Creating Breath
Some of Titanic's most delicate effects were created by visual effects and digital animation powerhouse Blue Sky|VIFX, a division of Twentieth Century Fox. Blue Sky|VIFX was charged with three basic types of shots for Titanic: those depicting the ship's immense engine room, star fields, and puffs of human breath which were critical in conveying the cold temperatures on the night of the ship's sinking. Despite their realistic subtlety, Titanic's breath sequences posed many technical challenges. Among them were the sheer number of puffs of breath that needed to be created and integrated into a staggering number of shots, all with a consistent quality that maintained the integrity of a given sequence while conforming to an over-all whole: the movie itself.

Actors spent much of the filming time wet and probably chilly, but simulated cold breaths still had to be added to the final footage. © 1997 Paramount Pictures All rights reserved.

Filmed near the relatively warm waters of the Pacific, many of Titanic's shots lacked the frosty breaths that were surely present when the liner went down in the ice-chilled waters of the North Atlantic in 1912. The challenge was to add these breaths using 2D compositing, yet still have them appear "3D". To accomplish this a variety of digital technical teams were assembled, among them a group of digital rotoscope artists.

The first task at hand was to acquire breath elements. These were shot using "breath actors". These breaths were then scanned by computer and assembled into a breath library. With the actual film shots in hand, the work of marrying the two into one could begin. To create the effect or illusion of 3D each shot had to be individually evaluated for placement. Would the breath, for example, come out of a person's mouth, but be in front of one person yet in back of another? Complicating things further was the fact that as a given person's head turned, the breath's 3D placement would also need to change. Critical as well, was the selection of the correct breath. Was it affected by wind, as in the shots of the sailors in the Titanic's crow's nest? Additionally, James Cameron wanted "breaths that act." In other words, breaths that would accentuate the dialogue or action. This meant extra special attention was required to fulfill this unique vision. It was such unparalleled attention to detail that would become Titanic's hallmark. With the shot evaluated and the breath(s) selected, the meticulous job of digital rotoscoping could begin.

The Process
If, for example, the given breath needed to go in front of someone or something, that was relatively easy because the breath could simply be "slapped" over the given area. Usually, though, that same breath would have to also fall behind, say, someone's moving shoulder. The compositor, or the digital rotoscope artist, would have to create an animated matte that exactly followed the movement of this shoulder, covering it to its precise edge. If the head turned then perhaps still more mattes would have to be created. Each matte, a tracing of the image element it was protecting, would then be rotoscoped to move exactly as did that image element, i.e. the shoulder. To accomplish this type of roto matte a digital artist typically sets up a series of key frames, much as a traditional animator does. The computer can then, by calculation, interpolate the necessary inbetweens. Unfortunately, this interpolation was not always completely "on." This would require a digital artist to go manually through and key every frame. Not precisely locking down an animated or rotoscoped matte could lead to a jittery element or effect, such as a breath, that would appear incorrectly placed among the shot's digital layers.

In Titanic, some of the most challenging rotoed scenes were the close-ups of Jack and Rose, where even a slight roto error would easily become evident. This was also true of some of the deck scenes, where many rotoed mattes had to move not only correctly, but allow for placement of both breaths as well as a night sky filled with stars. Once fully rotoed, breaths placed, and mattes removed, compositors could then proceed to adjust any number of parameters including breath speed, density/opacity, as well as any necessary color-corrections.

Perhaps this epic effects-laden movie's greatest effects legacy is not all the compositing, or rotoscoping, or 3-D modeling, etc. that was done. It is not the effects themselves that are what's important. What is most important is the story. Effects are there to serve story. More than any other movie before it, Titanic illustrates this best. Yes, one can have incredibly stunning, hauntingly beautiful, or even explosive visual effects, but if one doesn't serve the story with these effects, use them to bring the story to life without overpowering it, then all one has is effects. When the effects stand behind the story and serve it, then one has a film that stands as a milestone in the effects industry.

Venture back to the November 1996 issue of Animation World Magazine to read an interview with James Cameron about his work on the Terminator 2-3D stereoscopic 3-D ride for Universal Studios.

Marian Rudnyk is a former NASA astronomer and planetary photogeologist who worked at the Jet Propulsion Laboratory in Pasadena, California. He was part of NASA's PCAS (Planet Crossing Asteroid Survey) Program where he was an asteroid hunter. He also participated as a member of NASA's Achievement Award winning multi-mission imaging team on the Voyager at Neptune mission, as well Magellan at Venus and many others. Making a transition into the animation industry, he began as a traditional animator freelancing on such projects as a Levis commercial for Acme Filmworks. He currently works as a digital artist, science consultant and freelance writer. He has written for the World Book Encyclopedia and David Wallechinski's People's Almanac of the 20th Century. His current film credits include Titanic, Home Alone 3, and Armageddon.