> Alain <kua### [at] videotronca> wrote:
>> The easiest way, and fastest to render, is to use fading (fade_distance,
>> fade_power and fade_color) as Warp stated.
>>
>> This will not realy obscure what is behind the object, just tint it.
>>
>> You can also fill the object with some scattering media. It will
>> significantly increase the render time, but will allow you to have
>> non-uniform absorbtion. To enable an object to contain media, you need
>> to add "hollow" to that object.
>
>
> It sounds easy to use...
> I didn't use these features.
>
>

Easy to use, yes.

Be warned that if you scale an object using those features it's aspect 
WILL change as the distance a ray travel through the object will change.

For the media, it's the fine tuning that can be tricky.
The defaults for media are:
sampling method: 3 (adaptive sampling)
intervals: 1 (MUST be kept at that value, larger values hugely increase 
the rendering time)
samples: 10 (must be at least 3 for the adaptive feature to work)
samples use ONLY 1 value (the two values syntax is for sampling method 1 
and 2). If a second value is provided, it will be silently ignored.

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