The blender quake 3 (.map) exporter works well with all sorts of meshes but terrain is the thing I strongly recommend it for.
What I did (blender)
1. Create a plane. Subdivide it few times.
2. With proportional editing on i move around a few points to make mountains. Sculpt mode is good for this also.
3. Convert quads to triangles.
4. Add and apply decimate modifier to decimate to an appropriate tricount (sweet!)
5. Select plane and Export .map
What I did (GTKradiant 1.5)
1. load map
2. box terrain in
3. create spawnpoint.
4. Used the replace texture feature to replace the blank texture/shader with sand.
5. Set all terrain to detail brushes or you get "MAX_MAP_VISIBILITY exceeded" in vis build process.
6. Build! (Took pretty long though.)
I think the final result and workflow was MUCH better than using gensurf or terragen. I STRONGLY recommend this approach over the use of patches.
What i can't decide is if this is better than importing a model. I'm leaning this way though.
