I have been trying to lightmap my scene. It has a 3000x3000 completely flat terrain. The scene lightmaps very quickly when I turn the terrain off in lightmapping. As soon as I try to lightmap the scene with the terrain, it always takes an eternity on clustering, then once it finishes that it just gets stuck everytime on the 7/11 light transport. I've left it on for 40+ hours and it will not finish it. I have tweaked with the settings and tried everything, including making a scene from scratch,...
Lightmapping terrains... hopeless!
Lightmapping terrains... hopeless!