> To clarify things, the default right vector is 1.33*x so this is what the
> docs should say too IMO.

If the default right vector is really 1.33*x and not 4/3*x then that is a
program bug (or design flaw, or whatever), since the aspect ratio of the
images it normally produces is *exactly* 4 to 3 and not 1.33 to 1.

Of course, I realize that 1.33 is an "approximation" to 4/3, but IMO it's a
pretty bad approximation, especially for large images. And in this case
there is no need to approximate at all (other than the internal floating
point rounding error, which is going to be much, much less than .01). So I
think that both the program and the docs should use 4/3.

Anders

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