Christian Froeschlin <chr### [at] chrfrde> wrote:
> I think there is a fundamental problem with this approach,
> namely that POV-Ray does not trace from the light sources
> forward but from the eye backwards. So, terminating rays
> doesn't really have the effect of light oozing anywhere.

I don't think that should make any difference, because it would just mean that
rays tracing back from the camera would never make it to a given light source,
and thus that pixel would stay dark. Indeed, as you point out when discussing
light sources with a sharp cut-off fade_distance,

> it is
> however not physically correct because it does not take into
> account the time for the light to travel from the object to
> the camera.

....whereas chopping off rays over a certain length from the camera would do
exactly that.

> Furthermore, you may also need to take into account that
> your film material moves at relativistic speed :-P

I live in a Newtonian universe and plan to use a digital video camera. Which is
definitely not a contradiction.

Is there no way to give fog attenuation an offset, such that brightness fades
exponentially but only after a certain distance if you have a non-zero offset?
If not, how would I make a feature suggestion to that effect?!

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