Am 26.06.2015 um 16:52 schrieb Thomas de Groot:
> On 26-6-2015 14:55, clipka wrote:
>> Am 26.06.2015 um 09:53 schrieb Thomas de Groot:
>>> On 25-6-2015 20:00, And wrote:
>>>> Just like the opinion clipka have answered you the other day, an
>>>> emission sphere
>>>> in the sky is too small to render. I always use the parallel light to
>>>> simulate the sun light and it is very convenient. If you would like to
>>>> place a
>>>> white look-like object, the sun's color should like this:
>>>> rgb<1,1,1>*10000.
>>>> Is a very large quantity.
>>>>
>>>>
>>>
>>> Depending on the scene, the multiplicator used can be less than that. In
>>> my experiments shown in p.b.i I used a multiplicator of 2 which works
>>> quite well. Much higher values overexpose the scene.
>>
>> Maybe there's a misundertanding here:
>>
>> The multiplicator is needed on the looks_like object; the light_source
>> brightness should stay the same if you don't use fade_power.
>>
>
> True enough. THere was a misunderstanding though from my side (of
> course) as I had also added an emission to the looks_like object which
> it doesn't need in fact with And's suggestion.

Um... a looks_like object should _always_ have a emission! Otherwise it 
won't look like what a light source would look like.


However, And has correctly hinted someplace else at conflict between 
different ways of simulating the same thing when using a "looks_like" 
object. A light source should only show up in one of the two ways of 
each of the following pairs:

- Classic diffuse illumination vs. radiosity: A "looks_like" object 
should always have "no_radiosity on" set, which unfortunately isn't the 
default. (Theoretically, an alternative would be to make the light 
source invisible for the sake of the "diffuse" component, but in 
practice that doesn't make any sense due to the vast differences in 
computational effort; if you want to go that far, just leave out the 
light source entirely and go with the "looks_like" object alone.)

- Specular highlights vs. reflections: A "looks_like" object should have 
"no_reflection on" set. An alternative would be to make the light source 
invisible for the sake of specular highlights, but POV-Ray doesn't 
support this at the moment (which puts me to shame, as I must admit).

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