on location for the shoot in New Orleans, Zoic crafted 225 VFX shots that encompass a wide array of visual effects to amplify the comedy, including futuristic matte paintings, high-tech graphical interfaces for a number of devices, and dynamic vortexes of light and water.

Passionino and the Zoic Vancouver office worked closely with Director Steve Pink to create the futuristic ideology for the film.

One of the most crucial effects for the sci-fi adventure was the water vortex that would serve as their mode of transit to the future from their magical hot tub. To intensify this time portal for the sequel, the Zoic team crafted a water vortex that becomes a sustained column of water and light. Passionino worked with Cinematographer Declan Quinn to create an animated LED light system to simulate the interactive light from the water vortex that would later be augmented in post.

The CG team utilized a wide array of tools and software to delve into the dynamics and water solutions involved with creating the water vortex. Once the main column of the of the vortex was created using Realflow, additional elements of foam, splashes, droplets, blobs, steam, mist and debris were created in Maya with Phoenix, Fury and V-Ray, then added in compositing to create the shaft of the vortex.

Additional render passes for subsurface, refraction, depth, luminosity and light rays were created along with an RGB lighting utility pass to give further flexibility for the compositors to light the CG in 2D. To connect the chaos on the ground to the sky, a swirling mass of volumetric clouds were created with Phoenix and rendered in V-Ray.

Another central effect for the comedy was the visualization of a character's existence being threatened due to the time travel.

To show Lou (Corddry) flickering - in threat of not surviving long enough to reach 2024 - clean plates were shot on set for each of the scenes where the effect would be needed and moments where the actors crossed. In postproduction, compositors painted sections back in that were needed and added multiple layers of static, distortion and chromatic aberration to the images to create the final effect.

LINK:	http://www.cgw.com/Press-Center/In-Focus/2015/Go-with-the-Flow.aspx...
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