- Back in SketchUp, create a large square centered in the terrain but much bigger than the terrain.
- Push/Pull it upwards as you can see next. Delete the top face. Push/Pull the bottom face so that it sits below the terrain.
- Reverse the face so that the white (front) face is towards the inside.
- Import the background image as a texture, and click on the bottom left corner of one of the sides. Then, click on the other edge as you can see in the previous image.
- Sample the texture and paste on all three other faces.
- Find an interesting large scale texture and past it onto the bottom face.
- Select all four top edges and move them up or down to get the full height of the image in.
- You might have something like this. Save it and export to Unity:
Note
Trees and foliage are usually created within the game development environment, and Unity is no exception. Read all about the Unity Tree creator at http://unity3d.com/support/documentation/Components/class-Tree.html.
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