Spline Interpolation

Instead of linear interpolation, spline interpolation can be used.

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Continuity control can be obtained.

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Fewer keyframes may be required for a given level of ``quality''.

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Control points for the splines may have to be computed based on interpolation constraints at the control points.

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Extra information may be required at keyframes, such as tangent vectors.

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Splines are more expensive to evaluate.

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Splines are more difficult to implement.