Am 25.01.2016 um 22:56 schrieb Mike Horvath:
> On 1/25/2016 4:48 PM, clipka wrote:
>> Am 25.01.2016 um 22:46 schrieb Mike Horvath:
>>> On 1/25/2016 4:37 PM, clipka wrote:
>>>> Think of it this way: If you reduce the density of a gas, you reduce
>>>> the
>>>> probability that any given light ray hits a gas molecule and is
>>>> diverted
>>>> from its original direction to a new one: Light en route to the camera
>>>> from the background has less chance of being diverted /away/ from the
>>>> camera, while light en route to anywhere in the scene from a light
>>>> source has less chance of being diverted /towards/ the camera.
>>>
>>> I still don't understand why lowering the density of the gas darkens the
>>> scene more than not having any media at all.
>>
>> Are you absolutely sure it does, and you're not seeing the effect from
>> any other difference?
> 
> I've attached two renders. One is with no media at all. The other is
> with the media, but the scattering color set to rgb 0.

This is seriously odd, entirely unexpected, and to my present knowledge
as a developer only explicable by a bug.

As I cannot reproduce the behaviour here with a simple scene, I would
kindly ask you to post some minimalistic version of your scene as an
attachment in povray.binary.scene-files so I can have a closer look at it.

Also, please let me know exactly which version of POV-Ray you are using.

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