A simple method to achieve smooth camera movement.

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Start by nesting several Nulls, each at it's parents center 0,0,0.

The camera goes at the bottom of the hierarchy.

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Block out the general movement by creating the over all path from distinct maneuvers,
working from the top down in the hierarchy.

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Once you have the movement roughly blocked out, simply overlap the sequences, and set a simple "S" curve for each time curve.

Smooth....

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This top view clearly shows when each track ends.

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HTH

JeremyW