I used ptgiu and Nuke quite extensively for GIJoe a few years back and I
ended up just using the Card node and piping in the ptgui values. worked
perfectly.
In fact, for that very reason I was asking to keep the "old" distortion
model when the new lens distortion node arrived, so we could keep using
ptgui in that combination.
On 14/06/12 6:11 AM, Michael Garrett wrote:
You may want to give it a shot using a Card instead, since the three
lens distortion co-efficients correspond with the PTGui lens
distortion model. You would need to set it up with a camera and a
ScanlineRender, so it's more involved, but just make sure that before
applying the lens distortion, you have the card rendering through the
camera matching the straight image "pixel for pixel", as with this
setup Nuke is smart enough to not do a filter hit.
So in summary, match the camera's focal length and haperture in the
equivalent fields in the Card's projection tab (it can be any camera)
then go to the Lens Distortion tab and populate it with the PTGui data.
I got some interesting notes on this topic from an engineer at the
Foundry and I posted them on Nukepedia:
http://www.nukepedia.com/written-tutorials/the-lens-distortion-model-in-the-card-node-explained/
Cheers,
Michael
On 13 June 2012 10:20, Graham Houston
<[email protected]
<mailto:[email protected]>> wrote:
If I have distortion parameters from PTGui, (lens correction
parameters: abc, image shift: de), how do I translate that into
Nuke's LensDistortion node?
I see the 'Card Parameters' rollout, but the only values that
affect the image output are the 'Radial Distortion' fields.
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