anchor.diff:              let uv = Flat.createFlippedUV 64 64 polygon
   
               let lightLevel = sector.LightLevel
  +            let lightLevel = lightLevel * lightLevel / 255
               let lightLevel =
                   if lightLevel > 255 then 255uy
                   else byte lightLevel
  
positive.code:                 let height = Array2D.length2 tex.Data
  
                  let lightLevel = sector.LightLevel
                  let lightLevel =
                      if lightLevel > 255 then 255uy
                      else byte lightLevel
  
negative.code:             let uv = Flat.createUV 64 64 polygon
  
              let lightLevel = sector.LightLevel
              let lightLevel = lightLevel * lightLevel / 255
              let lightLevel =
                  if lightLevel > 255 then 255uy
                  else byte lightLevel
  