Time for action – adjusting lightmaps on CSG surfaces

1. Go back into Lit mode and select the wall that has the blurry shadow on it. Open up the Surface Properties window by going to View | Surface Properties or by hitting F5.

2. We've covered most of these settings in an earlier tutorial, but let's look at the Lighting section, specifically the Lightmap Resolution parameter.

   

3. A setting of 32.0 means that there'll be one lightmap pixel every 32 units. If we want more detail (and we do!), we can make that number smaller. Set it to 4 and bake again. You'll notice that the bake takes much longer, but you've got a much more obvious shadow from the fire hydrant. If you try setting the resolution to 1, it may take over a minute to bake, but the results look even better.

   

4. Go back to the generic browser and find your map. You'll notice that some new lightmap textures have been created (and the old ones may still be hanging around too—UDK will clean those up later). If you look closely at your lightmap, you...