Whoa, this is just what I was requesting a short while ago, but then gave up that project...
Would love to get some time to play around with this, looks like it can do pretty much everything =).
"Note that "-" is used instead of "+" because we are mapping from output to input pixels, not the other way around (which would be more intuitive)."
I'm guessing it's like this so that each output pixel will have an input location (interpolated pixel) to get its data from.
"t: t=n/framecount (so 0<=0<1)"
0<=t<1
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