Alain <ele### [at] netscapenet> wrote:

> Just tested a purely scattering media in a radiosity scene.
> Case 1:
> A very bright parallel cylinder light (color rgb 8000) parallel to and just
> above a plane.
> Scene filled with scattering media.
>
> Result: ABSOLUTELY no lighting of the plane as I expected.
>

That's a strange result.  The plane *should* be literally blasted with
light! I just ran a slightly different experiment, and the scattering media
is definitely creating radiosity lighting on the object  in my scene.

I'm using a media-filled sphere.. not atmospheric media... lit by a very
narrow-beam parallel cylinder light from below, with a white cylinder
object off to the side, outside of the media sphere, to pick up the
radiosity effect. (Media_on in the radiosity block, of course.) The "cone"
of light and the long cylinder object are parallel to each other, as in
your scene. Just to make absolutely sure that the parallel light isn't
somehow lighting my object, I enclose the light and the media sphere in a
light_group.  Rendering this, the cylinder shows a very nice radiosity
effect.

Perhaps there's something odd going on with atmospheric scattering media (?)

Ken W.

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