![]() Mass does not change with a body’s position or movement. The mass is a fundamental property of amount of matter in the object. Weight is the gravitational force acting on a body’s mass. Mass is a measure of the amount of material in an object. Where F = force (N), m = mass (kg), a = acceleration (m/s2). The fundamental relation between the mass and the weight is defined by Newton’s 2nd Law as: Mass and weight are two common often misunderstood terms. In one sequence Merida flicks her hair from one side of her face to the other, but even such high level gross spatial changes were able to be automatically accommodated. This means that a cluster of hairs would all be dealt with as one group, and the Hair simulation could be multi-threaded. The new code does computation before it sends hair off to the simulator to determine how other hairs would relate. Pixar developed and internally released a new simulator, which is multi-threaded. This coupled with the problem of collision and intersection – while holding to the production schedule – made Brave’s hair simulation extremely complex. If the ‘springs’ were too soft the hair would unwind, if the hair springs were too stiff, her hair would not move realistically. Hair is modeled using a series of mass and springs (springs connecting point masses). But very curly hair acts in a contradictory way: curls are very stiff, so the springs need to be quite rigid, but the movement of the hair requires a soft flowing quality that fights this property. Simulation team was headed by Claudia Chung (R) The curls themselves were an issue from a simulation point of view.Merida’s hair required much greater hair to hair (soft body) collisions than anything Pixar had done before. ![]() The previous hair system used by Pixar had to be seriously overhauled since: ![]() Earlier hair such as for the characters in The Incredibles had much more groomed hair, but here the character’s hair simulation needed to solve how to get this messy, tempestuous and unpredictable look while still looking attractive and flowing nicely with the animation. The Princess Merida’s hair was almost a three year process to get correct. If her curls were unwound Merida’s hair would measure 4 feet long.
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