anchor.diff:  #if DEBUG
           let population = 1
   #else
  -        let population = 50
  +        let population = 45
   #endif
  -        let spread = 20.0f
  +        let spread = 22.0f
           let offset = v3Dup spread * single population * 0.5f
           let positions = List ()
           for i in 0 .. population do
  
positive.code:         private
              { FieldTileMap : TileMap AssetTag }
  
      let getFieldHeightMapAndStaticModel (field : Field) world =
          let fieldModelAssetTag = asset field.FieldTileMap.PackageName (field.FieldTileMap.AssetName + "Model")
          match CachedDescriptors.TryGetValue fieldModelAssetTag with
          | (false, _) ->
  
negative.code:             World.enqueueRenderMessage3d (SetImageMinFilter (OpenGL.TextureMinFilter.NearestMipmapNearest, traversableSurfaceDescriptor.AlbedoImage)) world
              World.enqueueRenderMessage3d (SetImageMagFilter (OpenGL.TextureMagFilter.Nearest, traversableSurfaceDescriptor.AlbedoImage)) world
              CachedDescriptors.Add (fieldModelAssetTag, traversableHeightMap)
              (fieldModelAssetTag, traversableHeightMap)
          | (true, traversableHeightMap) -> (fieldModelAssetTag, traversableHeightMap)
  
      let make tileMap =
          { FieldTileMap = tileMap }
  