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There’s a bit of new terminology to define here, since there are both 2-D and 3-D curves being considered.
Curve. This refers to a spline-like 2-D curve. It will always live on one particular shot’s images, and is animated with a different location on each frame.
Flex. A spline-like 3-D curve. A flex resides in 3-D, though it may be attached to a moving object. One or more curves will be attached to the flex; those curves will be analyzed to determine the 3-D shape of the flex.
Rough-in. Placing control-point keys periodically and approximately.
Tuning a curve. Adjusting a curve so it matches edges exactly.
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