Nice.  Thanks for the image.  I'll take a close look at it, and run some
experiments too.

"Kitsune_e" <kit### [at] hotmailcom> wrote in message
news:3eb1ce4e@news.povray.org...
>
> Sun Tzu <sun### [at] nospamhotmailcom> wrote in message
> news:3eb11c63$1@news.povray.org...
> > Thank you for the suggestion.  I will try using media, although I must
> > confess I'm rather confused about the difference between the media
> > absorption parameters as opposed to the fade_power, fade_distance,
> > fade_color specifications.  Isn't the fade_... stuff supposed to do the
> same
> > thing as the media absorption stuff?   If not, what is the difference
and
> > when should I use one instead of the other?
> >
>
> Okay, I'll admit that I didn't know either just off the top of my head.
So
> I went and made this, after re-reading the documentation of course.
>
> Okay, furthest to the left is media absorption,  The media absorbs green
> blue and some red light (<.5,1,1>) and so the shadow is white minus half
the
> red, and all the rest (<.5,0,0>).
>
> in the middle is fade.  In the fade there is no media, the fade_distance
is
> .5 (the radius of the sphere is 1), the fade_power is 1.5 (docs said use a
> number between 1 and 2 so...), fade_color is <1,0,0> so all red (I tried
> <0,1,1> but this blocked all red light...).
>
> The sphere on the right is just a red sphere with filter and transmit of
.75
> and caustics on.
>
> So!  Absorption absorbs light, and fade blocks light.  I think you could
> achive similar effects using either... except that absorbing media can be
> applied at with a density map, so where media is thickest it will absob
the
> most light.
>
>
>

Post a reply to this message