anchor.diff:                  let height =
                       match tileSetOpt with
                       | None -> 0.0f
  -                    | Some tileSet -> single (tile.Gid - tileSet.FirstGid) * 0.5f
  +                    | Some tileSet -> single (tile.Gid - tileSet.FirstGid) * heightScalar
                   let u = t * 6
  -                let position = v3 (single i) height (single j)
  +                let position = v3 (single i) height (single j) + offset
                   positions.[u] <- position
                   positions.[u+1] <- position + v3Right
                   positions.[u+2] <- position + v3Right + v3Forward
  
positive.code:         // create indices
          let indices = Array.init (tileMapWidth * tileMapHeight * 6) id
  
          // create bounds
          let bounds =
              box3
                  v3Zero
                  (v3 (single tileMapWidth) 16.0f (single tileMapHeight))
  
          // ensure we've found an albedo tile set
          match albedoTileSetOpt with
          | Some albedoTileSet ->
  
negative.code:                     [Entity.CubeMap == Assets.Default.SkyBoxMap]
                   Content.staticModelSurface Gen.name
                      [Entity.SurfaceIndex == 0
                       Entity.Size <== field --|> fun field world -> Triple.snd (Field.getFieldStaticModelAndSizeAndHeightMap field world)
                       Entity.StaticModel <== field --|> fun field world -> Triple.fst (Field.getFieldStaticModelAndSizeAndHeightMap field world)
                       Entity.RenderStyle == Forward 0.0f]
                   Content.staticModelSurface Gen.name
                      [Entity.SurfaceIndex == 1
                       Entity.Size <== field --|> fun field world -> Triple.snd (Field.getFieldStaticModelAndSizeAndHeightMap field world)
                       Entity.StaticModel <== field --|> fun field world -> Triple.fst (Field.getFieldStaticModelAndSizeAndHeightMap field world)
                       Entity.RenderStyle == Forward -1.0f]]]]
  
      override this.Register (game, world) =
  