I can only find this example that uses image textures. (water, grass & rock)

Forgive the crudeness of the scene, it's 3 years old, but here is a Bryce example of using 3 stacked terrains together with alphas to blend from one texture AND one terrain to the other.

Using 3 seperate terrains, still allows one to FULLY be able to edit the texture that is on each terrain.

AS

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