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Subtleties and Pitfalls
The locks between two trackers are inherently bidirectional. If you lock A to B, do not lock B to A. Similarly, avoid loops, such as locking A to B, B to C, and C to A.
If you want to lock A, B, C, and D all to be on the same ground plane with the same height, say, it is enough to lock B, C, and D all to A.
When you choose coordinates, you should keep the scene near the origin. If your scene is 2000 units across, but it is located 100000 units from the origin, it will be inconvenient to work with, and runs the substantial risk of numeric inaccuracy. This can happen after importing scene coordinates based on GPS readings. You can use the Track/Shift Constraints tool to offset the scene back towards the origin.
Similarly, you should avoid scenes that are too small, for example where all the numbers are 0.00000123, 0.000001245, etc. These numbers will all be truncated to zeros by many other programs, destroying your scene.
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