Was straight from a render to posting it.  Not that it means anything the
way things are going at the moment while I try to track down a weird
transparency thing {bug}  :-)

Oh, make sure the area remains 'hollow' for that cone media of course, if
you add things into your scene you don't want a plane or surrounding sphere
to cut off the media.  And there was a ground plane so that will be seen to
cut through the cone of light, however out beyond it.

bob h

"Mitchell Waite" <mit### [at] dnaicom> wrote in message
news:3c4533c4$1@news.povray.org...
> Bob have you tried this? I get completely black when I run it in 3.5. When
I
> run the prior one I do get a spot light but it has a strange anomoly where
> there seems to be a change in shade at about one third down the cone.
>
> "bob h" <omn### [at] charternet> wrote in message
> news:3c424849$1@news.povray.org...
> > Here it is with scattering so shadows show up in the light beam.
> > Admittedly, I don't know geometry well enough to keep the distance and
> width
> > of light beam in sync.  Must be a formula for keeping angle relative to
> the
> > cone apex height and base diameter ratio.
> > BTW, this was fairly quick for me to render.
> >
> > #declare F=1.333; // fudge factor
> > #declare D=10*F; // distance
> > #declare S=5*F; // scale
> >
> > #declare ConeOfLite=
> > cone {
> >         0,0,y,1
> >         pigment {rgbt 1}
> >         interior {
> >                 media {
> >                         emission 1/3/S // intensity of air glow
> >                         scattering {1,0.2}
> >                         density {
> >                                 cylindrical
> >                                 }
> >                 }
> >         }
> >  scale <S,D,S> // x and z are width, y is length or distance
> >  hollow
> > }
> >
> > light_source {
> >   0, 1
> >   spotlight
> >   point_at y
> >   radius 6*S
> >   falloff 12*S
> >   looks_like {ConeOfLite}
> >  rotate <120,90,0> translate <-3,2,0>
> > }
> >
> > plane {y,-1
> >         pigment {rgb <.9,.6,.3>}
> > }
> >
> > sphere {0,1 pigment {rgb .5}}
> >
> >
> >
>
>

Post a reply to this message