I have a simple scene with an interior with two rooms with a point light in each room. I have setup a second UV mapping and used the ‘Lightmap Pack’ option to generate the uv mapping. The attached image shows the output I am getting. I have no idea why it looks like this. Strangely, parts of it look ok. I built a simple scene with a plan and some cubes sitting on it with the default point light and that mapped fine. Any ideas? Thanks.