[Radiance-general] confused by visual scene?

[Lars O. Grobe]

If you have indoor lighting, the light fall-off and, maybe, direction of
the light will underline geometry based on distance. Also objects will
create visible shades when between light and surfaces.

In your empty room, lid only by daylight (probably with a low -ab
setting and a set av-value, you did not tell us more about the
parameters you used), all surfaces will show the -av-preset brightness,
as they most probably do not receive direct light and the indirect is
not calculated. So it is hard to understand the interior, and there is
actually little calculation done.

Set -ab 2 and try again.

In general, for your questions, it is always important to post the whole
command line, e.g. rpict with all options and parameters! Without, we
are just guessing what you may have done.

CU Lars.