While Tangled: Before Ever After has pretty good animation for its production, Frozen 2 has more time and money put behind it. As such, the animation in Frozen 2 is far more elaborate. Tangled: Before Ever After is forty minutes shorter, two-dimensional, and serves as an introduction to a bigger narrative that just started its third season. Frozen 2 is a theatrical production with a ton of money put behind it.
He expects his solutions to appear in another animated feature next year.There are a few big things to consider when comparing the two films. Now Grinspun has moved on to a new challenge-developing a program that accurately predicts the movement of hair, which collides in even more complex ways than clothing. They accepted the need for a collision-stopping fail-safe, but theirs allows the layers of fabric to slide against one another, and it accounts for friction, which affects the speed with which the fabric moves. After months, Grinspun and Tamstorf’s team came up with a solution. Previous fail-safes continued to move the fabric forward in space but did not allow the layers of material to move relative to one another, creating a rigid, shell-like appearance. When an animation program becomes overwhelmed with data, it resorts to a “fail-safe,” a backup program that prevents the layers of fabric from creating new collisions. With multilayered clothing, a computer must account for potentially thousands of collisions at once.
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Then he translated that equation into simple computer code that could be used to predict the movement of any “flexy, bendy material,” including rubber, fabric, even sheets of metal.īut depicting the movement of Rapunzel’s fancy gown posed a larger challenge. These included friction, the hat’s “bendiness” (elasticity) and the momentum with which it hit the ground. He studied the film for hours in slow motion and found the simplest equation that expressed the interaction of variables affecting the hat’s bounce. Eitan Grinspun of Columbia University’s school of engineering had become fascinated with this area of research in 2002, when he filmed a cowboy hat hitting and bouncing off the floor. They got in touch with a computer scientist who has made a specialty of studying how materials respond to collisions. Rather than scaling back his sartorial ambitions or deploying armies of animators to illustrate complicated scenes by hand-solutions traditionally employed by ambitious animators to get around the challenge-Tamstorf and his team decided it was time to find a new way to solve the problem. “But when a character wearing free-flowing, multiple layers of clothing moves, it can create a lot of contact between the different layers, especially in the way they slide on top of one another. “From very early on, we knew we wanted to get more elaborate clothing than had been done so far in ,” says Rasmus Tamstorf, a senior research scientist at Walt Disney Animation Studios Research. The filmmakers had run up against a challenge that has long plagued sartorially inclined animators. When the animators at Walt Disney Studios first dressed up Rapunzel, the long-haired star of the forthcoming movie Tangled, and had her spin around in front of a mirror, she froze mid-turn, and the folds in her multilayered purple dress turned stiff as shells.
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