Michael Travers moved into animated features from live-action visual effects when he joined Blue Sky studios to become a managing technical director for the 2002 film Ice Age. Prior to that, he was a lead TD on Stuart Little and Godzilla at Sony Pictures Imageworks, where he also worked as a digital artist on Starship Troopers and Anaconda, and before that, a digital artist at Dream Quest Images. At Blue Sky, he was a CG supervisor for Robots and Ice Age: The Meltdown, and a production manager on Ice Age: Dawn of the Dinosaurs. For Epic, Travers was a co-producer. Epic tells the story of a teenage girl who finds herself shrunken into a miniature world filled with fantastical creatures a natural world seen from the eyes of a two-inch person. While there, she joins an elite band of leafmen warriors and a crew of comical characters determined to save this world and therefore, ours.
Here, Travers discusses Epic with CGW Contributing Editor Barbara Robertson. (Also read a Q&A with Chris Wedge in the May/June 2013 issue of CGW , and two others with CTO Carl Ludwig and Materials Supervisor Brian Hill online and accessible via the May/June 2013 issue box on cgw.com.)
Mandrake (Christoph Waltz) flies into battle to claim the forest he believes should have always been his. Photo: Blue Sky Studios.
In making this film, what was most challenging? We have some very complicated action sequences with a witches brew of everything going on. Dynamic cameras, large character counts, complex flight choreography, interaction with effects, in a dense forest environment all created a huge challenge to get it coordinated and looking right.
The look of the world was what we spent the most time on; the look of a world from the perspective of people who are very small. We studied macro-photography of flowers, fauna, and skin textures. When you look at the micro-details of the things around us in nature, its almost like science fiction. We had to reflect this in our environments. We also looked at stop-motion photography of plants growing, snails crawling, and so forth to create an overarching visual theme. Then, we broke it down piece by piece and implemented all these references in our production.
The film also takes place in a normal-sized world. Was it difficult to move from one to the other? When we transition from the human-scaled to the leafman-scaled world, we use a lens package thats slightly wider with a narrower depth of field to create a definite separation from the leafman perspective to the human perspective.
We also slowed everything down. The humans havent seen this world before. To a humans eye, the leafmen move so fast they can always stay hidden. So, from the perspective of characters in the small scale world, everything is slower and we use that to keep the audience oriented. Characters ride hummingbirds, but instead of 700 wing beats per minute, we knocked that speed way down. Our entire library of effects - splashes, smoke, water caustics, moving background vegetation, and so forth - were all slowed down maintain a consistent visual theme.
Keeping all that straight seems mind-boggling. A lot of smart people spent a great deal of time and effort defining the rules and look of the world. We had a plan per sequence of how everything would work at the leafman scale, the human world scale, and the transitions in between. After that, it was a matter of maintaining consistency.
Buffo (Pitbull) is a wheeler and dealer tough-guy toad who plays all the angles: he profits no matter which side wins or loses. Photo: Blue Sky Studios.
How did the small scale affect production? The artists who created textures at a normal scale had to add details when a small person is looking at the same thing. We had to change surface shaders and play with translucence and transmittance to get the right feel of light passing into them. Additional modeling details were added. We did a great deal of research to make sure we captured the essence of the leafman world. A typical example: Any time there is an object intersecting with a water surface, we had to create a meniscus to sell the effect. When you are two inches tall, the meniscus looks like a three-inch berm. Its huge.
Did the crew build separate assets for each world? We needed to build two libraries of assets for each of the two world scales. Wed build everything to work at human size, then rebuild or add assets for the leafman scale. To a two-inch-tall leafman, a 60-foot elm tree is as big as a skyscraper, so we had to add details to work for close-ups. Our materials artists relied heavily on nested procedural shader systems to reduce the number of large-resolution texture maps loaded in the renderer.
How many characters did the crew build and animate? In terms of unique character rigs, around 40. For background characters, we adjusted materials and textures to make variations. There are characters whose design is meant to invoke mystery, the Jinn, that blend into their environment. There are the bad guys, the Boggans, that are more amphibious and reptilian in nature. We also have a handful of unique forest creatures and many bird types. And, of course, our hero characters and the leafmen.
MK (Amanda Seyfried) encounters a slug named Mub (Aziz Ansari) src=images/media/2013-06/epic-rsf_130_210m_114.jpg width=600 height=254> MK (Amanda Seyfried) encounters a slug named Mub (Aziz Ansari), a self-described ladies man. Photo: Blue Sky Studios.
One of the big rigging challenges were Mub and Grub, a slug and a snail. They dont have joint structures that lend themselves easily to rigging. They dont have arms or legs. Their bodies can ride along any topology. Their eye stalks can retreat into their heads. On top of those challenges, they are comedic and expressive characters, so we had to put in wide range of face controls on top of an alrea
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Michael Travers moved into animated features from live-action visual effects when he joined Blue Sky studios to become a managing technical director for the 2002 film Ice Age. Prior to that, he was a lead TD on Stuart Little and Godzilla at Sony Pictures Imageworks, where he also worked as a digital artist on Starship Troopers and Anaconda, and before that, a digital artist at Dream Quest Images. At Blue Sky, he was a CG supervisor for Robots and Ice Age: The Meltdown, and a production manager on Ice Age: Dawn of the Dinosaurs. For Epic, Travers was a co-producer. Epic tells the story of a teenage girl who finds herself shrunken into a miniature world filled with fantastical creatures a natural world seen from the eyes of a two-inch person. While there, she joins an elite band of leafmen warriors and a crew of comical characters determined to save this world and therefore, ours. 
