In article <web.3dff7ff48a77e58da7778c0e0@news.povray.org>,
 "Renderdog" <slo### [at] hiwaaynet> wrote:

> I wanted to use a hollow transparent sphere to give some curvature
> to my leaf image map, and it works great except when the transparent
> part of the leaf's sphere intersects a (non-transparent) surface
> behind it. I get black pixels, like it's showing coincident surfaces,
> though the sphere's surface is transparent at that point.

If it is coincident with or intersects the surface, sometimes it will 
get hit first and the transmitted ray will miss the other surface, so 
you see the interior of the second object through the transparent one. 
Since the interior is in shadow, it is dark.

The only way to avoid this in the intersecting surface case would be to 
change the way POV handles non-refracting transparency.

-- 
Christopher James Huff <cja### [at] earthlinknet>
http://home.earthlink.net/~cjameshuff/
POV-Ray TAG: chr### [at] tagpovrayorg
http://tag.povray.org/

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