I see you're keeping the tilted lighthouse though ;)
Spiders may be right, and maybe not. The beam crosses nearly
perpendicular, I would suppose, to the observer due to the perspective
camera angle. This would be seen as a much diminished beam at such a
point. Are you using 'scattering' type 5? If not, you might want to try
it out, and set 'eccentricity' to greater than 0.

Mark Palmquist wrote:
> 
> I was inspired by your post to start playing with media, I came up
> with the following scene (very sparce) with what I think the beam
> should look like.
> 
> Would anyone like to comment on the beam effect?  any ideas are
> welcome.
> 
> [Image]
> 
> the source:
> 
> //begin*******************************
> 
> // Persistence of Vision Ray Tracer Scene Description File
> // File: lighthouse.pov
> // Vers: 3.1
> // Desc: spotlight/media interaction test
> // Date: 02/07/99
> // Auth: Mark Palmquist
> // uses bricks.inc by Jeff Lee
> //
> #include "colors.inc"
> #include "metals.inc"
> #include "glass.inc"
> 
> 
> camera {location < 0, 16, -600>
>   right 4/3*x
>   up y
>   direction z
>   angle 65
>   look_at <0, 105, 0>
> }
> 
> light_source { <150, 500, 500>
>   color rgb 2
>   media_interaction off
>   //shadowless
> }
> 
> #declare Lightbulb = union {
>     merge {
>       sphere { <0,0,0>,1 }
>       cylinder { <0,0,1>, <0,0,0>, 1
>         scale <0.35, 0.35, 1.0>
>         translate  0.5*z
>       }
>       texture {
>         pigment {color rgb <1, 1, 1>}
>         finish {ambient .8 diffuse .6}
>       }
>     }
>     cylinder { <0,0,1>, <0,0,0>, 1
>       scale <0.4, 0.4, 0.5>
>       texture { T_Brass_1A }
>       translate  1.5*z
>     }
>     //rotate -90*x
>     scale 2
> }
> #declare beam=
> union{
>   light_source { <0, .1, 0> color rgb<1, 1, 1>*4
>     spotlight
>     point_at <0, 10, 0>
>     radius 1
>     falloff 8
>     media_attenuation on
>     looks_like {Lightbulb}
>     }
>   cone {<0,0,0>, 0, <0,1000,0>, 360 open hollow interior {media
>      {
>       intervals 43
>       absorption .01
>       scattering {1, rgb 0.02}
>       samples 1, 10
>       confidence 0.9999
>       variance 1/1000
>       ratio 0.9
>      }
>      }
>      pigment{Clear}
>   }
>   rotate <0,0,-93>
> }
> 
> #declare newBrickMidtone=colour rgb <0.60,0.60,0.60>
> #declare newBrickHighlight=colour rgb <0.75,0.70,0.70>
> #declare newBrickLowlight=colour rgb <0.35,0.35,0.35>
> #include "bricks.inc" //Author: Jeff Lee
> 
> #declare lighthouse=
> union{
>   object { beam translate <12.1,110,0>}
>   cone {<0,0,0>, 20, <0,100,0>, 15 texture { T_newBrick scale
> <1,2,18>}}
>   merge{
>     cylinder{  100*y,  120*y,  12 texture {T_Glass3}}
>     difference {
>       sphere { 120*y, 12}
>       box { <-15,100,-15>  <-15,120,-15>}
>       texture {T_Brass_3C}
>     }
>   }
> }
> 
> object {lighthouse translate <-200,0,0>}
> 
> //end*******************************
> 
> Darcy Johnston wrote:
> 
> > Well, some time ago, I posted an image depicting my model of the
> > Hatteras
> > lighthouse. Here it is again in a scene.
> >
> > Please let me know what you think of it.
> > Thanks,
> > Darcy
> > djo### [at] inamecomNOSPAM
> > http://www.geocities.com/SiliconValley/Sector/4317
> 
> 

-- 
 omniVERSE: beyond the universe
  http://members.aol.com/inversez/POVring.htm
=Bob

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