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Am 09.03.2011 22:57, schrieb Trevor G Quayle:
> "Trevor G Quayle"<Tin### [at] hotmail com> wrote:
>> I was doing some tooling about with the latest lighting challenge from 3DRender
>> (http://forums.cgsociety.org/showthread.php?f=185&t=955407) which features a
>> movie theatre. One of the maon aspects of lighting here will be that coming
>> from the screen. I first started using radiosity with an image projected on the
>> screen, however it was becoming apparent that it may take some really high
>> quality settings to get good results. I then though of using an array of area
>> lights created from the projector image. I had already done a lot of the
>> mathwork in my lightdome work, so I did some quick conversions to making a
>> planar version of it with some nice results.
>>
>> In the attached image, the first part is radiosity with some low quality
>> settings. The second is using the arealight array (16 area lights, 4x4 each).
>>
>> -tgq
>
> Next stage is the projector lighting. I think this is looking OK. I don't have
> the screen area light applied, just a single point light to add a little bit of
> additional illumination. This is the part where I was wondering about the light
> attenuation, realistically speaking, the brightness of the projector in the
> first 1/5 distance is a little too bright (~30%).
Of course you'll want fade_power 2. From my experience, fade_distance
should be roughly the light source size, so I'd try the equivalent of 35mm.
(I'm presuming assumed_gamma 1.0 here; for other gamma values, you'll
get nonsense results no matter what you do.)
I think the projector light is too bright in total, though of course it
all depends on how much dust you want in the air.
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