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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}
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Am 27.02.2011 03:28, schrieb Woody:
> 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?
Hard to tell without knowing the placement of your light_source.
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> 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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