Hi,

terrain tree?? Transparency?

Do you want to add a texture to a terrain, which uses an Alpha-Channel to mask the transparent parts?

Or do you rather intend to cut off the base of a terrain? If not visible, enable the according bracket-tool in the Terrain Editor (cf my screenshot, that Icon at "1") and then drag the lower bracket end upwards with your mouse (cf screenshot, at "2").

Hubert

 

"All that we see or fear, is but a Sphere inside a Sphere."     (E. A. Pryce -- Tuesday afternoon, 1845)