It's always struck me as strange that this is the way that raytracing has to
work, ie start from the film or screen and work backwards. What's missing below
is that the ray has to continue until it hits a light source or goes off into
infinity (in which case it won't appear).

Matt Giwer (almost) wrote:

>         I think ...
>
>         Take a point on the film, shoot it through the pinhole, see what it
> hits, calculate what is where it hits and what affects what it hits then
> what it passes through on the way back if applicable.
>

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