Hi all!

Prompted by the recent bug fix in enfuse (small artifacts...) I
upgraded to recent versions and also got the latest documentation.
While browsing the documentation I noticed the part about enblend's
wrap modes. Previously I had simply passed -w and thought it would
handle all wrapping. Wrong. It only does horizontal wrapping (which is
most important for full sphericals). But I noticed there are more
modes, among them a vertical mode, about which the documentation
writes:

‘vertical’
Wrap around vertically:
SP (x; y) = fP(x; y + nh) for n in Z
This is useful for 360 degree vertical panoramas as it eliminates the
top
and bottom borders.

If enblend actually follows this formula, then it's wrong: y + nh
would jump straight from the north to the south pole, where blending
is definitely not wanted. The correct formula is a bit more involved;
to turn a full spherical into a continuous tiling of the plane, every
other horizontal strip has to be flipped vertically and offset by w/2.
So now I wonder, is the documentation wrong, or the program, or both?

Kay

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