https://player.vimeo.com/video/655326344?h=f36e130479&badge=0&autopause=0&player_id=0&app_id=58479

Without tfFold on the left and on the right tfFold is active.
There are two Mode settings: Fold Top, or Fold Bottom.
![tffold002[folddirection].png](https://s3-us-west-2.amazonaws.com/secure.notion-static.com/6b6da40d-a5bf-4163-95c6-97889534f49e/tffold002folddirection.png)
The Mode setting on the left is Fold Top. On the right, it is set to Fold Bottom.
Heightfield values that are above the Level setting will be folded down.