> 
> I have always taken  for granted that the official version of POV is flawless.

A dangerous assumption :)

  Anyway the behavior of layered textures is a matter of interpertation
rather than a flaw. Some argue that the way the official version works
is the correct behavior while others, like Nathan, argue that his version
is the correct behavior.

-- 
Ken Tyler - 1400+ POV-Ray, Graphics, 3D Rendering, and Raytracing Links:
http://home.pacbell.net/tylereng/index.html http://www.povray.org/links/

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