did you say you are using TWO cones in order to have a base texture and
another over it?  why not use a layered texture instead?  a wild stab
about your problem is that your outer cone is casting shadows on your
inner cone. that's just a guess though.

How Camp wrote:
> 
> I've got an odd situation:
> 
> I posted three images to p.b.i that will hopefully illustrate my problem.  I
> have a simple scene cosisting of two cones and a sphere.  One cone is used
> as a base texture, while the other is an image map (with a filtered color to
> allow the underlying texture to show through).  The image mapped cone is
> slightly larger than the base cone, to avoid any coincident surface
> problems.
> 
> Now, if I render the scene with a point light source, and all three objects
> are present, it looks as I would expect (first picture - the two cones are
> indistinguishable, as the filtered image map blends into the base texture).
> However, if I switch to an area light source, OR remove the sphere (or
> both), then suddently my base cone becomes dark, and only the filtered color
> on the image map appears correct (second and third picture - shows the image
> map and surrounding filtered area just as in the first example, but the base
> cone is much darker, making it obvious where the image map lies).
> 
> I've no idea why this is the case.  I played with the area light, and
> reduced it to a 1x1 source (which should look identical to a point source,
> correct?) and the strange difference is still apparent.  I can also change
> the sphere to other objects at other positions, and as long as something
> besides the two cones is present and I use a simple point source for the
> light, the image will render correctly (well, MY idea of correctly).
> 
> Anyone wish to explain this?  I'm apparently not so good with image maps...
> 
> - How

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