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Easier Sizing
If we know the inter-ocular distance (and we always should have a measurement for the beginning or end of the shot), then we know the coordinate system sizing immediately. There is no need for distance measurements from the set, and no problem with consistency between shots.
That makes coordinate system setup much simpler. On a stereo shot, when an inter-ocular distance is set up, the *3 coordinate system tool generates a somewhat different set of constraints, one that aligns the axes, but does not impose its own size, allowing the inter-ocular distance to have effect.
Keep in mind that the sizing is only as good as the measurement. If the measurement is 68 +/- 1 mm, that is over 1% uncertainty. If you have some other measurement that you expect to come out at 6000 mm and it comes out at 6055, you shouldn’t be at all surprised. Some scenes with little perspective will not vary much depending on inter-ocular distance, so the inter-ocular distance may size the scene accurately.
If you have a crucial sizing requirement, you should use a direct scene measurement, it will be more accurate. (In that case, switch to a Fixed inter-ocular distance, instead of Known.)
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