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?

Also (and I almost hate to ask because it's probably in the dox), is it
possible to superimpose a bump_map on top of an "ordinary" normal, or
vice-versa? I wanted to create a "rough stone with some carvings" look
and this was the only way I could think of to do it without making
comprehensively large bump_maps...

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

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