[Radiance-general] Uniform sky

[Joe Smith]

Hi, Vera, may I ask what you mean by "ground truth pixel value"?

- JS

Vera Liu <lizzielyh at gmail.com>于2014年5月5日星期一写道：

> Hi Radiance experts,
> I want to get the ground truth pixel values of a scene generated by
> radiance and I figured the best way is to use a uniform sky where the sky
> it's 1,1,1...everywhere. The way I'm currently using is by specifying a sun
> !gensky 4 1 12 +s -a 40 -o 98 -m 105
> skyfunc glow sky_glow
> 0
> 0
> 4 1 1 1 0
> sky_glow source sky
> 0
> 0
> 4 0 0 1 180
>
> This results in shadows in the final scene. I found that -u option or -c
> option can give me a uniform cloudy sky and maybe give me the ground truth
> values. I tried both of them but always get 'no lighting source warning'
> and a very dark scene when I try to use rpict and pfilt on the .oct
> generated. I think I might be understanding something wrong. Could you
> please give me a hint on this? The two options I tried are:
> !gensky 3 20 12 -a 40 -o 98 -m 105 -u -B 100
> and
> !gensky -ang 45 0 -c -b 1
>
> Thank you very much!
> Best,
> Vera
>
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