Most likely a 'tightness' thing. Defaults to 10 if not used and can be
from 0 to 100 near as I know.  If someone knows the intricities of how
it works though, I'd be a willing listener.

Bob

Rune S. Johansen <run### [at] inamecom> wrote in message
news:37dba28e@news.povray.org...
> /*
> When I use spotlight then why is the light intensity
> not at full intensity within the "radius" angle?
>
> In the following example when I use normal point light
> the whole plane is full illuminated. with spotlight I
> expected the area inside the red lines to be full
> illuminated but it is not so at all. Why? I can't find
> the answer in the docs.
> */
>
> // off = normal light, on = spotlight.
> #declare Spotlight = on;
>
> // angle for both "radius" and "falloff".
> #declare Angle = 60;
>
> camera {
>    location 100*y
>    look_at 0
> }
>
> plane {
>    y, -0.001
>    pigment {color rgb 1}
>    finish {ambient 0 diffuse 1 brilliance 0}
> }
>
> light_source {
>    0, color 1
>    #if (Spotlight=on)
>       spotlight
>       radius Angle
>       falloff Angle
>       point_at x
>    #end
> }
>
> cylinder {y, y+100*x, 0.5 rotate +Angle*y pigment {color red 1}
finish
> {ambient 1 diffuse 0}}
> cylinder {y, y+100*x, 0.5 rotate -Angle*y pigment {color red 1}
finish
> {ambient 1 diffuse 0}}
>
> /*
> Greetings,
>
> Rune S. Johansen
>
> ---
> Visit The RSJ Website at http://rsj.mobilixnet.dk
> for 3D images including still lives, dragons,
> mathematical shapes, and more. Stereograms,
> tutorials, The POV Desktop Theme, hundreds of
> raytracing jokes, miscellaneous other things,
> and a lot of fun!
> */
>
>

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