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> Stephen <mca### [at] aol com> wrote:
>> On 28/11/2017 18:11, Sven Littkowski wrote:
>>> I want to change the two suns into light-emitting media, can you assist?
>>> I simply lack expertise, never worked with media. Those will later
>>> replace the traditional light_source.
>>
>> Why don't you try yourself. You will never get the expertise if you get
>> others to build your scenes.
>> Help is a good thing but ask for it when you fail to get the results you
>> want.
>
> I'm thinking media won't be able to do what's wanted anyway. Sure, emitting
> media will illuminate surrounding objects, but cast shadows like a light on
> distant things? No, don't believe it can.
>
Emissive media CAN cast shadows.
For that to happen, you need to use radiosity with "media on" in the
radiosity block.
That way, the media can act like a fuzzy area_light whose brightness can
vary across it's visible surface.
radiosity{count 20000 media on}
default{radiosity{importance 75/20000}}
sphere{100*x 2 hollow pigment{rgbt 1}
interior{media{emission rgb<100, 50, 20>*25 samples 20}
radiosity{importance 1}}
Will use an average of 75 radiosity samples for most of the scene's
objects, but a very high count density for that relatively small and
bright object.
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