[Radiance-general] soft shadow

[Bei Xiao]

Hi,
   I used 4 area light sources to render a scene which include one glossy
object.
But the shadows in the scene are very harsh. I turned off the ambient
light.
My major parameters for rad commend are:
ps 3 -pt .08 -dp 512 -ar 101 -ms 0.71 -ds .2 -dj .5 -dt .1 -dc .5 -dr 1
-sj .7 -st .1 -ab 2 -aa .2 -ad 400 -as 64 -av 0.5 0.5 0.5 -lr 6 -lw .002
-aw 0 -av 0 0 0
  Are there ways that I could have softer shadows?

Thanks a lot.

Bei