> For example, see the function at
> https://sourceforge.net/p/lensfun/code/ci/099f390d5d7f0df7ae2242f3bbc5973d29442950/tree/libs/lensfun/mod-coord.cpp#l883
>
> The "asin" returns a NaN if its argument is larger than 1, which
> means that both iocoord's also become NaN. You cannot recover it:
> For such pixels, there is no counterpart in the sensor image.
>
That's a good example. I don't know the value range of inv_dist but if the x/y
are bound to -1..1 the
radius sqrt(x^2+y^2) can easily reach values greater than 1 if
inv_dist>sqrt(0.5).
What is inv_dist meant to be? Inverse distance? How is it normalized?
Sebastian
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