In article <3f8af8e2$1@news.povray.org>,
 "Scott Gammans" <dee### [at] yahoocom> wrote:

> You can't? That's not what I'm seeing. My fuselage has walls which are 0.1
> POV-Ray units thick. Image-mapped alpha transparency seems to work just
> fine... there's definitely a recessed, three-dimensional appearance to the
> windows, just like I had when I was differencing the holes out. By "thick
> walls" do you mean, for example, 1 POV-Ray unit thick on an box{5,-5} (i.e.,
> a wall with a thickness that is a significant % of the size of the object)?

If you take a closer look, you will see that the holes have no "sides". 
You are just making transparent areas in the skin of the object, the 
result will look like two thin layers. Irregular holes will look 
especially bad this way. And it does depend on thickness, but there 
isn't any simple relation, it depends highly on the situation. You will 
probably usually get away with it in paper-thin objects and other 
situations where you wouldn't see the sides of the hole.

-- 
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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