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Ok.  My question is:  What value is your Force Extension set to and what are you hoping to achieve with Force Extension enabled?

Strata4: my value of ForceExtension in TerrainEditor is 1.0.
I hope to achieve a good "cut" result of the strata mountains, similar to terraces or plateaus. This because I want also export my terrain as mesh in 3dsMax, by baking polygons in Vue, and use this mesh to create a car simulation in Max with CraftDirectorStudio plugin.
I need to drive the car over the top of the flat mountains terraces, without holes.
If I make the baking of polygons and use the clipping-Max method instead of ForceExtension, in TerrainEditor, I can't achieve the "cut" of the mountains, because the mountains extend to all the height after exporting them.

I should also change something in the MaterialEditor?