So, forgetting about the newer LensDistortion coefficients which are two values, it seems that the three pts lens correction values are closely related to the old Card lens distortion method - they both output a cubic, sqaured and linear coefficient value - but if I plug the squared value (also the "b" value) from the pts into the Nuke card "b" value (squared) it doesn't match up :/
I'm sure DD would have done this a lot back in the day though, with pan and tile setups. On 13 December 2011 11:03, Michael Garrett <michaeld...@gmail.com> wrote: > I'm sure this problem's been around for a very long time in various forms, > but does anyone know the magic combo to get an exact correspondence between > the lens correction coefficients in a pts (panotools/ptstitcher) script > file and Nuke's new-ish lens distortion node? We are auto generating a pan > and tile dome of nuke cards from the pts. > > Without really delving into the maths involved, I have done a bit of > background reading on the lens correction model and the pts script file > format: > > http://wiki.panotools.org/Lens_correction_model > http://wiki.panotools.org/PTStitcher > http://www.panotools.org/dersch/barrel/barrel.html > > The lens correction coefficients are represented by the o-line options (a > b and c values) in the script and it seems that in all the pts scripts > generated, the b value is the only one which is relevant - the others are > at 0. But the last URL I pasted suggests that "in most cases" the b > parameter is all that's needed to get "satisfactory results". > > What we are currently doing is plugging the b value into the "radial > Distortion 2" knob which is close but looks like it could be a bit > tighter. We've also tried putting it into the b value of the lens > distortion knobs directly on the card but that looks worse. > > Thanks for any insight! > > Michael > > > > > > >
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