[Radiance-general] ambient light

[Christopher Rush]

When you say that you are rendering using only ambient light, do you
mean that there are no sources in your scene (no sky definition, no
surfaces with materials such as light, glow, source) and only the
contribution due to -av 0.02317? If so, your directionality might be due
to the ambient bounce, which is not uniformly distributing light because
of the one open side of the box. Try again with -ab 0 instead of -ab 1
and see if that gives what you had wanted. It seems you are only trying
to render a purely theoretical scene?

...

I am trying to render an image using only ambient light.  I noticed that
the reflected light appears to be non-uniform across the objects in the
scene.  The scene is a open box with the open part facing the viewer and
only surfaces inside the box are lit (outside of the box is dark).  It
appears that the light has some directionality to it.  I'm guessing that
there is a setting value that I have not appropriately set or something.
I wondered if anyone had an idea what might be problem. The rpict
parameters are listed as the following:

rpict -t 12 -vf view_files/rightview.vf -x 1600 -y 1600 -ps 3 -pt .08
-dp 512 -ar 48 -ms 0.71 -ds .2 -dj .5 -dt .1 -dc .5 -dr 1 -sj .7 -st .1
-ab 1 -aa .15 -ad 800 -as 128 -av 0.5 0.5 0.5 -lr 8 -lw .002 -dj 0.6 -dt
0.01 -dr 3 -ds 0.1 -sj 0.7 -st 0.15 -dc 0.5 -lr 1 -aw 0 -av 0.02317
0.02317 0.02317


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