I tried this in the newusers group, but got one response from someone
who couldn't reproduce the effect, so...

The following brief scene:

camera
        {
        location  <0,6,-10>
        look_at   <0,5,0>
        }
        
light_source
        {
        <-350,1000,-250>
        color rgb <2,2,1.8>
        }
        
prism
        {
        conic_sweep
        linear_spline
        .5,1,5
        <4,8>,<-4,8>,<-4,-8>,<4,-8><4,8>
        rotate <180,0,0>
        translate <0,1,0>
        scale <1,32,1>
        translate <0,-11.5,5>
        pigment { color rgb <.5,.5,.5> }
        }

...is supposed to produce a tall, narrow, medium-gray truncated
pyramidal shape. It does in fact do this, but what has me confused is
the narrow dark band that appears on the left side of the front face. It
looks like a shadow, but there's nothing to cast one.

Any ideas?

-- 
Xplo Eristotle
http://start.at/xplosion/

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