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The visual path of action from one extreme to another is always described by an
arc. In nature, arcs are the most economical routes by which a form can
move from one position to another.
Such arcs are used extensively in animation, since they create motion that is
more expressive and less stiff than action along a straight path.
Relevance in CGI
In Computer Animation, motion is usually represented in a timeline view
using splines(arcs). The arcs represent the values of an objects parameters at a specific moment in time.
The method used for calculating interpolated keyframe values
determines the characteristic of the arc(motion).
A linear interpolation creates motion that is rather dull and
stiff. While a spline interpolation creates motion that is more expressive.
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