POV-Ray: Newsgroups: povray.newusers: How to get a texture like (y>0.8 & z>0.9) -> texture a else -> texture= b?: How to get a texture like (y>0.8 & z>0.9) -> texture a else -> texture= b?

POV-Ray : Newsgroups : povray.newusers : How to get a texture like (y>0.8 & z>0.9) -> texture a else -> texture= b? : How to get a texture like (y>0.8 & z>0.9) -> texture a else -> texture= b?		Server Time 30 Jul 2024 06:26:48 EDT (-0400)

From: D H Berlin
Date: 3 Sep 2004 11:25:01
Message: <web.41388c77579d5a0c43ad080a0@news.povray.org>

I hope the title says all :)

I have tried with a function and an declare:
#declare myfu =
 function(py,pz) {
  #if ((py>0.8) & (pz>1-0.1))
    1
  #else
    0
  #end
 };

#declare stufe_holz_metal =
    texture {
      function { myfu(y,z) }
      texture_map {
        [ 0.0 tex_a ]  // tex_a and tex_b are declared elsewhere
        [ 1 tex_b ]
      }
    };

But that doesn't work.

Greetgins
Dieter

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