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I apparently don't understand how to use light_groups in POV-Ray and I'm
hoping someone will help me understand them better. I've constructed a
scene in which I want two parts lit by completely seperate groups of
lights. It's important for the illusion I'm trying to create. I've placed
one set of lights and objects into one light_group, and the other into a
seperate light_group, kind of like below:
light_group {
// one or more light sources
light_source { ... }
// objects
object { ... }
.
.
.
object { ... }
}
light_group {
light_source { ... }
object { ... }
.
.
.
object { ... }
}
I have not used the global_light keyword in either light group and I have no
global light sources. Nevertheless, both sets of objects are being lit by
both sets of lights. It's very frustrating. Does anyone know if there is
a bug in the light_groups and if so how I can work around it?
Thanks,
Ray
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"Hughes, B." <bob### [at] charter net> wrote:
> "rben" <ray### [at] comcastnet> wrote in message
> news:web.41313731973db5f8497bbfc0@news.povray.org...
> > scene in which I want two parts lit by completely seperate groups of
> > lights.
> > I have not used the global_light keyword in either light group and I have
> > no global light sources. Nevertheless, both sets of objects are being lit
> > by both sets of lights.
>
> Checked on it using 3.6.1.icl8.win32. Seems okay, each light only lit the
> object within its own group.
It's possible that it's subtle. My scene is very complex and involves over
100,000 tokens and multiple light sources. I'll try to see if I can
recreate the problem with a simpler model.
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"Hughes, B." <bob### [at] charternet> wrote:
> "rben" <ray### [at] comcastnet> wrote in message
> news:web.41313731973db5f8497bbfc0@news.povray.org...
> > scene in which I want two parts lit by completely seperate groups of
> > lights.
> > I have not used the global_light keyword in either light group and I have
> > no global light sources. Nevertheless, both sets of objects are being lit
> > by both sets of lights.
>
> Checked on it using 3.6.1.icl8.win32. Seems okay, each light only lit the
> object within its own group.
Try the following code:
#version 3.5;
#include "colors.inc"
global_settings {
assumed_gamma 1.0
ambient_light .3
}
// ----------------------------------------
camera {
location <0.0, 0.5, -4.0>
direction 1.5*z
right x*image_width/image_height
look_at <0.0, 0.0, 0.0>
}
sky_sphere {
pigment {
gradient y
color_map {
[0.0 rgb <0.6,0.7,1.0>]
[0.7 rgb <0.0,0.1,0.8>]
}
}
}
//light_source { <0, 0, 0> color White translate <-30, 30, -30> }
// ----------------------------------------
light_group {
light_source { <-100, 100, -100> color Red }
//light_source { <-5,3,-10> color Green }
sphere { <0, 0, 0>,0.5
pigment { color White }
translate <-1,0,1>
}
plane { y, -1 pigment { White } } // this plane gets shadows from both
spheres!
box {0, <1,1,5> rotate -30*y pigment {White} translate <1.5,-1,.5>} // same
with this box
//global_lights
}
light_group {
light_source { <100, 100, 100> color rgb Yellow }
sphere { <0, -1, .5>,0.5 pigment { color White } }
//global_lights
}
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"Slime" <fak### [at] emailaddress> wrote:
> > Ah yes... shadows... I couldn't say with absolute certainty if shadows are
> a
> > separate matter from light appearing *on* grouped objects. I see your
> point
> > now, though. I checked the help and I thought it might specify something
> > about shadows.
>
>
> All objects cast shadows for all light sources, regardless of whether they
> accept the light from the light source.
>
> - Slime
> [ http://www.slimeland.com/ ]
ouch! Well, now I'll have to rethink how to do this scene I'm working on.
In order to get the effect I want there shouldn't be shadows from all the
light sources. Guess I'll just have to live with it. Thanks for answering
my question, I appreciate you taking the time.
Ray
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