> I tried rendering the following code (the "D" from the "Dell" logo). But noticed
> some abnormal variations when setting the transmit level at something other than
> 1.0 (The result can be viewed at
> http://news.povray.org/web.4d69b460174945fc3690bb990%40news.povray.org)
>
> Is this a bug or is there something I'm not doing correctly?
>
>
>
> #declare f_height=1.20;
> #declare f_width=1.1;
> #declare f_inner_begin=0.40;
> #declare o_d_of_dell=
> prism {
>          linear_sweep
>          bezier_spline
>          -1.00 ,1.00 , 36
>          <0.00, 0.04>,<  0.00,  0.50>,<  0.00, 0.50>,<0.00, f_height>,
>          <0.00, f_height>,<0.20, f_height>,<0.20, f_height>,<0.40, f_height>,
>          <0.40, f_height>,<  0.65,  f_height>,<  f_width, 1.15>,<f_width, 0.62>,
>          <f_width, 0.62>,<  f_width,  0.09>,<  0.65, 0.04>,<f_inner_begin,
> 0.04>,
>
>          <f_inner_begin, 0.04>,<f_inner_begin, 0.22>,<f_inner_begin, 0.22>,
> <f_inner_begin, 0.40>,
>          <f_inner_begin, 0.40>,<0.64, 0.40>,<0.68, 0.53>,<0.68, 0.64>,
>          <0.68, 0.64>,<0.68, 0.78>,<0.54, 0.84>,<0.40, 0.84>,
>          <0.40, 0.84>,<0.40, 0.44>,<0.40, 0.44>,<0.40, 0.04>,
>
>
>
>
>          <0.40, 0.04>,<  0.20,  0.04>,<  0.20, 0.04>,<0.00, 0.04>
>
>
>          rotate<-90,0,0>
>          translate<0,0,1>
>        }
>
> object{ o_d_of_dell pigment{color White transmit 0.80} rotate y*0 rotate x*0}
>
>

Hard to tell without the rest of the scene or at least the light's position.

It looks like those darker gerions may be due to self shadowing with a 
light placed to the right and somewhat low and relatively close.

Try moving the light around and see what you get.



Alain

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