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I got no reply on my previous post, so I'll try again.
The following code should in my understanding produce a redish sphere
(attenuation of colors appearing behind the sphere) but no shadow with
media_attenuation off on the light source.
////////////////////
camera {location -z*4.0}
background{color rgb .7}
light_source {<-30, 60, 30> color rgb 1
media_interaction off
media_attenuation off
}
box {<-2,-1.2,-2><2,-1,2> pigment { color rgb 1 } finish{diffuse .9}}
sphere { 0.0, 1 hollow
pigment {rgbt 1}
interior{
media{absorption rgb <0,1,1>}
//media{scattering{1 rgb <1,0,0>*5 extinction 0 }}
}
}
////////////
POV 3.1 seems to respond appropriately, but both MegaPOV and POV 3.5 do
not respond to media_attenuation (or media_interaction for that matter)
with absorption media. Sample pics posted in povray.beta-test.binaries.
Can someone substantiate this?
Abe
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in news:3C880122.9C9C0CE4@taconic.net Abe wrote:
> sphere { 0.0, 1 hollow
> pigment {rgbt 1}
If you change it to :
sphere { 0.0, 1 hollow
pigment {rgbf 1}
You also get the shadow in 3.1g.
To get no shadow in 3.5 you have to use no_shadow in the object. The
difference in behaviour between rgbf an rgbt that was there in 3.1 was a
bug that is fixed in 3.5. See:
"2.6.14 Changed features that may 'break' old scenes"
and "6.8 Media" near the end.
Also the documentation gives me the impression that media_interaction
and media_attenuation are for use with atmospheric media only.
"6.5.7.10 Atmospheric Media Interaction" and "6.5.7.11 Atmospheric
Attenuation".
My impression, or the docs, may be wrong here.
Ingo
Ingo
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Hmm. I have used the no_shadow flag you suggested also, but that will
turn off any shadows cast by surface textures. I guess it does come down
to the filter v. transmit behavior in 3.1. Phooy!
Anyway, thanks much for your reply!
Abe
ingo wrote:
>
> in news:3C880122.9C9C0CE4@taconic.net Abe wrote:
>
> > sphere { 0.0, 1 hollow
> > pigment {rgbt 1}
>
> If you change it to :
>
> sphere { 0.0, 1 hollow
> pigment {rgbf 1}
>
> You also get the shadow in 3.1g.
> To get no shadow in 3.5 you have to use no_shadow in the object. The
> difference in behaviour between rgbf an rgbt that was there in 3.1 was a
> bug that is fixed in 3.5. See:
> "2.6.14 Changed features that may 'break' old scenes"
> and "6.8 Media" near the end.
>
> Also the documentation gives me the impression that media_interaction
> and media_attenuation are for use with atmospheric media only.
> "6.5.7.10 Atmospheric Media Interaction" and "6.5.7.11 Atmospheric
> Attenuation".
> My impression, or the docs, may be wrong here.
>
> Ingo
>
> Ingo
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"Abe" <bul### [at] taconic net> wrote in message
news:3C89604E.36473A82@taconic.net...
> Hmm. I have used the no_shadow flag you suggested also, but that will
> turn off any shadows cast by surface textures. I guess it does come down
> to the filter v. transmit behavior in 3.1. Phooy!
Ha, well, I believe the real problem (which actually is not one) is due to
the fact absorbing and emitting media both do not react according to light
sources in the way scattering does. Those are different things. absorption
and emission do not rely on light.
bob h
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