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I think that the section "6.10.3 Photons and Light Sources" is a bit
confusing because first there's one version of the photons-block inside
a light source and then another.
It could be better if the first example was changed to:
light_source {
MyLight
[light_photon_block]
}
Also the 'area_light' switch should be explained.
--
#macro N(D,I)#if(I<6)cylinder{M()#local D[I]=div(D[I],104);M().5,2pigment{
rgb M()}}N(D,(D[I]>99?I:I+1))#end#end#macro M()<mod(D[I],13)-6,mod(div(D[I
],13),8)-3,10>#end blob{N(array[6]{11117333955,
7382340,3358,3900569407,970,4254934330},0)}// - Warp -
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in news:3bcc5ffb@news.povray.org Warp wrote:
> I think that the section "6.10.3 Photons and Light Sources" is a
> bit
> confusing because first there's one version of the photons-block
> inside a light source and then another.
I do not exactly understand what you mean, but after looking at it I
noticed that example and syntax are swapped. The second part should
come first. The first part should be marked as an example. Would this
solve your problem?
> Also the 'area_light' switch should be explained.
Never tried it, so if someone can explain me what it does?
Ingo
--
Photography: http://members.home.nl/ingoogni/
Pov-Ray : http://members.home.nl/seed7/
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"ingo" <ing### [at] home nl> wrote in message
news:Xns### [at] povrayorg...
> in news:3bcc5ffb@news.povray.org Warp wrote:
>
> > Also the 'area_light' switch should be explained.
>
> Never tried it, so if someone can explain me what it does?
Allows the area light in a light source to be used instead of its usual
point source. Not much to explain there I guess, which is probably why it
wasn't.
If there's anything more to it than that it'd be Nathan whom would know.
Bob H.
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ingo <ing### [at] homenl> wrote:
:> Also the 'area_light' switch should be explained.
: Never tried it, so if someone can explain me what it does?
AFAIK photons are by default shot from the location of the light source, no
matter if it's an area light or not. However, if the light is an area light
and you specify 'area_light' in its photons block, then the photons will be
shot from all parts of the area light (perhaps randomly?).
--
#macro N(D,I)#if(I<6)cylinder{M()#local D[I]=div(D[I],104);M().5,2pigment{
rgb M()}}N(D,(D[I]>99?I:I+1))#end#end#macro M()<mod(D[I],13)-6,mod(div(D[I
],13),8)-3,10>#end blob{N(array[6]{11117333955,
7382340,3358,3900569407,970,4254934330},0)}// - Warp -
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in news:3bcddc64@news.povray.org Warp wrote:
> However, if the light is an area light
> and you specify 'area_light' in its photons block, then the photons
> will be shot from all parts of the area light (perhaps randomly?).
That would mean we have a real 'soft light'.
Nathan, can you confirm, please.
Ingo
--
Photography: http://members.home.nl/ingoogni/
Pov-Ray : http://members.home.nl/seed7/
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ingo <ing### [at] homenl> wrote:
: That would mean we have a real 'soft light'.
It means that the caustics will simulate a lot better those of an area
light instead of a point light.
The 'soft light' part is made by the shadow testing routine, which has
little to do with photons (AFAIK).
--
#macro N(D,I)#if(I<6)cylinder{M()#local D[I]=div(D[I],104);M().5,2pigment{
rgb M()}}N(D,(D[I]>99?I:I+1))#end#end#macro M()<mod(D[I],13)-6,mod(div(D[I
],13),8)-3,10>#end blob{N(array[6]{11117333955,
7382340,3358,3900569407,970,4254934330},0)}// - Warp -
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On 18 Oct 2001 02:50:48 -0400, Warp wrote:
>ingo <ing### [at] homenl> wrote:
>: That would mean we have a real 'soft light'.
>
> It means that the caustics will simulate a lot better those of an area
>light instead of a point light.
> The 'soft light' part is made by the shadow testing routine, which has
>little to do with photons (AFAIK).
Not entirely. It's also a function of the diffuse illumination routine,
which determines the intensity of the light by the angle to the center
of the area light rather than by integrating the illumination over the
entire area of the area light. Photons might be able to even that out
a little.
--
plane{-z,-3normal{crackle scale.2#local a=5;#while(a)warp{repeat x flip x}rotate
z*60#local a=a-1;#end translate-9*x}pigment{rgb 1}}light_source{-9red 1rotate 60
*z}light_source{-9rgb y rotate-z*60}light_source{9-z*18rgb z}text{ttf"arial.ttf"
"RP".01,0translate-<.6,.4,.02>pigment{bozo}}light_source{-z*3rgb-.2}//Ron Parker
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