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Hi everyone!
I have a problem with the Looks_Alike feature of light sources. Please see
here an excerpt of my code:
#declare Signal=sphere // Signal Light
{
< 0.0, 0, 0.0 > 0.05
pigment { rgb < 0.8117647, 0.8941176, 0.5607843 > * 10 }
finish { ambient 1.0 }
// no_shadow
}
#declare SignalLight=light_source
{
< 0.0, 0.0, 0.0 > color rgb < 0.8117647, 0.8941176, 0.5607843 > * 100
looks_like { Signal }
fade_distance 0.9
fade_power 3.0
}
Okay. When I now place such a "Signal Light" object, there is still no light
effect. If I remove the Looks_Alike, the light is there. What is it I do
wrong?
Thanks for your help.
Sven
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"Sven Littkowski" <sve### [at] jamaica-focus com> wrote in message
news:45571fc3@news.povray.org...
> Hi everyone!
>
> I have a problem with the Looks_Alike feature of light sources. Please see
> here an excerpt of my code:
>
> #declare Signal=sphere // Signal Light
> {
> < 0.0, 0, 0.0 > 0.05
> pigment { rgb < 0.8117647, 0.8941176, 0.5607843 > * 10 }
> finish { ambient 1.0 }
> // no_shadow
> }
>
> #declare SignalLight=light_source
> {
> < 0.0, 0.0, 0.0 > color rgb < 0.8117647, 0.8941176, 0.5607843 > * 100
> looks_like { Signal }
> fade_distance 0.9
> fade_power 3.0
> }
>
> Okay. When I now place such a "Signal Light" object, there is still no
> light effect. If I remove the Looks_Alike, the light is there. What is it
> I do wrong?
>
> Thanks for your help.
>
> Sven
Hi Sven,
I'm not sure what you're saying is wrong with this.
I just added the following lines and I get a white sphere as I'd expect
given the very high brightness of the values you have set for the colors,
(the values get clipped and you lose the subtle green shading).
camera { location <0,0.1,-0.5> }
light_source { SignalLight }
plane {y,0 pigment {color rgb 0.01} translate -y*0.2}
I tried moving the light source around the scene a bit in case that was what
you meant, but I still get both the lighting effect and the visible light
source.
I'm on the Windows 3.6 Version.
Regards,
Chris B.
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Hi Chris B.,
I am using the latest beta 3.7. My problem is, that the little sphere is
enlighted, but that there is no light spot at the underground I put the
little sphere atop. Usually, it should behave light a tiny lightbulb. But
just the sphere is bright, the environment near to the sphere is still
dark...
It looks like the sphere blocks the flow of the light.
Sven
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"Sven Littkowski" <sve### [at] jamaica-focus com> wrote in message
news:4557cacf$1@news.povray.org...
> Hi Chris B.,
>
> I am using the latest beta 3.7. My problem is, that the little sphere is
> enlighted, but that there is no light spot at the underground I put the
> little sphere atop. Usually, it should behave light a tiny lightbulb. But
> just the sphere is bright, the environment near to the sphere is still
> dark...
>
> It looks like the sphere blocks the flow of the light.
>
> Sven
Hi Sven,
Hmm. I do get a light spot on the plane that I put beneath the light_source.
Obviously it has to be within range of the 'fade' specified, so anything
more than a couple of POV-Ray units away isn't going to get much light, but
that would be the case with or without the 'looks_like' clause, so I'm
assuming that's not your problem.
Just a thought;- did you check the release notes for the 3.7 Beta to make
sure the various features that you're using are fully implemented? As well
as the 'looks_like' clause I'd recommend checking for any surface features
or media features that you're using that might be incomplete in that Beta
test version.
Regards,
Chris B.
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