Crippso wrote:

> thanks Clipka, ok so I try the code below to try and see the fresnel reflected
> light from the mirror onto a diffuse disc but it still doesnt work. Am i doing
> something wrong?

shooting photons perpependicular to the mirror surface as
in your setup is precisely where fresnel reflection is 0.
I moved the mirror and light and get a rectangle on the
disc that is the reflected image of the box.

Also note that the diffuse surface does not require
a photon block as it should not be a target, and collect
is on by default. Also you'll get a more interesting
reflection if you remove parallel and point_at.


#local p_start  = 0.1;
#local p_end_final = 0.05;

#local final_eb  = 0.5;
#local final_count = 50000;


#default {finish {ambient 0 diffuse 0}}

global_settings
{
   assumed_gamma 1
   max_trace_level 50 photons{count 575000}
}


camera
{
   orthographic
   location <0,0,1>
   look_at  <0,0,-1>
   angle 90
}

light_source{<10,0,-1>, 1 parallel point_at <5,0,2>}

box
{
   <-0.5,-0.5,2> <0.5,0.5,3>
   pigment{rgbt 1}
   finish
   {
     reflection{0,1 fresnel}
     conserve_energy
   }
   interior{ior 1.5}
   photons
   {
     target
     reflection on
     refraction on
     collect off
   }
   translate 5*x
}


disc
{
   <0,0,-1> <0,0,1> 1
   pigment{rgb 1}
   finish{diffuse 1.0}
}

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