I am trying to play with TerrainToolkit, but it keeps freezing Unity. I have no idea what the problem is. All I know is no matter what settings I use, Unity still freezes. I am sure it has something to do with creating geometry.
I think when you put pixel error at 1 you are putting it in the wrong direction. Here is unity talking about pixel error
The accuracy of the mapping between the terrain maps (heightmap, textures, etc) and the generated terrain; higher values indicate lower accuracy but lower rendering overhead.
I usually just keep this at 8(i think this is default).
To test this also put the following on the following settings:
Detail Resolution: 64
Detail Resolution Per…: 8
Control Texture Resolution: 64
Base Texture Resolution: 64
Tree Distance: 1000
Test these settings out and see if you get your terrains to show up