Am 17.03.2018 um 15:39 schrieb Kenneth:

> 1)  the sphere for RADIOSITY lighting only:
>        no_shadow
>        no_image
>        no_reflection
>        finish{ emission *my choice*}  // to get the contrast I want
> 
> 2) the sphere for the VISIBLE sky image (and for reflections in objects):
>       no_shadow
>       no_radiosity
>       finish{emission 1.0} // for an accurate reproduction of the image_map, as
>      // seen in the render
> 
> This probably still amounts to 'tweaking'-- but unless there's a remaining
> technical problem, it works for me.

It remains tweaking indeed: This approach still breaks some (realistic)
brightness balance - namely that between radiosity and specular reflections.

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