I have the following texture attached to a model:
texture{
  normal{ uv_mapping image_pattern{ jpeg "mask.jpg" interpolate 2}
    normal_map{
      [0.5 bump_map{ jpeg "bump.jpg" interpolate 2} scale 0.02]
      [0.5 bozo scale 0.02 bump_size 0.5]
    }
  }
}

Now the normals maps are scaled to 0.02, if I change the uv_mapping
image_pattern... to just image_pattern the normals maps are no longer 
the same scale.  I have to change the normal maps scales to 0.2 to make 
it match the uv mapped image pattern.  How is uv_mapping effecting the 
scale?

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