fade power and fade distance don't simulate scattering. To get a fairly accurate
model you should use scattering media.

Though you can probably fake the effect quite cheaply using a completely thin
object (e.g. a triangle) and pov's double_illuminate flag.

--
Tek
http://www.evilsuperbrain.com


George <nomail@nomail> wrote in message
news:web.3e03c27775f9e51c514daf780@news.povray.org...
> Hello
>
> I am Trying to get the same effect one has when holding a
> semi-transparent piece of paper (rice paper for example)
> into a laser. The Laser passes through but a lot of light
> is scattered and an bright Spot apears on the paper.
> Right now I am using the following to create the paper:
>
> box{<-2.5e-02,-2.5e+01,-2.5e+01>,<2.5e-02,2.5e+01,2.5e+01>
>   interior{fade_power 2 fade_distance 3000}
>   texture{pigment{color 1.0*White transmit 0.75}}
>   translate <1.6e+02,0,0> }
>
> However I do not get the bright spot due to scattering.
> What am I missing?
>
> Regards,
>
> George
>
>

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