1. I'm just wondering, how do I make bumpy surfaces? For my map, I'm trying make a mountain but I don't know how to make the surface a little bumpy. Can anyone help? I want to make it like the one in Karith station.
2. How do I make a sky brush?
3. Is there any possible way to add weather effects and sound?
4. How do I upload my own textures into GTK Radiant 1.5?