Seems to me that you are thinking in terms of fade from the camera viewpoint.
It's only the lights that fade out and since they are also at the far end of the
hall they still emit their light the same way as the nearest ones do.
Is that it?  I think I see what you are saying though, the light reaching the
camera from far off should be faded as well.  Guess again.  The light on the
objects are what you are seeing and not the actual lights.  This is a good
premise about how it works and I agree that the light should still be faded out
with distance from the camera to be more accurate.
Maybe go with black fog instead of manipulating the light source intensities.

Bob

"Eric Freeman" <eri### [at] ametronet> wrote in message
news:388f4495@news.povray.org...
| Hey all,
|
| I know what you're thinking: "Is this guy ever going to stop bothering us
| with his petty little problems?"  The answer is NO!!!  Be prepared to be
| tormented forever as I pick every nit I can find!!!
|
| But seriously...  the attached image shows a ceiling with a bunch of
| cylindrical cut-outs in it.  In every cut-out there are two light sources
| (one at each end).  I'm using lights with fade_distance, but the far end of
| the scene is as brightly lit as the near end (there is a fill-light
| positioned at the camera position which also uses fade_distance, making the
| nearest pillar slightly brighter than the others).  It seems as if light
| quits fading when it hits an object.  Is this the case?  Should this be the
| case??  Is this a bug???  I will re-render the scene making the more distant
| lights progressively dimmer, but thought I'd ask anyway.  For reference, the
| pillars are 8 units tall, 15 units apart, and there are 45 pairs of pillars
| (making the farthest pillar 660 units from the nearest one).  The lights are
| defined as:
|
| #while (Looper < NumPillars)
|   light_source {
|     <0,8.5,(Looper*PillarGap)+CylGap+0.2>
|     White*0.5
|     fade_distance 8
|     fade_power 3
|   }
|   light_source {
|     <0,8.5,(Looper*PillarGap)-CylGap-0.2>
|     White*LitePower
|     fade_distance 8
|     fade_power 3
|   }
|   #declare Looper = Looper+1;
| #end
|
| Eric
| ---------------
| "A wise and frugal government, which shall restrain men from injuring one
| another, which shall leave them otherwise free to regulate their own
| pursuits of industry and improvement, and shall not take from the mouth of
| labor the bread it has earned.  This is the sum of good government."
|      - Thomas Jefferson
|      - First inaugural address, 1801
| ---------------
| http://www.ametro.net/~ericfree
|
|
|
|

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