Cubic Lens Distortion (or undistortion as well) is well known in compositing or any VFX package. Basic Lens Distortion would usually solve the distord plate a the center, but closer you would get to the border of the picture, more the distortion will still there. The Cubic parameter let you control that.
It could also be used to give a “Chromatic Aberration” effect
This shader is based on the Algorithm shared by ssonTech website. This algorithm is used in SynthEyes (matchmove software) and is pretty simple.
k = -1.0 ; kcube = 0.0
k = -1.0 ; kcube = 0.5
Chromatic Aberration example : k = -0.15 ; kcube = 0.15 || using red distord channel with green and blue undistord channel
I got the chance to have in my city one of the theater showing a sneak peak of Avatar by James Cameron (director of Titanic). First I must say, I really like the universe of Avatar, and I think it is really beautiful !
The show happens to be in Stereo 3d with polarized glasses. I’ve pretty much seen all the movies that came out since this new wave of 3d movies, and in my opinion the one which work the best was “Up” by Disney. After watching this Avatar 3d Sneak Peak, I’m a bit disappointed and would stick to my thought with “Up”.
Don’t give me wrong, James Cameron and his team did a great work on the stereo part, and some shots are really stunning, but in another hand I would say that most of the actions scenes I’ve seen so far are kind of messy and blurry .
What I liked in Disney “Up” was that the 3d was there only to give more depth to the picture, you could almost forget you had glasses on, or even that you are watching a 3d stereoscopic movie in a way that it was discreet and so comfortable for your eyes. They did master it without a doubt ! Some Avatar’s scenes are like that though, but on those 15 minutes, when it was about big action sequences, it looks like “hey check out the big 3D effect !!! wooowww you got a tree in your face !!”…. Come On !!! We got it now !
So to resume my thoughts, I don’t think Avatar will master the 3D Stereo quality of Disney’s Up, but still, it’s going to be beautiful and I can’t wait until December 18th for the movie to come out.