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Capturing a Wookiee
July 28, 2004
How do you go about capturing a Wookiee, let alone hundreds upon hundreds of the shaggy giants?
The Wookiees in Revenge of the Sith will be realized through a combination of practical costumes and digital extras. Eight massive furry costumes, crafted by the Creatures Department under the leadership of Creative Supervisor Dave Elsey, formed the central core of live-action Wookiee performance. Most of these Wooks were shot in Sydney earlier this year.
Kashyyyk, however, has more than just a small crowd of the furry titans. The lagoon-side tree cities of the arboreal world are teaming with Wookiees, warriors and civilians both, and for some of the most crowded battle scenes, the animators at ILM will have to fill in the frame with digital Wookiee extras.
There are two principal methods of infusing life and performance into a digital character. One is key-frame animation, where an animator sets the main poses of the character, and the computer fills in the gaps of motion in between these stances. The other is by applying motion capture data performed by a live actor to a digital model.
The motion capture stage became a workout room for Michael Kingma, the 6'11" Australian basketball player recruited for the role of Tarfful. In that role, Kingma's height is increased to over 7', and he disappears under the heavy fur and muscle suit.
Today, though, Kingma isn't playing Tarfful. "He's playing every digital Wookiee," says Doug Griffin of ILM's Motion Capture Department. Griffin directs Kingma, often acting out the required actions himself first before letting him take over.
Pulling up animatics footage of the lagoon battle on Doug's computer screen shows hundreds of Wookiees running out from out of cover, striking out against Corporate Alliance and Trade Federation droids. The treaded tanks, cut from Episode II, have undergone somewhat of a conceptual redesign, judging by the animatics. Whereas before they were droids themselves, these models appear to have droid pilots or at least battle droid gunners aboard.
"Will I be paid for each one?" asks Kingma with a smile, examining the actions of the furred swarm that his performance will drive.
The small stage is surrounded by an array of 16 cameras in perfectly calibrated positions. I get the standard warning as I enter on stage -- try not to touch the camera stands, but if I do, be sure to let the crew know.
Each camera has a ring of LEDs projecting forward along its view. Kingma wears a tight spandex suit covered with little reflective balls. Just snapping a few pictures with my still camera illustrates just how well they throw back light - my camera flash is reflected back with full intensity in that split-second.
The sixteen digital cameras each capture a grayscale feed at 120 frames per second. That grayscale image data is further crunched down into black and white, with a very high contrast. Anything that is not a reflective ball becomes a featureless sea of black, leaving just a cloud of reflective spheres floating in the air.
The mental exercise of connecting-the-dots helps me visualize the humanoid form driving the motion of these floating dots. From just two of these 16 camera feeds, the computer can determine where in 3-D space those dots exist and move. Thus the computer can connect-the-dots, creating a crude 3-D wireframe humanoid, and determine what exactly Kingma is doing with his body.
Shots go really quickly. There's no set-up time and all 16 cameras gather what is needed. Lighting doesn't matter. Framing doesn't matter. With the data pulled from the reflective balls, these Wookiees can be put into any camera angle. At 120 frames per second, there's enough performance to be extracted from a single second to slow down or speed up for different effect.
Reference and inspiration material lies nearby. A laptop plays footage from A New Hope. How fast does a Wookiee run? Consulting Chewbacca loping through the Death Star reveals a pretty relaxed trot - it's the massive leg-spans that move a Wookiee at a brisk pace. Doug often mentions Saving Private Ryan and Braveheart as reference, to help Michael further visualize what's required of him.
It's not all epic battles. In some cases, Kingma's nameless Wookiee extras are guiding in helicopter traffic, loading supplies on landing platforms, or barking orders to clones and Wookiees. In other cases, it's Wookiees leading troops into the fray, jumping out from behind cover and charging forward, or recoiling from a near miss of heavy ordnance.
A variety of practical Wookiee props lies nearby -- the oversized blasters, bowcasters and rifles crafted by Ty Tieger's Prop Department. These too have reflective markers on them on key points, allowing animators to correctly align these handheld props in their digital incarnations.
Michael really gets into the performance, even roaring loudly to properly portray how such outbursts can affect posture and movement. By the end of a solid morning of work, he can feel it in his voice, and looks quite relieved when the rest of the shoot requires "no more grunts."
It's may be easier than running around with a full Wookiee outfit on, but it's still a tough job.
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The General Awaits
July 02, 2004
As revealed this week in Rob Coleman's Hyperspace chat, the evil General Grievous has yet to make an appearance in a finished Episode III shot. That's not to say the computer-generated character isn't getting a workout. Already, animation of Grievous and Obi-Wan Kenobi engaged in a bare-knuckle brawl (if something with metallic fingers can be said to be bare-knuckled) is being developed and approved.
"The General is still getting clothed," describes Rick McCallum of Grievous' absence from weekly finals. Though the extremely complicated CG model of him is finished and approved, his final painted form has yet to be rendered. The image of him that graces the cover of the latest official UK Star Wars fan magazine and the soon-to-be published official French magazine, which can be found in the current issue of Cinefex isn't a finished form. The long lead times of print publications required that image of Grievous to be completed over a month ago, and Grievous has continued to evolve since then. That image is actually a combination of an unfinished render with 2-D digital paint applied by Concept Artist Alex Jaeger.
"There's still work left to do on him before we can add him to shots," says McCallum. "It's not until we have a voice for him and can record a guide track for him next month that we can really start animating his character."
The new Visual Effects Supervisor Roger Guyett is still overseas, gathering exotic plate photography. He reports that he'll stay an additional weekend, as a rash of thunderstorms have prevented him from getting the necessary Kashyyyk background plates.
On Thursday, June 24th the much-reported-on epic opening shot -- OSB10 -- was shown to George Lucas for approval. Even though I've tracked the progress of this shot from the earliest animatic to the finished ILM form, there's nothing quite like seeing it projected on the big screen.
"I'm getting dizzy," commented George, as the starfighters twist between a pair of massive capital ships. Granted, I haven't been to all the approvals meetings, but I'll wager this is the first one where the audience reacted with applause.
OSB010 now joins dozens of other OSB shots already approved as the opening sequence of the movie shapes up. For fans of variable-geometry robots, there's some good news. The Trade Federation vulture droids will be seen to turn, fold and transform on screen - a functionality incorporated into their design years ago for Episode I, but something we have yet to see on the big screen.
Tado, a young Jedi Padawan, is outnumbered. He twirls his lightsaber against a swarm of opponents. In the animatic of this sequence, the Jedi youth performs a twisting leap, flipping in the air to avoid an incoming attack.
"I was wondering how we were going to do this," says George Lucas, as the scene is turned over to ILM to begin their work. He is closely acquainted with the acrobatic capabilities of the performer - this young Jedi is played by his son, Jett.
Rob Coleman confirms that ILM has already started constructing a digital model of Tado, but George offers an alternative.
"Jett knows how to do this with wire-work," says George, "in case we'll be doing any wire-work during re-shoots."
Since Tado is relatively small in frame for the one shot with the Force-assisted leap, the shot is a perfect candidate for a digital double. Stunts such as these aren't the only time CG versions of characters are employed -- in one shot turned over today of Anakin leading a phalanx of clone troopers, the Chosen One will be likely be CG.
Why? For one thing, he's less than ten percent of the screen's height. In the past, the gathering of one shot like this would likely never require the actual actor. An extra dressed in Jedi robes shot from 200 yards away would fill the role. Or he'd be filmed and shrunk down into frame to look appropriately small. Now, the distant digital double saves the set-up time required for such a small piece.