There is no precise reason. The director is free to consider that the right view is the main view, perhaps because he thinks that it is better. Normally, in the human vision, the two eyes are equal, and the "perfect 2D view" is the view generated by the brain and corresponding to a "third eye" located exactly between the two eyes. But in the movie, it is too difficult (and expensive) to shot 3 views at the same time, and the director has to select a view for the 2D version of the movie.
The real question is not why is it the right view in some rare cases, but why is it not the right view more often? There is no objective reason to consider that the left view is better than the right one.
In the 3DBDs, the main view must be encoded in AVC, and the dependent view in MVC, because the 2D-only BD players cannot decode MVC. They "see" only the AVC stream, and show it exactly like a 2D BD.
Last edited by r0lZ; 27th May 2015 at 11:54.
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