If you have too much light hitting that back plane, it will drown out the
soft shadows.

Set the plane's ambient to 0 and diffuse to 1 in the finish{} block. Then
make sure your only light source is the area_light (if you want other light
sources on the text, put them in a light_group with the text). Set the
area_light's color to rgb 1, and if the direction to the area light from the
part of the plane we're looking at is about perpendicular to the plane, this
will cause a near perfect transition from white to black on the soft
shadows.

You may then want to raise ambient and decrease diffuse (keep them adding up
to 1 to keep the background white) to make the shadows lighter.

Also make sure you have circular and orient set in the area light.

 - Slime
 [ http://www.slimeland.com/ ]

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