Op 29/09/2021 om 17:57 schreef Alain Martel:
> I do see a shadow to the right of the box. In fact, there are two, one 
> faint and soft, in line with the front face, and a darker and sharper 

> 
[snip]

Absolutely. Using Alain's settings for radiosity, and, instead of a 
skysphere:

   sphere {
     0, 10e5
     pigment{
         image_map {exr "lilienstein_4k.exr"
         map_type 1 interpolate 2 once}
     }
       finish {emission 2 diffuse 0}
}

and, adding micro-normals to the cube and the plane:

     normal {granite 0.2 scale 0.001}


I get the attached image.

Note that as the sunlight in the hdr/exr is rather diffuse, the shadows 
are also diffuse.

-- 
Thomas

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