Render the scene below and compare with POV-Ray 3.1g, the results 
are very different. Replace the the marble by wood and the results are 
identical.

---%<------%<---
#version 3.5;
global_settings {assumed_gamma 1.0}
background {color rgb <0.5,0.5,1>}
camera {location  <0, 0.5, -2.0> look_at 0}
light_source {<500, 500, -500> rgb 1}
plane {y, -1 pigment {rgb <0.7,0.5,0.3>}}

sphere {
   0.0, 1
   texture {
      pigment {
         marble //wood
         turbulence <0.1,0.1,0>
         scale 0.1
         scale <2*pi,2*pi,1>
         colour_map {
            [0, rgbf 0]
            [1, rgbf <1,1,1,0.6>]
         }
      }
   }
}
---%<------%<---

PII 233 192MB NT4 SP6 POV-Ray 3.5-b7

Ingo

-- 
Photography: http://members.home.nl/ingoogni/
Pov-Ray    : http://members.home.nl/seed7/

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