Matchbox to add lens distortion

Hi All

I found a matchbox the other day which seemed to be able to undistort and distort with only coordinates being entered. I can’t for the life of me remember what it’s called.

Does anyone else recall?

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What does F12 “lens” bring up? Jt lens?

Don’t think it’s that one - it’s similar but from memory it had x,y,z coordinates

Could be this one which has a simple lens distortion model with a/b/c parameters: Shader: Reframe

Or maybe one of the shaders that 3D Equalizer exports, like this? 3DEqualizer4 [featurette] - Release 6 beta 1: What's New - YouTube

Yes - it was reframe