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While experimenting with some code, I was using a shadowless light, and noticed
that I wasn't getting a phong highlight on a sphere with that finish.
Is this for some reason the intended behaviour, or an actual bug?
Minimal scene:
#version 3.8;
global_settings {assumed_gamma 1.0}
#declare Camera_Orthographic = true;
#declare Camera_Position = <0, 0, -100> ;
#declare Camera_Look_At = <0, 0, 0> ;
// functions as a zoom for the orthographic view: 4 zooms in 4x, 8 zooms in 8x,
etc.
#declare Fraction = 75;
// ###########################################
camera {
#if (Camera_Orthographic = true)
orthographic
right x*image_width/(Fraction)
up y*image_height/(Fraction)
#else
right x*image_width/image_height
up y
#end
location Camera_Position
look_at Camera_Look_At}
// ###########################################
sky_sphere {pigment {rgb <1, 1, 0.8>}}
#declare LS = <10, 10, -20>;
light_source {LS rgb 1 } //shadowless}
#declare Color = z*0.2; //<1, 0.9, 0.0>;
sphere {0, 1.2 texture {pigment {rgb Color} finish {phong 1}} }
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"Bald Eagle" <cre### [at] netscape net> wrote:
> While experimenting with some code, I was using a shadowless light, and noticed
> that I wasn't getting a phong highlight on a sphere with that finish.
>
> Is this for some reason the intended behaviour, or an actual bug?
>...
It looks like a bug to me. I can confirm that the behavior is the same for
POV-Ray for Windows Version 3.7.0.msvc10.win64 (The official version)
Here's a minimal scene for v3.7:
// ===== 1 ======= 2 ======= 3 ======= 4 ======= 5 ======= 6 ======= 7
#version 3.7;
global_settings { assumed_gamma 1.0 }
sphere {
0*z, 2
texture {
pigment { color blue 0.2 }
finish { phong 1 }
}
}
background { color rgb <1.0, 1.0, 0.8> }
light_source {
100*<1, 1, -2>
color rgb <1, 1, 1>
shadowless
}
camera {
translate -10*z
}
// ===== 1 ======= 2 ======= 3 ======= 4 ======= 5 ======= 6 ======= 7
--
Tor Olav
http://subcube.com
https://github.com/t-o-k
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On 2022-11-20 13:55 (-4), Bald Eagle wrote:
> While experimenting with some code, I was using a shadowless light, and noticed
> that I wasn't getting a phong highlight on a sphere with that finish.
>
> Is this for some reason the intended behaviour, or an actual bug?
It is documented non-judgmentally, which suggests that it is deliberate.
See:
https://wiki.povray.org/content/Reference:Light_Source#Shadowless_Lights
As for why, I can only guess. But I tend to use shadowless lights as
fill lighting, for which highlights are undesirable anyway. Perhaps the
dev team had the same idea.
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Cousin Ricky <ric### [at] yahoocom> wrote:
> On 2022-11-20 13:55 (-4), Bald Eagle wrote:
> > While experimenting with some code, I was using a shadowless light, and noticed
> > that I wasn't getting a phong highlight on a sphere with that finish.
> >
> > Is this for some reason the intended behaviour, or an actual bug?
>
> It is documented non-judgmentally, which suggests that it is deliberate.
> See:
> https://wiki.povray.org/content/Reference:Light_Source#Shadowless_Lights
>
> As for why, I can only guess. But I tend to use shadowless lights as
> fill lighting, for which highlights are undesirable anyway. Perhaps the
> dev team had the same idea.
"Also note that shadowless lights will not cause highlights on the illuminated
objects."
Well ... not a bug, and your reasoning makes sense.
I was just taken off guard, as it was my only light source.
Thank you, Sir.
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