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Camera-based Coordinate System Setup
The camera axis constraints can be used in small doses to set up the coordinate system, as we’ve seen in the prior sections. Typically you will want to use only 1 or 2 keys on the seed path; 3 or more keys will usually heavily constrain the path and require exact knowledge of the camera move timing.
Roughly, each keyed frame is equivalent in effect to a constrained tracker located at the same spot. You should keep that in mind as you plan your setup, to avoid under- or over-constraining the coordinate system.
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