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Hi to all.
A few dumb questions about area lights.
An area light is a single light source. It's made of several
sub-sources, but you can't make it "look_like" an array of bulbs, right
? I mean, you can't automatically correlate the number of sources in the
area light and the look_like statement ?
If you want to replace an area_light (say 4x4 with color <1,1,1>) is it
equivalent to set a 4x4 array of individual point lights with color
<1,1,1>/16 ?
I have many more about radiosity and photons, but I'll wait for those ;-)
Thanks for your help.
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"regdo" <reg### [at] wanadoo fr> wrote in message
news:41f755ef$1@news.povray.org...
>
> If you want to replace an area_light (say 4x4 with color <1,1,1>) is it
> equivalent to set a 4x4 array of individual point lights with color
> <1,1,1>/16 ?
IIRC, the answer is 'no'. An area light is not just a shortcut for a grid of
point lights. It has some limitations and some advantages (mostly speed and
softness of shadows iirc) over a grid of point lights.
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> IIRC, the answer is 'no'. An area light is not just a shortcut for a grid
of
> point lights. It has some limitations and some advantages (mostly speed
and
> softness of shadows iirc) over a grid of point lights.
It's advantages are that soft-shadows can be calculated faster than using a
real array of point-lights when using the adaptive technique with
high-quality (large array) shadows. This depends on the complexity of the
scene/objects/materials, but generally, an area_light will be better.
It's disadvantage is that the lighting is still a point-light, so there'll
be no soft specular highlights, or even rectangular ones (depending on how
you set up the array). Area_lights only affect the shadows, not the lighting
itself (unless partly in shadow, but still, the specular terms etc are just
calculated based on a point, not an area).
--
"Tim Nikias v2.0"
Homepage: <http://www.nolights.de>
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Btw, some facts about area_lights can be found at:
http://tag.povray.org/povQandT/misconceptions.html#arealightconfusion2
--
#macro M(A,N,D,L)plane{-z,-9pigment{mandel L*9translate N color_map{[0rgb x]
[1rgb 9]}scale<D,D*3D>*1e3}rotate y*A*8}#end M(-3<1.206434.28623>70,7)M(
-1<.7438.1795>1,20)M(1<.77595.13699>30,20)M(3<.75923.07145>80,99)// - Warp -
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regdo nous apporta ses lumieres en ce 2005-01-26 03:33:
> Hi to all.
> A few dumb questions about area lights.
> An area light is a single light source. It's made of several
> sub-sources, but you can't make it "look_like" an array of bulbs, right
> ? I mean, you can't automatically correlate the number of sources in the
> area light and the look_like statement ?
>
> If you want to replace an area_light (say 4x4 with color <1,1,1>) is it
> equivalent to set a 4x4 array of individual point lights with color
> <1,1,1>/16 ?
>
> I have many more about radiosity and photons, but I'll wait for those ;-)
> Thanks for your help.
You can use a look_like to make an area_light "apears" like an aray. Have the
look_like use an
object that is an aray of small spheres. It don't have to have the same number of
components or
actual size as the area_light. The look_like have NO effect on the behaviour of the
light it is
added to.
Alain
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