On 09/17/2012 07:28 AM, James Holsenback wrote:
> Already tried that incantation. Still think photons and light_group is a
> no go. I'll prepare a better example when I get a chance.

OK ... below is a simplified scene used to show the problem I'm having. 
The scene is initially setup with the Key_Light as the photon source and 
/without/ the light_group ... it shows that indeed it does shoot photons 
properly.

Now remove comments from around the light_group code in the Ring 
definition, and in the Key_Light change reflection/refraction from /on/ 
to /off/ (now I want the Stone_Light to be the photon source) and see 
what I mean.

Maybe not related but why does the stone shadow /still/ appear to be 
coming from the Key_Light and /not/ the Stone_Light ... I have 
global_lights set to off in the light_group!

Here's the scene file:
// render using: povray +p +w1120 +h630 Work.pov
#version 3.7;

#default {finish {ambient 0 emission 0 diffuse 0.6}}

#declare PQ = 1;

#if (PQ > 0)
   #declare UsePhotons = yes;
   #declare PhotonRun = yes; // change to "no" to reuse a map
#end

#switch (PQ)
   #case (0)
     #declare UsePhotons = no;
   #break
   #case (1)
     #declare S_val = 0.1;
     #declare T_val = 5;
		#declare C_val = 15000;
   #break
   #case (2)
     #declare S_val = 0.025;
      #declare T_val = 10;
		#declare C_val = 30000;
   #break
   #case (3)
     #declare S_val = 0.00625;
     #declare T_val = 50;
		#declare C_val = 60000;
   #break
#end

global_settings {
	max_trace_level 64
	adc_bailout 0.00001
	noise_generator 3
	assumed_gamma 1.0
	#if(UsePhotons)
		photons {
			spacing S_val
			autostop 1
			max_trace_level T_val
			count C_val
			#if (PhotonRun)
				save_file "Work.ph"
			#else
				load_file "Work.ph"
			#end
			}
	#end
	}

camera {
	perspective
	location <0,0,-10>
	rotate x*35
	rotate y*10
	look_at <0,1,0>
	right  x*4/3
	direction 1*z
	}

#declare Key_Light =
light_source {
	#declare LightColor = srgb 1;
	0, LightColor
	translate <0,0,-15>
	#if (UsePhotons)
		photons { reflection on refraction on }
	#end
	}

// -- The Stone Light ( in a light_group )
#declare Stone_Light =
light_source {
	#declare LightColor = srgb 1;
	0, LightColor
	translate <0,2,5>
	looks_like {sphere {0,0.125 pigment { srgb <1,1,0>}} }
	#if (UsePhotons)
		photons { reflection on refraction on }
	#end
	}

#declare Stone =	
sphere { 0,1
	material{
	texture{
		pigment{
			srgbf <0.4980, 0.2902, 0.4235,1>
			}
		normal { facets coords 1 size 0.25}								
		finish{
			specular 1
       			roughness 0.01
			diffuse 0.6
			reflection{
				srgb <0.4980, 0.2902, 0.4235>*0.1, srgb <0.4980, 0.2902, 
0.4235>*0.125 fresnel on
				}
			}
		}
	interior {
		ior 1.75
		fade_distance 2
		fade_power 1001
		fade_color <0.4980, 0.2902, 0.4235>
		#if (UsePhotons)
			caustics 1.0
			dispersion 1.05
			dispersion_samples 10
		#end
		}
	}
	#if (UsePhotons)
		photons { target reflection on refraction on collect off }
	#end
	}

#declare Band =
torus { 3,0.25
	material{
		texture{
			pigment{
				srgb <0.8100,0.7100,0.2300>
				}
			finish{
				specular 0.8
				roughness 0.1
				diffuse 0.6
				metallic
				brilliance 5
				reflection{srgb <0.8100,0.7100,0.2300>*0.75, srgb 
<0.8100,0.7100,0.2300>}
				}
			}
		}
	}

#declare Ring =
union {
	//light_group {
		object{
			Stone
			#if (UsePhotons)
				photons { target reflection on refraction on collect off }
			#end
			}
		//light_source { Stone_Light }
		//global_lights off
		//}
	object{
		Band
		translate x*3.95
		}
	translate <-3.95/2,2,0>
	}

object { Key_Light rotate x*45 rotate y*30 }
background { srgb 1 }
plane { y,0 pigment { srgb 1 } }
object { Ring }

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