Does anyone know what is the physical model
(lens shape, ray tracing, physical approximation, etc)
behind the apply_lens filter?
I tried to do "reverse ingineering" using the source code
but I am stuck on ray tracing inconsistancy...
I suspect a physical assumption on the form of the
image plane or an approximation has been used.

Thanks for the help.

Langis Gagnon
Computer Research Institute of Montreal

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