Setting imported model as terrain

I started creating levels for my game in blender so that I can create light maps and cast static shadows. My basic level set up is a plane that is subdivided many times, the way a terrain made in the SDK is. I also have some buildings and detail models on the ground. But because I UV map the terrain in blender, I can’t paint certain parts because it will affect other portions of the terrain using the same UV coordinates. Essentially, I want the SDK to recognize this plane as a terrain so that I can texture paint, allowing the light map with the shadows to still be seen. Is there any way I could go about doing this?

You will have to export a heightmap image and import that into the SDK’s terrain editor in order to use the terrain and painting tools it provides.
Terrain is a specific object in JME.

@Sploreg said: You will have to export a heightmap image and import that into the SDK's terrain editor in order to use the terrain and painting tools it provides. Terrain is a specific object in JME.
But if I create a heightmap how will I be able to apply the lightmap to it?

If you can render the lightmap to a texture, you should be able to apply it as one of the splat textures in the terrain material. It will only be valid if you do not modify the terrain height however.