How can i build cave? How can i textured all geometry brush?

In landscape if i press shift+LMB, the landscape above the brush down too. If i down the mountains and create geometry, it’s very buzy to clock on each poligon and change texture.Please, say, how can i do cave with landscape tools or how can i paint all geometry brush, not each poligon? And when will build stable editor? It’s crash every 5 minutes

Well, I do not know if you’ve answered this for yourself already,but I know of two, not very efficient ways, but they’ll yield results. I would recommend the first one, which essentially puts a hole in one landscape by removing visibility from a portion of it. The other, if you are making a whole cave level type thing, engrave the shape of the cave that you want into one landscape using sculpt, then copy it and transform it ( Mirror) on the z axis. Gives perfect alignment and mirror. Again, not exactly efficient, but yeilds results. The rest of this answer is in regards to making a material, painting it onto a landscape, and putting a hole in it..

The image is the landscape material I was taught, but the important peice to you in regards to your cave is the little box that says
“Landscape Visibility Mask”
Once you’ve made this (with whatever textures you choose) apply it to your desired landscape.
Then you’ve got to create a weighted layer. inside the paint tool, inside the landscape mode.

Now come the part that took me a week to find. The actual “making it vanish” part which many tutorials WILL NOT SHOW.

The above picture highlights the exact tool you should look for, and that will give you a hole (which may screw up the collision but thats partly a bug in the program and im still fairly new to this so there you go)