[ptx] hmmm... are there any in-depth explanations of the hugin optimizations?

[Rob Park]

So I'm working on updating my tutorial... I went out and took a quick
panorama of a local park... but I'd been having a hell of a time
getting it to stitch right...

I couldn't figure out what the problem was. There were horrible stitch
lines, buildings split in half, etc. My first instinct was that
autopano was generating bad control points but I looked them over
meticulously and they all seemed to be exactly correct in the
images... then I played with different optimisations, and the images
just would not line up at all... until I did the "optimise for barrell
distortion", suddenly everything is lining up nicely. I've never used
this one optimization before, I'm not sure what barell distortion is
(though this is the second panorama I've made with my new camera, so
perhaps this camera has more barell distortion than my last one did?).

So is there an in-depth explanation of the various hugin optimisations
available? At the very least I'd like to understand them more, and I'd
like to link to it from my tutorial when it's done.

Thanks ;)

-- 
Urban Artography
http://artography.ath.cx