Le 23/03/2018 à 21:37, Sven Littkowski a écrit :
> A part of a superellipsoid shape is not covered bzy crand.
> 
> Please try the following code to reproduce the faulty crand display (I
> also used radiosity):
> 
> light_source
> {
>  < -300000.0, 100000.0, -300000.0 >
>  color rgb < 1.0, 0.949, 0.850 >
> }
> 
> camera
> {
>  location < -90.0, 20.0, -20.0 >
>  look_at < -55.0, 0.0, 0.0 >
> }
> 
> union
> {
>  superellipsoid
>  {
>   < 1.25, 0.25 >
>  }
>  texture
>  {
>   pigment { color rgb < 0.816, 0.752, 0.533 > }
>   finish { crand 0.75 }
>  }
>  translate < 0.0, 1.0, 0.0 >
>  scale < 0.5, 0.5, 0.5 >
>  rotate < 0.0, 90.0, 0.0 >
> }
> 
> ---
> Diese E-Mail wurde von AVG auf Viren geprüft.
> http://www.avg.com
> 

Which version of povray ?
I tried it on 3.7, adding the two extra lines at start:
#version 3.7;
global_settings{ assumed_gamma 1.0 }


I even added a sky_sphere to get a bit of background
sky_sphere{
  pigment { color srgb <0.6, 0.4, 0.2 >}
}

And from that point, I do not see your problem, after checking the
documentation:
The crand keyword can be added to a finish to cause a minor random
darkening in the diffuse reflection of direct illumination. Typical
values range from crand 0.01 to crand 0.5 or higher. The default value
is 0.

Darkening is happening.

The difference between a.png & b.png is commenting the finish.

Same shape, darkened with crand. Of course with a black background, some
part does not appear, black on black is hard to see from simple black.

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