// Persistence Of Vision raytracer version 3.1 sample file.
#version 3.7;

#declare RAD = 1;
global_settings {
	assumed_gamma 1.0
	#if (RAD = 1)
		radiosity {
			pretrace_start 0.08
			pretrace_end   0.04
			count 35
			nearest_count 5
			error_bound 1.8
			recursion_limit 3
			low_error_factor .5
			gray_threshold 0.0
			minimum_reuse 0.015
			brightness 1
			adc_bailout 0.01/2
			normal on
			media on
		}
	#end
}



camera {
	location <0, 10, -27>
	right <4/3, 0, 0>
	look_at <0, 6, 0>
	angle 90
}


#if (RAD != 1)
	light_source {
		<0, 25, -10>
		color rgb <1,1,0>*2
		spotlight               
		point_at <2.5, 0, 2.5>  
		radius 50               
		tightness 5            
		falloff 60             
	}

	light_source {
		<200, 45, 200>
		color rgb <1,1,0>*2
		spotlight             
		point_at <250, 40, 205> 
		radius 10               
		tightness 5            
		falloff 16             
	}

	light_source {
		<-1500,50,5000>
		color rgb 4.5   
	area_light
	<6, 0, 0> <0, 0, 6> // lights spread out across this distance (x * z)
	4, 4                // total number of lights in grid (4x*4z = 16 lights)
	adaptive 2          // 0,1,2,3...
	jitter              // adds random softening of light
	circular            // make the shape of the light circular
	orient              // orient light
		
		looks_like {
			sphere { 0*x, 50 pigment {color <1,1,0> } }
		}
		photons {
			refraction on
			reflection on
			area_light
		}
	}
#end





#declare F1 = 	finish {
	diffuse 0.5
	reflection 0.95
	refraction on
}




#declare R = 4;
#declare S = 1;
#declare P1 = pigment {rgbt <1,1,1,1>}

// here the medias interior, play with it, try and taste.
#declare I1 = interior{
	media{
		emission 1
		density{
			//spherical
			cylindrical
			turbulence 0.321
			density_map{
				[0 rgb 0]
				[0.4 rgb <0,0,1>]
				[0.8 rgb <0,1,1>]
				[1 rgb 1]
			}
		}
	}
}

#declare I2 = interior{
	media{
		emission 1
		density{
			spherical
			density_map{
				[0 rgb 0]
				[0.4 rgb <1,0,0>]
				[0.8 rgb <1,1,0>]
				[1 rgb 1]
			}
		}
	}
}

#local P2 = texture {
	pigment {
		color srgb <0.1,0.1,0.1*10> transmit 1 filter 1
	}
	finish {
		ambient 0.7
		diffuse 0
	}
}

#declare I3 = interior {ior 2.61}

#local r2= 1.25;
#local C = 10;
#declare OB1 = union {

// first sphere with media
	sphere { 0,1.0  hollow pigment{P1} interior{I2} scale R translate <15,0,0> }
// second sphere encapsuling the first to obtain glow effect//	
	sphere { 0,r2  hollow texture{P2} interior{I3} scale R translate <15,0,0> }

	sphere { 0,1.0  hollow pigment{P1} interior{I2} scale R translate <-15,0,0>  }
	sphere { 0,r2  hollow texture{P2} interior{I3} scale R translate <-15,0,0> }

	sphere { 0,1.0  hollow pigment{P1} interior{I2} scale R translate <5,0,0>  }
	sphere { 0,r2  hollow texture{P2} interior{I3} scale R translate <5,0,0> }

	sphere { 0,1.0  hollow pigment{P1} interior{I2} scale R translate <-5,0,0>  }
	sphere { 0,r2  hollow texture{P2} interior{I3} scale R translate <-5,0,0> }


	sphere { 0,1.0  hollow pigment{P1} interior{I1} scale R translate <-15,10,0> }
	sphere { 0,r2  hollow texture{P2} interior{I3} scale R translate <-15,10,0> }

	sphere { 0,1.0  hollow pigment{P1} interior{I1} scale R translate <+15,10,0>  }
	sphere { 0,r2  hollow texture{P2} interior{I3} scale R translate < 15,10,0> }

	sphere { 0,1.0  hollow pigment{P1} interior{I1} scale R translate <-5,10,0> }
	sphere { 0,r2  hollow texture{P2} interior{I3} scale R translate <-5,10,0> }

	sphere { 0,1.0  hollow pigment{P1} interior{I1} scale R translate <+5,10,0>  }
	sphere { 0,r2  hollow texture{P2} interior{I3} scale R translate < 5,10,0> }
}


object {
	OB1
	finish {F1}
	photons{
		target 1.40          // spacing multiplier for photons hitting the object
		refraction on
		reflection on
	}
}



plane {
	y,-12
	pigment {color rgb <0.7,0.7,0.7>}
}