In TextureA below I have a texture_map based on a slope pattern. One of the 
textures in the texture_map has a normal{} entry.

Should this normal be taken into account when evaluating the slope? I don't 
know. What I do know is that sometimes it is and sometimes it isn't!

If an object is just textured with TextureA, then it isn't, but if an object 
is textured with TextureB, which has a texture_map with TextureA as an 
entry, then it is!

Can anybody explain which of the two is the correct behavior? I assume that 
one of them ought to be a bug. If not, then could somebody explain the logic 
behind this inconsistent behavior?


light_source {<0,1,-1>*1000, color 1}

#declare TextureA =
texture {
   slope y
   texture_map {
      [0.4 pigment {red   1}]
      [0.5 pigment {green 1} normal {spotted 5}]
      [0.6 pigment {blue  1}]
   }
}

#declare TextureB =
texture {
   spotted
   texture_map {[0,TextureA][1,TextureA]}
}

union {
   cylinder {-y, y, 1}
   sphere {-y, 1}
   sphere {y, 1}
   translate 5*z
   //texture {TextureA} // normal not used in slope
   texture {TextureB} // normal is used in slope
}


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