This is actually much simpler:


#version 3.7;
global_settings { assumed_gamma 2.2 }

camera {
  perspective angle 75
  location  <0.0 , 1.0 ,-3.0>
  right     x*image_width/image_height
  look_at   <0.0 , 1.0 , 0.0>
}

light_source { <-3000,3000,-3000> color rgb 1.2 }

plane { y, 0
  pigment { checker srgb 1 srgb 0 }
}

sphere { y*1, 1
  pigment { color srgb <1,0.5,0> }
  finish {
    diffuse albedo 0.9
    specular albedo 0.1 roughness 0.05
  }
}


Note how the effective colour of the sphere is shifted in hue towards
yellow by the highlight, when it really should only be shifted in
saturation and brightness towards white.

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